Archived DAO Colloquium Schedules


Winter 2021

Tues January 19th, 11am, Zoom: Kim-Vy Tran (UNSW) Recording

MOSEL & ZFIRE : Tracking Galaxy Growth at Cosmic Noon: MOSEL and ZFIRE are deep near-IR spectroscopic surveys that track how galaxies assemble at 1.5<z<3.5. With MOSEL, we confirm a population of Extreme Emission Line Galaxies at z~3 with Oxygen equivalent widths >250 Angstroms and hypothesize that most galaxies at z>3 go through a strong starburst phase. We compare galaxy kinematics to IllustrisTNG to determine how massive galaxies at z~3 build their stellar mass (mostly by accreting other galaxies) and end their star formation (puffy galaxies quench slower). I also summarize results from our ZFIRE survey where we find faint imprints of environmental effects on the Inter-Stellar Medium of cluster galaxies at z~2.

Tues January 26th, 4pm***, ZoomTakuma Izumi (NAOJ)   Recording

ALMA observations of z > 6 low-luminosity quasars: unbiased view on the early co-evolution and feedback: I will review our multi-wavelength campaign observations toward z > 6 optically “low-luminosity” quasars, which were originally discovered by our wide-field Subaru Hyper Suprime-Cam (HSC) optical imaging survey. Our HSC quasars are an order of magnitude fainter at rest-UV than previously-known luminous quasars. Subsequent NIR spectroscopic follow-up observations revealed a wide spread in their BH mass, hence Eddington ratio (~0.1 to 1). We have also been carrying out a series of ALMA observations ([CII] line and FIR continuum emission) toward a sample of ~20 HSC quasars. We found that their host galaxies are basically FIR-faint with LIRG-class luminosities (or SFR < 100 Msun/yr). Using the [CII]-based dynamical mass as a surrogate for bulge stellar mass, we found that a significant fraction of these low-luminosity quasars are located on or even below the local co-evolution relation, indicating the BH-galaxy co-evolution is indeed taking place at z > 6. I also talk about a particular case of a z = 7.1 HSC quasar, where we found a vigorous starburst and, surprisingly, fast [CII] outflows. Given also its broad absorption line = BAL feature  (indication of nuclear outflow), quasar-driven feedback that affects the host galaxy occurred already at this reionization era.

Tues February 2nd, 11am, Zoom: Ilse Cleeves (U. of Virginia) Recording

The key role of astrochemistry in driving planet formation and habitability: Historically, our perspective on how planets form and obtain their compositions has been motivated by our Solar System. However, we are just one system, and missions like Kepler and TESS have revealed a variety of planetary types and architectures. How do we fit in? In the last five years, the Atacama Large Millimeter Array has revolutionized our understanding of planet formation by observing the process at high spatial resolution (reaching in some cases ~AU scales) matched with unprecedented sensitivity at radio wavelengths. In this presentation, I will review recent highlights from the TW Hya as a Chemical Rosetta Stone ALMA project and discuss how these findings both confirm and, in some ways, challenge our current picture of the chemistry of planet formation.

Tues February 16th, 11am, Zoom: Genaro Suarez (Western U.) Recording

An Accurate Look at the L-to-T Spectral Type Transition: I will present the most comprehensive spectral energy distribution (SED) of a young brown dwarf at the L/T transition by combining new Spitzer mid-infrared spectra and photometry with previous observations of HN Peg B. We use this SED to evaluate the performance of various atmospheric models and found that models with condensates and using non-equilibrium chemistry reproduce better the data. However, these models face challenges in reproducing the observed methane and carbon monoxide absorption strengths mainly over the 3–5 um region. By using the assembled SED and the Gaia EDR3 parallax of the host star, we derive accurate fundamental parameters of HN Peg B. We find that, in comparison to older early T dwarfs in the field, HN Peg B is ≈100 K cooler, has a ≈ 13% larger radius, and has a consistent bolometric luminosity. A comparison among moderate-dispersion near-infrared spectra of HN Peg B and other young and old dwarfs with similar spectra types shows that the 1.25-micron potassium line strengths are mostly insensitive to surface gravity in early-T dwarfs.

Tues February 23rd, 3pm***, ZoomEmily Wisnioski (ANU) Recording

The resolved dynamics and metallicity of galaxies across cosmic time: I will discuss the formation and evolutionary paths of star-forming galaxies. Kinematics and chemical properties have revealed that the majority of star-forming galaxies at ‘comic noon’ host thick disk-like structure and a turbulent less enriched interstellar medium. I will present results utilising synergies with multi-wavelength ground and space-based surveys to trace the evolution of spatially-resolved dynamics and star formation from a homogeneous sample over 5 billion years of cosmic history. These results when combined with local galactic archeology studies and new analytic models provide insights into how the structures of local galaxies including the Milky Way were formed. I will discuss the observational results within the framework of theoretical models for the formation of gas phase metallicity gradients and the local stellar age-velocity dispersion relation.

Tues March 9th, 11am,  Zoom: Laura Keating (AIP) Recording

Insights into the epoch of reionization from quasar absorption lines: The epoch of reionization marks the last major phase transition of the Universe, when photons emitted by the first structures ionized and heated the gas surrounding them. A complete understanding of reionization would reveal the properties of the first stars and galaxies, as well as increasing the precision to which the high-redshift intergalactic medium can be used to constrain cosmological parameters. In this talk I will demonstrate that the the pattern of absorption lines seen in distant quasars, known as the Lyman-alpha forest, is an ideal tool to study reionization. I will present results from cosmological radiative transfer simulations, which were carefully calibrated to reproduce the statistics of the Lyman-alpha forest, and will show that matching the observations requires reionization to have ended much later than previously thought.

Tues March 16th, 1pm***, Zoom: JJ Eldridge (U. Auckland) Recording

Some of the things binary stars do…. Most of the stars in the Universe are not single like our Sun but in binary stars systems. A binary star is composed of two stars in orbit around each other, as they age they can “get-in-each-others” way and experience very different evolution to that our stars like our Sun. Only over the last decade it has become clear that to accurately understand the Universe we need to take account of these interacting binary stars. In my talk I will go over a few examples showing how understanding binary stars allows us to understand the appearance of galaxies, the diversity of supernovae, the production of the most abundant and rarest elements and discuss the latest LIGO/VIRGO O3a results and their implications for binary evolution.

 

Fall 2020

Tues September 15th, 11am, Zoom: Silvia Toonen (U. of Birmingham) Recording

Stellar interactions and transients: In order to understand the Universe we live in, we must understand the diverse lives of stars, the fundamental building blocks of galaxies and stellar clusters. However, most stars do not evolve in isolation; they have one or more stellar companions that they can interact with. These interactions give rise to some of the most energetic events in the universe, e.g. stellar mergers, supernovae Type Ia explosions and gravitational wave sources. The last decade has revealed the existence of a large and diverse zoo of transients, but their origin or progenitor evolution is often unknown. In this talk I will show novel channels to induce stellar interactions and subsequent transients. I will present our latest results regarding the evolution of white dwarf binaries and their mergers, with implications for Galactic archaeology. Secondly, I will discuss how triple stars can evolve differently from binary stars, and show their potential as transient progenitors. While triple star systems are common, our understanding of their evolution has lagged behind compared to single and binary stars. I will conclude with revealing a new primary channel of binary evolution towards supernova type Ia events.

Tues September 22nd, 11am, Zoom: Fabio Pacucci (Harvard)  Recording

Detecting the Dawn of Black Holes: In this talk I discuss the quest to unravel two undetected populations of high-z black holes. The first population of black holes formed when the age of the Universe was less than 500 Myr, while by z=7 we have observations of fully-fledged, shining quasars. Shedding light on this cosmic period is one of the key tasks that the astronomical community will focus on in the next decade, due to its crucial importance for the early evolution of the Universe.The observational signatures of black hole seeds remain largely unexplored, and we are yet to detect these sources. I present detailed predictions for the spectra of different categories of seeds, and a photometric method to identify them in surveys. I explore the role that future facilities (e.g., JWST, Athena, Lynx, LISA) will play in this quest, by detecting both black hole accretion and mergers. To conclude, I show a detailed analysis of the requirements and the expectations for a comprehensive search of z > 10 black hole seeds. Moving at slightly lower redshifts, the discovery of the first strongly lensed quasar at z > 6 (J0439+1634, Fan et al. 2018) represents a breakthrough in our understanding of the early Universe. Pacucci & Loeb (2018) predict that the observed population of z > 6 quasars should contain many mildly magnified sources, with image separations below the resolution threshold. Additionally, current selection criteria should have missed a substantial population of lensed z > 6 quasars: WFIRST will likely play a crucial role in revealing this population. I estimate the fraction of undetected quasars as a function of the slope of the bright end of the quasar luminosity function. For steep values of this parameter, the vast majority of the z > 6 quasar population is lensed and still undetected. These “phantom quasars” would be misclassified and mixed up with low-z galaxies. I conclude by addressing how gravitational lensing can affect the inferred black hole mass distributions at z > 6, possibly having important implications for current theories of growth for early quasars.

Tues September 29th, 11am, Zoom: Benne Holwerda (U. of Louisville) Recording

A Search for High-Redshift Galaxies And An Accidental Galactic Survey of Dwarf Stars with Hubble: Current searches for high-redshift galaxies use a combination of near-infrared filters with one or more optical filters to check for contaminants. One of these contaminants are faint dwarf stars in the disk and halo of our own Milky Way Galaxy. Thus in the search for the galaxies that caused the Reionization of the Universe, an accidental census of Dwarf stars in the Milky Way was conducted as well. I report on one observational approach with the Hubble Space Telescope; the Brightest Origin of Reionizing Galaxies (BORG) survey. I will discuss the identification of the distant high-redshift galaxies, their unique properties, the faint brown and red dwarf stars (M-dwarfs) and our results on characterizing the shape of the Milky Way from their number. We identified stellar objects in the BoRG survey and mapped their distribution onto the Milky Way. Results are a thin disk (300pc), the rediscovery of the Sagittarius stream, a total count of 58 billion M-dwarfs in the Milky Way of which 7% reside in the halo. We also found a population of very bright, redshift eight galaxies (“Super-Eights”) that show evidence for strong nebular emission lines and direct observations of Lyman-alpha. The Super-Eights appear to reveal a very specific mode of star-formation that may have played a critical role in the Reionization of the Universe.

Tues October 6th, 11am, Zoom: Vivienne Baldassare (Washington State U.) Recording

Searching for active galactic nuclei in low-mass galaxies via optical variability:  The present-day population of supermassive black holes in low-mass galaxies offers a window into massive black hole formation in the early universe. While we cannot yet observe the formation of “black hole seeds” at high redshift, the fraction of small galaxies that host a supermassive black hole — and the properties of those black holes — are thought to depend on the mechanism by which these they form. However, black holes in the smallest galaxies can be difficult to find, requiring creative new approaches. I will discuss recent work showing that long-term optical photometric variability in low-mass galaxies can identify active galactic nuclei that are missed by other selection techniques. I will present an analysis of the nuclear variability of more than 70,000 nearby galaxies and discuss our sample of low-mass, variability-selected supermassive black holes. Using this sample, we are also able to place meaningful constraints on the present-day black hole occupation fraction at low galaxy stellar masses. 

Tues October 13th, 3pm***, Zoom: Madeline Marshall (HAA) Recording

The Host Galaxies of High-Redshift Quasars: Studying the host galaxies of high-redshift quasars provides vital insights into the early growth of supermassive black holes and the black hole—galaxy connection. Here I present an analysis of the properties and environments of the host galaxies of z=7 quasars from the BlueTides hydrodynamical simulation. I will also show our latest work using HST to obtain upper limits on the UV emission of z~6 quasar host galaxies. In combination, these two techniques will help to pave the way for making the first near-infrared detections of high-redshift quasar hosts with JWST.

Tues October 20th, 11am, Zoom: Greg Mosby (NASA) Recording

Estimating star formation histories from galaxy spectra and the path to life finding NIR detectors: The evolution of galaxies can be conveniently broken down into the evolution of their contents. We focus on the stellar content that can be observed, as the stars reflect information about the galaxy when they were formed. We approximate the stellar content and star formation histories of unresolved galaxies using stellar population modeling. We can use stellar population modeling of galaxies to test galaxy evolution and formation models. However, in the limit of low galaxy surface brightness, integrated spectra often have such low S/N that it hinders analysis with standard stellar population modeling techniques. To address this problem, we have developed a method that can recover galaxy star formation histories (SFHs) from rest frame optical spectra with S/N ~ 5 Å^-1 with a specific application to quasar host galaxies. We use the machine learning technique diffusion k-means to tailor the stellar population basis set, composed of 4 broad age bins, and it is successful in recovering a range of galaxy SFHs. Our method has the advantage in recovering information from quasar host galaxies and could also be applied to the analysis of other low S/N galaxy spectra such as that typically obtained for high redshift objects and integral field spectroscopic surveys. I have now begun using diffusion k-means to generate a multi-metallicity basis set to estimate the stellar mass and chemical evolution of unresolved galaxies. In addition, I have begun work to fully characterizing today’s HgCdTe photodiode arrays to lay the foundation for future near infrared detector development. Low read noise and well-characterized detectors are crucial in the emerging search for biosignatures in exoplanet atmospheres.

Tues October 27th, 11am, Zoom: Monika Soraisam (U. of Illinois at Urbana-Champaign) Recording

Big-Data Rush: Mining Time-Domain Data of Local Stellar Populations: With several large-scale sky surveys ongoing and recently completed, the era of Big Data has dawned on optical time-domain astronomy. Abundant archival data provide an opportunity to perform systematic studies of stellar variability in nearby galaxies, and thereby yield constraints on the effect of environmental factors, such as metallicity. I will present results from mining the data from the Palomar Transient Factory survey for photometric variability of luminous stars in the Andromeda Galaxy. On the other hand, the enormous volume and rate of data bring their own challenges for real-time applications. I will highlight recent progress in the development of infrastructure and analysis tools to tackle those challenges, with a focus on event-broker systems (e.g., ANTARES), which allow timely discovery and characterization of interesting short-lived astrophysical events by automatically triaging the overwhelming time-domain alert-data. As part of the broker, an efficient and effective algorithm for selecting rare and novel events is crucial in the big-data era. I will briefly describe such an algorithm I have designed in preparation for VRO/LSST alerts.

Tues November 17th, 11am, Zoom: Davide Farnocchia (JPL/CalTech) Recording Unavailable

OSIRIS-REx and impact hazard assessment for asteroid (101955) Bennu: The OSIRIS-REx mission is part of NASA’s New Frontiers Program and is the first U.S. mission to retrieve a sample of an asteroid and carry it to Earth for further study. The target of OSIRIS-REx (101955) Bennu, a 500 m near-Earth asteroid that is expected to have organic compounds and water-bearing materials. OSIRIS-REx launched in September 2016 and rendezvoused with Bennu in late 2018. After two years of proximity operations, on 2020 October 20 OSIRIS-REx successfully executed the sample collection sequence and is now preparing for the return cruise to Earth to deploy the sample in 2023. In this talk, I will present the current status of the mission, highlighting some the main challenges faced by the mission and the most relevant scientific results. In particular, I will focus on the impact hazard problem. Bennu is a potentially hazardous asteroid and its trajectory is deterministic until the close approach with Earth in 2135. After this encounter, the orbital uncertainty of Bennu increases to a level that its trajectory can only be analyzed in a statistical sense, and impacts with Earth cannot be ruled out in the second part of the next century. Key to the modeling of Bennu’s trajectory is the Yarkovsky effect, a subtle nongravitational perturbation due to non-isotropic thermal radiation that causes a semimajor axis drift. The OSIRIS-REx tracking data provide useful constraints on this perturbation and on the Bennu hazard assessment.

Tues November 24th, 11am, Zoom: Ian Roederer (U. of Michigan) Recording

The astrophysical r-process: what we are learning from gravitational waves, dwarf galaxies, and stellar archaeology: Understanding the origin of the elements is one of the major challenges of modern astrophysics. The rapid neutron-capture process, or r-process, is one of the fundamental ways that stars produce the heaviest elements, but key aspects of the r-process are still poorly understood. I will describe four major advances in the last few years that have succeeded in confirming neutron star mergers as an important but perhaps not exclusive site of the r-process. These include the detection of freshly produced r-process material powering the kilonova associated with the merger of neutron stars detected via gravitational waves (GW170817), the identification of a dwarf galaxy where most of the stars are highly enhanced in r-process elements (Reticulum II), new connections between the r-process and its Galactic environment (thanks to data from the Gaia satellite), and advances in deriving abundances of previously-undetected r-process elements (such as Se, Te, Pt) in ultraviolet spectra of metal-poor stars. I will highlight opportunities to connect these research directions with future facilities (like FRIB, CETUS, and HabEx) to associate specific physics with specific sites of the r-process.

Tues December 1st, 11am, Zoom: Feige Wang (U. of Arizona)  Recording

Exploring Reionization-Era Quasars: The most distant luminous quasars provide unique probes to the formation of the earliest supermassive black holes (SMBHs), the assembly of massive galaxies and the reionization of intergalactic medium. In this talk, I will review the ongoing quasar surveys which yield a sizable sample of quasars at redshift z~7 and several luminous quasars at redshift beyond 7.5, deep into the epoch of reionization. These quasar surveys allow the first measurement of quasar luminosity function and the characterization of quasar evolution in the reionization-era. The existence of billion solar mass black holes at redshift beyond 7.5 posts stringent constraints on the theory of black hole formation and growth in the early Universe. I will also present the on-going projects for investigating quasar host galaxies using high resolution ALMA observations and studying the large-scale environment of the earliest SMBHs with deep wide field imaging.
 

Tues December 8th, 11am, Zoom: Stanimir Metchev (Western U.) Recording

Micro- and nano-satellites offer cost-effective platforms for space technology development and for targeted investigations in astronomy: As demonstrated by MOST and BRITE, time-domain photometry of bright objects, such as Milky Way stars and planetary systems, can be well-served by their modest apertures. Improving detector technology is now opening small-sat platforms to fainter extragalactic objects, to non-optical wavelengths, to multi-band photometry, low-resolution spectroscopy, and polarimetry. Two novel opportunities have been explored through recent studies for the CSA. The Photometric Observations of Extrasolar Planets (POEP) mission aims for dedicated UV and near-IR capability on a 15 cm telescope to characterize atmospheric scattering in exoplanetary atmospheres and to detect Earth-sized planets around red dwarfs. POEP has been endorsed as a highly-ranked LRP2020 space astronomy priority in the <$25M category, behind only continued support for JWST. The Extrasolar Planet Polarimetry Explorer (ÉPPÉ) aims to be the first space mission designed specifically for precision polarimetry. Differential polarimetric observations with ÉPPÉ would be sensitive to tenuous amounts of atmosphere on known exoplanets, and in particular to highly-polarizing volatiles, such as water, methane, etc. Both POEP and ÉPPÉ would offer unique capabilities that would complement well the suite of large space telescopes anticipated at the end of this decade. Given Canada’s astronomy small sat heritage, it is in a strong position to lead these new developments.

 

Summer 2020

Tues May 12th, 11am, Zoom: Evelyn Johnston (Universidad Católica)                  

Tues May 19th, 11am, Zoom: Paul Wiegert (Western University)

Tues June 2nd, 11am, Zoom: Decker French  (Carnegie Observatories),  Recording

Tues June 9th, 11am, Zoom: Raja GuhaThakurta (Santa Cruz/Lick Obs.), Recording

Tues June 16th, 11am, Zoom: Peter Brown (Western University), Recording

Tues June 23rd, 11am, Zoom: Ylva Gotberg (Carnegie Observatories), Recording

Tues June 30th, 4pm**, Zoom: Daniel Price (Monash University), Recording

Tues July 7th, 11am, ZoomMeg Schwamb (Queen’s U Belfast), Recording

Tues July 14th, 11am, Zoom: Jan Cami (Western University), Recording

 

Winter 2020

Tues January 14th, 11am, LCR: Marcin Sawicki (St Mary/HAA)                            

Tues January 21th, 11am, LCR: Jay Melosh (Perdue University)

Tues February 4th, 3pm, LCR: David Hendel  (University of Toronto)

Tues February 11th, 11am, LCR: Brian Svaboda (NRAO New Mexico)

Tues February 18th, 11am, LCR: Sarah Sadavoy (Queens University)

Tues February 25th, 11am, LCR: Gijs Mulders (University of Chicago)

Tues March 3rd, 11am, LCRIlse Cleeves (University of Virginia) Cancelled/Postponed due to travel restrictions

Tues March 10th, 11am, LCR:  Daryl Haggard (McGill University)

Tues March 17th, 11am, LCR: Greg Mosby (NASA Goddard) Cancelled/Postponed due to travel restrictions

Tues March 24th, 11am, LCR: Fabio Pacucci (CfA/Harvard) Cancelled/Postponed due to travel restrictions

Tues March 31th, 11am, LCR: Mehrnoosh Tahani (DRAO) Cancelled/Postponed due to travel restrictions

 

Fall 2019

Tues September 17th, Todd Henry (Georgia State University)

Tues September 24th, Eve Lee (McGill)

Mon October 7th, Satoshi Yamamoto (University of Tokyo)

Tues October 15th Gwendolyn Eadie (University of Toronto)

Tues October 22ndTyrone Woods (HAA)

Tues October 29th, Isabel Santos-Santon (Univeristy of Victoria)

Tues November 5th, Library: Sarah Pearson (Flatiron institute)

Tues November 19th, Jennifer Marshall (MSE)

Tues November 26th, Brian Mason (Georgia State University)

Tues December 3th, Allison Man (Dunlap Institute)

Tues December 10th, Raphaël Errani (University of Victoria/CITA)

 

Spring 2019

Date Speaker Title / Topic (Click for poster/abstract)
Tues Jan 8 No seminar (AAS week)
Tues Jan 15 Hope How-Huan Chen (UT Austin) Coherent Structures and Star Formation: An Updated Story of Islands of Calmness in a Sea of Turbulence
Tues Jan 22 Renee Hlozek (Toronto) The Photometric LSST Astronomical Time Series Classification Challenge
Tues Jan 29 Andrew Cumming (McGill) Formation and evolution of gas giant planets and exoplanets
Tues Feb 5 Robyn Sanderson (UPenn) Insights into dark matter from the stellar halos of galaxies
Tues Feb 12 Seminar cancelled due to weather.
Tues Feb 19 Seminar cancelled.
**Thurs Feb 21** Rory Barnes (U. Washington) After the Habitable Zone
Tues Feb 26 Laura Fissel (NRAO) Studying star formation from the stratosphere
Tues Mar 5 Sam Lawler (NRC/DAO) Discoveries and Observation Biases in the Outer Solar System: Don’t Count Your Planets Before They Hatch
Tues Mar 12 Angie Wolfgang (Penn State) What’s Next for Super-Earths? Population Demographics To Probabilistic Planetary Physics
Tues Mar 19 John Tobin (NRAO) Revolutionizing our View of Disk and Multiple Star Formation: New Frontiers Explored by ALMA and the VLA
**Wed Mar 20** Yuan-Sen Ting (Princeton) Milky Way, machine learning, big data
Tues Mar 26 Will Percival (Waterloo) Making cosmological measurements with standard rulers and standard shapes
Tues Apr 2 Ruobing Dong (UVic) Observational planet formation
Tues Apr 9 Wes Fraser (NRC)  
Tues Apr 16 No seminar
Tues Apr 23 Abedin Abedin (NRC)  
Tues Apr 30 TBD  

Fall 2018

Date Speaker Title / Topic (Click for poster/abstract)
Tues Sep 11 Eric Murphy (NRAO Charlottesville)  A next generation Very Large Array
Tues Sep 18 Jean-Luc Margot (UCLA)  Probing planetary interior structure and processes with high-precision rotation measurements
Tues Sep 25 Beth Willman (AURA)  Near-Field Cosmology with Local Volume LMC Stellar-Mass Galaxies
**Thurs Sep 27** (3pm) Andrea Bellini (STScI)  Globular clusters: multiple stellar populations and internal kinematics
**Fri Sep 28** Else Starkenburg (AIP; Leibniz
Institute for Astrophysics)
 Observing the Pristine Galaxy
Tues Oct 2 Holger Baumgardt (U. Queensland)  Searching for the smallest-mass supermassive black holes
Tues Oct 9 Robert Andrassy (U. Victoria)  3D convection in massive stars: From the main sequence to core collapse
Tues Oct 16 Toby Brown (McMaster)  The Life Cycle of Nearby Galaxies: internal and external processes regulating their gas content
Tues Oct 23 Jessie Christiansen (NExScI / Caltech)  Ten Thousand Pieces of Blue Sky: Building towards the complete picture of exoplanet demographics
Tues Oct 30 Marcel Pawlowski (UC Irvine)  Dark Matter and the Dance of Dwarf Galaxies
Tues Nov 6 Nina Hernitschek (Caltech)  A Machine-Learning View of our Milky Way
Tues Nov 13 Sungsoon Lim (HAA)  Ultra-Diffuse Galaxies and Their Origins
Tues Nov 20 Megan Ansdell (UC Berkeley)  Things that go “dip” in the night: from disintegrating planets to alien megastructures
Tues Nov 27 Michael Cushing (Toledo)  Hunting for Cool Brown Dwarfs with WISE
Tues Dec 4 Kevin France (CU Boulder)  Ultraviolet Spectroscopy from Suborbital and SmallSat Platforms: Little NASA Missions Supporting Big NASA Observatories and Bigger Science
** Wed Dec 19, 11 am ** Nathalie Ouellette (iREx / U. Montréal)  Disentangling Scaling Relations in the Virgo Cluster

Spring 2018

Date Speaker Title / Topic (Click for poster/abstract)
Tues Jan 9 Nienke van der Marel (NRC/DAO) “The ALMA revolution of planet formation: structures of gas and dust in planet-forming disks”
Tues Jan 16 Rebecca Jensen-Clem (UC Berkeley) “Probing the atmospheres of exoplanets and brown dwarfs with near-IR polarimetry”
Tues Jan 23 Alex Hill (UBC/DRAO)  “Ionization of the warm (magneto)ionized medium”
Tues Jan 30 Adrian Price-Whelan (Princeton)  “Very wide binaries and comoving stars in the Gaia era”
Tues Feb 6 Jocelyn Read (Cal State Fullerton)  “Measuring the neutron-star equation of state with GW170817”
Tues Feb 13 Reka Winslow (U. New Hampshire) “Coronal mass ejection evolution and effects on galactic cosmic rays and planetary magnetospheres”
Tues Feb 20 Leslie Rogers (U. Chicago)  “The diversity and demographics of distant rocky worlds”
Tues Feb 27 Kelsi Singer (SwRI)  “From craters to cyrovolcanoes—Recent results from the New Horizons mission to Pluto and the Kuiper Belt”
Tues Mar 6 Evan Scannapieco (ASU)  “The rise and fall of galaxies”
Tues Mar 13 Tessa Vernstrom (Dunlap)  “The faint extragalactic radio background”
Tues Mar 20 Brenda Matthews (NRC/DAO)  “Debris disks and their connection to planets: Surveys and resolved imaging”
Tues Mar 27 Louise Edwards (Cal Poly SLO)  “Today’s largest galaxies: Examining the growth of local brightest cluster galaxies using IFU kinematics and stellar populations”
Tues Apr 3 Vincent Henault-Brunet (NRC/DAO)  “Mass modelling globular clusters: from black holes to low-mass stars”
Tues Apr 10 Guillaume Thomas (NRC/DAO)  “Testing the dark matter and alternative gravity theories with the stellar streams of the Milky Way”
Tues Apr 17 Lisa Locke (NRC/DAO)  “Phased Array Feeds etc.: Musings from the mm Instrumentation Group”

Fall 2017

Date Speaker Title / Topic
Tues. Sep. 5 Henry Ngo (NRC/DAO) “Planet Formation and Migration in Extreme Planetary Systems”
Tues. Sep. 12 Jessica Werk (UW) “Circumgalactic Matter Matters”
Tues. Sep. 19 Dan Werthimer (UC Berkeley/SETI) “Is Anyone Out There? SETI@home and the Breakthrough Listen Project”
Tues. Sep. 26 Yashar Hezaveh (Stanford) “The Future of Mapping Dark Matter Structures with Strong Gravitational Lensing, New Surveys, and Machine Learning”
Tues. Oct. 3 Yancy Shirley (U. Arizona) “Studying the Earliest Phase of Massive Star and Cluster Formation – the Properties of Massive Starless Clump Candidates in the Milky Way”
Tues. Oct. 10 *** No seminar *** *** No seminar ***
Tues. Oct. 17 Hannah Jang-Condell (U. Wyoming) “From Protoplanetary Disks to Exoplanets: How Do Planets Form and Evolve?”
Tues. Oct. 24 Karin Sandstrom (UC San Diego) “Interstellar Dust at Low Metallicity”
Tues. Oct. 31 Charli Sakari (UW) “Unraveling the Chemical Evolution of Galaxies Beyond the Milky Way with Integrated Light Spectroscopy of Globular Clusters”
Tues. Nov. 7 Courtney Dressing (UC Berkeley) “Exploring Planetary Systems Orbiting Cool Dwarfs”
Tues. Nov. 14 Alessandro Boselli (LAM) “The role of the environment on galaxy evolution and the VESTIGE survey”
Tues. Nov. 21 Bruce Macintosh (Stanford) “The Gemini Planet Imager”
Tues. Nov. 28 Kevin Covey (Western Washington) “Surveying the kinematics, multiplicity, and star formation histories of low-mass stars & Milky Way clusters with APOGEE”

Spring 2017

Date Speaker
Jan 10 Gary Mamon (IAP)
Jan 17 Alina Kiessling (JPL)
Jan 24 Chris Pritchet (UVic)
Jan 31 Cameron Yozin (UVic) ** cancelled **
Feb 7 Karin Sandstrom (UC San Diego)
Feb 14 Erik Rosolowsky (U. Alberta)
Feb 21 Ian Shelton (Mount Allison)
Feb 28 Marc Buie (SwRI)
Mar 7 Sean Couch (Michigan State)
Mar 14 Catherine Espaillat (Boston)
Mar 21 Jessica Werk (UW)
Mar 28 Tim Davidge (NRC/DAO)
Apr 4 Matthew Payne (CfA/Harvard)
Apr 11 Jaime Pineda (MPE)
Apr 18 Dan Weisz (UC Berkeley)
Apr 25 Renu Malhotra (U. Arizona)

Fall 2016

Date Speaker
Sep 06 Gwen Eadie (McMaster)
Sep 13 Matthew Taylor (Universidad Catolica)
Sep 20 Quinn Konopacky (UC San Diego)
Sep 27 Lucas Macri (Texas A&M)
Oct 04 Jo Bovy (Toronto)
Oct 11 Keith Vanderlinde (Dunlap)
Oct 18 Tuan Do (UCLA)
Oct 25 Sean Andrews (CfA/Smithsonian)
Nov 01 Marta Volonteri (IAP) ** cancelled **
Nov 08 Daniel Tamayo (Toronto)
Nov 15 Adam Ginsburg (NRAO)
Nov 22 Benoit Cote (UVic) ** cancelled **
Nov 29 Katherine Kretke (SwRI)
Dec 06 Meredith Rawls (UW)
Dec 13 Paul Scholz (NRC/DRAO)

Spring 2016

Date Speaker
Jan 19 Karin Oberg (CfA)
Jan 26 Etsuko Mieda (NRC/DAO)
Feb 02 Nitya Kalliayalil (U. Virginia)
Feb 09 Richard Shaw (UBC)
Feb 16 David Nesvorny (SwRI)
Feb 23 Julie Hlavacek-Larrondo (UdM)
Mar 01 Cara Battersby (CfA)
Mar 08 Laura Sales (UC Riverside)
Mar 15 Michael Cooper (UC Irvine)
Mar 22 Betsy Mills (U. Arizona)
Mar 29 Emily Levesque (UW)
Apr 05 Will Grundy (Lowell)
Apr 12 Brett Gladman (UBC)
Apr 19 Linda Strubbe (UBC)
Apr 26 Anil Seth (U. Utah)
May 03 David Reitze (Caltech)
May 24 Sun Kwok (Hong Kong)

Fall 2015

Date Speaker
Sep 15 Mary Beth Laychak (CFHT)
Sep 17 Melissa Graham (UC Berkeley)
Sep 22 Dennis Crabtree (NRC/DAO)
Sep 29 Dustin Lang (CMU/Waterloo)
Oct 06 Elisabeth Mills (NRAO)
Oct 13 Roberto Abraham (Toronto)
Oct 20 David Gerdes (U. Michigan)
Oct 27 Ruth Murray-Clay (UC Santa Barbara)
Nov 03 Andrew Connolly (UW)
Nov 10 Jake Vanderplas (UW)
Nov 17 Jeffrey Fung (UC Berkeley)
Nov 24 Nicholas McConnell (NRC/DAO)
Dec 01 Gurtina Besla (U. Arizona)
Dec 08 Sarah Martell (UNSW)

Spring 2015

Date Speaker
Jan 27 Mark Krumholz (UCSC)
Feb 03 Jessica Lu (IfA)
Feb 10 Josh Eisner (U. Arizona)
Feb 17 Aaron Boley (UBC)
Feb 24 Michael Rupen (NRC/DAO) ** cancelled **
Mar 03 Scott Chapman (Dalhousie)
Mar 09 Joe Masiero (JPL)
Mar 17 Meredith Hughes (Wesleyan)
Mar 24 Paul Schechter (MIT)
Mar 31 Lynne Hillenbrand (Caltech)
Apr 07 Mariska Kriek (UC Berkeley)
Apr 14 Kaitlin Kratter (U. Arizona)
Apr 21 Karun Thanjavur (UVic)
Apr 28 Chat Hull (CfA)

Fall 2014

Date Speaker
Sep 02 Elisa Toloba (UCO/Lick)
Sep 03 Guillermo Barro (UCO/Lick)
Sep 09 Luca Ricci (Caltech)
Sep 16
Sep 23 Eric Ford (Penn State)
Sep 30 Luc Simard (NRC/DAO)
Oct 09 Steve Majewski (U. Virginia)
Oct 14 Jon Swift (Caltech)
Oct 21 Luke Dones (SwRI)
Oct 23 Herzberg Jamboree
Oct 28
Nov 04 Florian Beutler (LBNL)
Nov 11 No seminar scheduled (holiday)
Nov 18 Alis Deason (UCO/Lick)
Nov 20 Shep Doeleman (MIT Haystack)
Nov 25 Claire Chandler (NRAO)
Dec 02 Rachel Friesen (Dunlap)
Dec 09 Kristine Spekkens (Queen’s)
Dec 15 cancelled

Spring 2014

Date Speaker
Jan 14 Arianna Di Cintio
Jan 21 John Wise
Jan 28 Alyson Brooks
Feb 04 Mike Landry
Feb 11 Rita Mann (NRC/DAO)
Feb 18 Luisa Rebull
Feb 25 Chris Friar
Mar 04 Christine Wilson (McMaster)
Mar 11 Rachel Mason
Mar 18 Juan Collar
Mar 25 Sam Lawler (NRC/DAO)
Apr 01 Karun Thanjavur (UVic)
Apr 15 Rachel Mason
Apr 17 Nienke van der Marel
Apr 22 Scott Sheppard
May 06 Philip Kronberg
May 20 Kevin Steels

Fall 2013

Sep 17   Chris Stubbs
Sep 24   Hilke Schlichting
Oct 01   Donald Morton
Oct 08   Helen Kirk (NRC/DAO)
Oct 17   James Bullock (UC Irvine)
Oct 22   Riccardo Giovanelli
Oct 29   Ruben Sanchez-Janssen (NRC/DAO)
Nov 05   Michele Bannister (UVic)
Nov 12   Katherine Alatalo
Nov 19   Nitya Kallivayalil ** cancelled **
Nov 26   Diana Dragomir
Dec 03   Andy Becker
Dec 10   Inger Jorgensen

Spring 2013

Jan 29   Asa Bluck (UVic)
Feb 05   Miguel Morales
Feb 12   Jorge Moreno (UVic)
Feb 19   Erin Bonning
Feb 26   Jonathan Williams
Mar 05   Mike Boylan-Kolchin
Mar 12   Alex Kim
Mar 21   Tony Tyson
Mar 26   David Wilner
Apr 09   Joern Geisbeusch
Apr 16   Wes Traub
Apr 23   Paul Kalas
Apr 25   Yin-Zhe MA
Apr 30   Graca Roca
May 14   Brian McNamara (U. Waterloo)
May 21   Mubdi Rahman

Fall 2012

Aug 28   Andrea Kunder (CTIO)
Sep 04   Jennifer Karr (ASIAA) / Hiro Takami (ASIAA)
Sep 11   No Seminar Scheduled
Sep 18   Nicholas Ball (NRC/DAO)
Sep 25   Chris Reynolds (U. Maryland)
Oct 02   Ben Mazin (UC Santa Barbera)
Oct 09   Matthijs van der Wiel (U. Lethbridge)
Oct 16   Charlie Conroy (UC Santa Cruz)
Oct 23   Sarah Ballard (UW)
Oct 30   Susan Terebey (California State)
Nov 07   Shelley Wright (Dunlap)
Nov 13   Wesley Traub (JPL)
Nov 20   Norman Murray (CITA)
Nov 27   Tim Beers (NOAO)
Dec 04   Tim Robishaw (NRC/DRAO)

Spring 2012

Jan 17   David Tsang (Caltech)
Jan 24   Else Starkenburg (UVic)
Jan 31   Tommaso Treu (UC Santa Barbara)
Feb 07   Federica Bianco (LCOGT)
Feb 14   No Seminar Scheduled
Feb 23   Crystal Martin (UC Santa Barbara)
Feb 28   Scott Schnee (NRAO)
Mar 06   Trevor Mendel (UVic)
Mar 14   Stephen Kane (Caltech)
Mar 22   Peter Yoachim (UW)
Mar 27   Martin Bureau (U. Oxford)
Apr 03   Lynne Jones (UW)
Apr 10   Wes Fraser (NRC/DAO)
Apr 17   John Tobin (NRAO)
Apr 24   James Graham (Dunlap)
May 11   Faith Vilas (U. Arizona)
Jun 11   Giuseppina Battaglia (ESO/INAF)
Jun 14   Jeremy Mould (NOAO)

Fall 2011

Sep 13   Sarah Loebman (UW)
Sep 20   Bob Rood (U. Virginia)
Sep 27   Kate Su (Steward)
Oct 04   Sarah Brough (AAO)
Oct 05   Gary Sanders (TMT Project Manager)
Oct 11   Uma Gorti (SETI)
Oct 17   James Truran (U. Chicago) ** cancelled **
Oct 18   Henrik Beuther (MPIA)
Oct 25   Gregory Sivakoff (U. Alberta)
Nov 01   Steven Allen (Stanford)
Nov 08   Ray Jayawardhana (U. Toronto) ** cancelled **
Nov 15   Pascale Jablonka (EPFL / Observatoire de Paris)
Nov 22   Gunther Hasinger (IfA)
Nov 29   Andrew Youdin (CfA)
Dec 06   Beth Willman (Haverford)
Dec 13   Chung-Pei Ma (UC Berkeley)

Spring 2011

Jan 05   Preethi Nair (U. Toronto/INAF)
Jan 17   Danilo Marchesini (Tufts)
Jan 26   Evgenya Shkolnik (DTM)
Feb 01   Charles Lawrence (JPL)
Feb 08   Cassie Fallscheer (UVic/NRC)
Feb 15   Rita Mann (NRC/DAO)
Feb 22   Ingrid Stairs (UBC)
Mar 08   Matt Walker (CfA)
Mar 15   Ata Sarajedini (U. Florida)
Mar 22   Sean M. Andrews (CfA)
Apr 05   John Dubinski (U. Toronto)
Apr 12   Eric Bell (U. Michigan)
Apr 19   Jon Willis (UVic)
Apr 26   John Carpenter (Caltech)
May 03   Bill McKinnon (St. Louis)
May 10   Richard de Grijs (UPeking/KIAA)

Fall 2010

Sep 14   Emily Schaller (U. Arizona)
Sep 20   Hendrik Hildebrandt (UBC)
Sep 21   Carol Lonsdale & Mark McKinnon (ALMA)
Sep 28   David Jewitt (UCLA)
Oct 05   Meridith Hughes (UC Berkeley)
Oct 07   Ricardo Munoz (Yale)
Oct 12   Mark Booth (Cambridge/DAO)
Oct 19   Jason Rowe (NASA Ames)
Oct 26   Andrew Benson (Caltech)
Nov 02   Lee Hartmann (U. Michigan)
Nov 09   Michele Cantiello (INAF)
Nov 16   No Seminar Schedule (CFHT Users Meeting in Taipei)
Nov 23   Guy Worthey (WSU)
Nov 30   Lisa Kewley (U. Hawaii)
Dec 07   Kristin Woodley (UBC)
Dec 09   James Di Francesco (NRC/DAO)
Dec 14   Sean Dougherty (NRC/DRAO)