Colloquia Schedule Spring 2014

Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B

Jan. 14

No talk scheduled.

abstract

Jan. 21

"The Connection between Star Formation and the Cold Interstellar Medium in Nearby Galaxies"

abstract

Karin Sandstrom

University of Arizona

host: Shardha Jogee

Jan. 28

"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.

close

Eric Mamajek

University of Rochester

host: TBA

Feb. 4

"A Calibration of the Stellar-mass Fundamental Plane at z = 0.4 using the Micro-lensing Induced Flux Ratio Anomalies of Macro-lensed Quasars"

abstract

Paul L. Schechter

Massachusetts Institute of Technology

host: Pawan Kumar

Feb. 11

Tinsley Visiting Scholar, Interstellar Matter Group

"Volatiles in Protoplanetary Disks"

abstract

Klaus Pontoppidan

Space Telescope Science Institute (STScI)

host: Neal Evans

Feb. 18

DeVaucouleurs Medalist: COLLOQUIUM

"Connecting Gas to Stars in Galaxies"

abstract

Robert C. Kennicutt, Jr.

University of Cambridge, UK

host: Neal Evans

Feb. 19
CPE 2.208
4:00 PM

DeVaucouleurs Medalist: PUBLIC LECTURE

"The Hidden Universe Revealed"

abstract

Robert C. Kennicutt, Jr.

University of Cambridge, UK

host: Neal Evans

Feb. 25

"The Seeds of Massive Galaxies"

abstract

Sadegh Khochfar

University of Edinburgh

host: Shardha Jogee

Mar. 4

"Our Galactic Supermassive Black Hole Sgr A*: The Ideal Testbed for Theories of Accretion and Black Hole Life Cycles"

abstract

Sera Markoff

University of Amsterdam

host: Pawan Kumar

Mar. 11

Spring Break: 10-14 March: No talk scheduled.


Mar. 18

"Rest-frame Optical Spectra: A Window into Galaxy Formation at z~2"

abstract

Alice E. Shapley

University of California, Los Angeles

host: Steve Finkelstein

Mar. 25

Tinsley Visiting Scholar, Stars Group

"Hunting the First Generations of Stars and Galaxies"

abstract

Anna Frebel

Massachusetts Institute of Technology

host: Fritz Benedict

Apr. 1

"Shadows of Their Future Selves: Accretion and Obscuration in Young Stellar Objects"

abstract

Kevin R. Covey

Lowell Observatory

host: Adam Kraus

Apr. 8

"Head in the Clouds: Decoding the Spectral Features Produced by Brown Dwarf and Exoplanent Atmospheres"

abstract

Kelle Cruz

Hunter College/AMNH

host: Adam Kraus

Apr. 15

"Hunting the First Galaxies with Gravitational Lensing"

abstract

Dan A. Coe

Space Telescope Science Institute (STScI)

host: Steve Finkelstein

Apr. 22

Tinsley Visiting Professor

"Adventures in Cosmic Star Formation"

abstract

Mark E. Dickinson

National Optical Astronomy Observatory (NOAO)

host: TBA

Apr. 23
Wed
3 PM

Tinsley Visiting Scholar, Exgal Group

"MaNGA: Mapping Nearby Galaxies at Apache Point Observatory An IFU Survey of 10,000 Galaxies"

abstract

Kevin A. Bundy

University of Tokyo, IPMU

host: Niv Drory

Apr. 25
Fri
2 PM

Tinsley Visiting Scholar, Planets Group

"Extrasolar Planets with Small Telescopes"

abstract

Gaspar Bakos

Princeton University

host: Mike Endl

Apr. 29

No talk scheduled.

abstract

May 6

"Stark Broadening of Hydrogen Spectral Lines in Plasmas: Advanced Theories, Benchmark Experiments, Astrophysical Applications"

abstract

Eugene Oks

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.

Next

Spring '15

Current

Fall '14

Previous

Summer '14

Spring '14

Fall '13

Spring '13

Fall '12

Spring '12

Fall '11

Spring '11

Fall '10

Spring '10

Fall '09

Spring '09

Fall '08

Spring '08

Fall '07

Spring '07

Fall '06

Spring '06

Fall '05

Spring '05

Fall '04

Spring '04

Fall '03

Spring '03

Fall '02