Colloquia Schedule Spring 2014
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
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No talk scheduled. |
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"The Connection between Star Formation and the Cold Interstellar Medium in Nearby Galaxies" University of Arizona host: Shardha Jogee |
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"The Unusual Eclipser of the Young Star J1407: Moon-forming Circumplanetary Disk?" I'll discuss the recently discovered eclipsing system 1SWASP
J140747.93-394542.6 ("J1407"), J1407 is a pre-main sequence,
solar-mass, 16 million-year-old member of the nearest OB association
(Sco-Cen). J1407 exhibited an unusual, complex, and deep sequence of
eclipses over a 52-day period in 2007, which has thus far not
repeated. The eclipsing object appears to be a geometrically thin set
of rings girding a slightly denser inner disk probably associated with
a substellar object. The rings show evidence for clean gaps of low
optical depth between them, suggesting that small bodies may have
dynamically sculpted them. Thus far, follow-up obervations (RV,
imaging) are consistent with the companion being substellar - and most
likely planetary. The scale and inferred mass of the debris ring
system are suggestive of what might be expected of a protosatellite
disk in late stages of evolution orbiting a young giant planet. I'll
discuss follow-up observations of this system which are helping
constrain the nature of the ringed companion to
J1407. Protoexosatellites disks around young giant planets should be
significantly larger than the familiar planetary ring systems girding
the giant planets in our solar system. The large size of such
circumplanetary disks, and their potential for high optical depth,
makes them potentially much easier to discovery than transiting ring
systems of exoplanets. Eclipses of circumplanetary disks may not only
provide indirect evidence for exomoons, but also provide astronomers
with the means of testing models for the formation of planetary
satellites and giant planets themselves. University of Rochester host: TBA |
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"A Calibration of the Stellar-mass Fundamental Plane at
Massachusetts Institute of Technology host: Pawan Kumar |
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Tinsley Visiting Scholar, Interstellar Matter Group "Volatiles in Protoplanetary Disks" Space Telescope Science Institute (STScI) host: Neal Evans |
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DeVaucouleurs Medalist: COLLOQUIUM "Connecting Gas to Stars in Galaxies" University of Cambridge, UK host: Neal Evans |
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DeVaucouleurs Medalist: PUBLIC LECTURE "The Hidden Universe Revealed" University of Cambridge, UK host: Neal Evans |
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"The Seeds of Massive Galaxies" University of Edinburgh host: Shardha Jogee |
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"Our Galactic Supermassive Black Hole Sgr A*: The Ideal Testbed for Theories of Accretion and Black Hole Life Cycles" University of Amsterdam host: Pawan Kumar |
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Spring Break: 10-14 March: No talk scheduled. |
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"Rest-frame Optical Spectra: A Window into Galaxy Formation at z~2" University of California, Los Angeles host: Steve Finkelstein |
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Tinsley Visiting Scholar, Stars Group "Hunting the First Generations of Stars and Galaxies" Massachusetts Institute of Technology host: Fritz Benedict |
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"Shadows of Their Future Selves: Accretion and Obscuration in Young Stellar Objects" Lowell Observatory host: Adam Kraus |
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"Head in the Clouds: Decoding the Spectral Features Produced by Brown Dwarf and Exoplanent Atmospheres" Hunter College/AMNH host: Adam Kraus |
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PhD Defense Presentation "Measuring Dark Matter Profiles Non-Parametrically in Dwarf Spheroidal Galaxies" University of Texas at Austin |
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"Hunting the First Galaxies with Gravitational Lensing" Space Telescope Science Institute (STScI) host: Steve Finkelstein |
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Tinsley Visiting Professor "Adventures in Cosmic Star Formation" National Optical Astronomy Observatory (NOAO) host: TBA |
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Tinsley Visiting Scholar, Exgal Group "MaNGA: Mapping Nearby Galaxies at Apache Point Observatory An IFU Survey of 10,000 Galaxies" University of Tokyo, IPMU host: Niv Drory |
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Tinsley Visiting Scholar, Planets Group "Extrasolar Planets with Small Telescopes" Princeton University host: Mike Endl |
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No talk scheduled. |
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"Stark Broadening of Hydrogen Spectral Lines in Plasmas: Advanced Theories, Benchmark Experiments, Astrophysical Applications" Auburn University host: Don Winget |
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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