Colloquia Schedule Fall 2014
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
"Hot Chromospheres and Flares on Cool and Ultracool Dwarfs" Ohio State University host: Adam Kraus |
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"Let it Collide: An Epic Saga of Star Wars Planets, Planetesimals, and Super Planet Crashes" University of Texas at Austin host: Adam Kraus |
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"The Complex Interplay between Star Formation and Galaxy Evolution from z~0-6" Haverford College host: Steve Finkelstein |
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"Compact Galaxies and Super-Massive Black Holes" Max Planck Institute for Astronomy (MPIA), Heidelberg host: Karl Gebhardt |
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"The Architecture and Timing of Planetary Systems" University of Chicago host: TBD |
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"Who's Afraid of the Big Bad Supermassive Black Hole?" Pennsylvania State University host: Steve Finkelstein |
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"Puzzles in the Structure of Disk Galaxies" Queen's University, Kingston, Ontario, Canada host: Karl Gebhardt |
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"Galaxy Build-up in the First Gyr: Insights from ultra-deep HST and Spitzer Observations" Yale University host: Steve Finkelstein |
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"Forming Earths and Mercuries: Solids Less Volatile than Ice" American Museum of Natural History, New York host: Joel Green |
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"Shedding Lyman Alpha Light on Cosmological Reionization" Arizona State University host: Steve Finkelstein |
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"From Disks to Planets: Observational Insights" Rice University host: Adam Kraus |
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"The Giant Magellan Telescope Project: Science and Status" Giant Magellan Telescope (GMT) host: Taft Armandroff |
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"There's Government in Your Science" American Astronomical Society host: Jeff Silverman |
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DeVaucouleurs Medalist DeVaucouleurs Lecture: "The Growth of Supermassive Black Holes and Galaxy Evolution" Yale University dinner host: Shardha Jogee (Medal Awarded by Daniel Jaffe) |
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DeVaucouleurs Medalist Public Lecture: "Black Holes, Galaxies and the Evolution of the Universe: An Observer's View" Yale University dinner host: Daniel Jaffe |
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DeVaucouleurs Medalist UT CNS Women in Science Lecture: "Why So Few? The Dearth of Women in Science" Yale University dinner host: Dean Linda Hicke |
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"Brown Dwarfs as Exoplanet Analogs" The recent discovery of young, late-L or early-T type brown dwarfs provides a unique opportunity for detailed study of exoplanet atmospheres. These newly-discovered objects have colors, spectra and luminosities that are remarkably similar to the directly-imaged exoplanets around beta Pic, HR 8799, and 2MASS J1207. Several of these objects can be tied to local young kinematic groups, which allows a determination of age and implies planetary masses. These isolated brown dwarfs provide an interesting analog to young, dusty exoplanets in a context where detailed study of the atmospheric dust/cloud properties is possible. Using near-IR spectroscopy, we characterize the spectral type and surface gravities of these objects. We determine the effective temperatures inferred by the spectral types, atmospheric models, and luminosities of extremely red objects. At a given spectral type, we find that extremely red, young L dwarfs are cooler than field objects. The temperatures inferred by atmospheric models lead to physically implausible radii, similar to the discord seen in model atmosphere fits of young, dusty planets. Bucknell University, Lewisburg PA host: Adam Kraus |
Visitors to the Department of Astronomy can find detailed information and maps on our Visiting Austin Page.
Please report omissions/corrections to: G. Orris at argus@astro.as.utexas.edu.
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