Colloquia Schedule Fall 2012

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

Sep. 4

"Finding and Characterizing the Sources of the Ionizing Background with Keck and HST"

abstract

Brian Siana

University of California, Riverside

host: Steve Finkelstein

Sep. 11

1. "Investigating the Early Universe with Lyman-alpha Emission: Galactic Winds and Stellar Populations at z ~ 3.1"
2. "Two Can't Play That Game: The Perils of Planet Formation in Binary Environments"
3. "Magnetic Fields in the Milky Way"

Abstract 2) "Two Can't Play That Game": The existence of planets born in environments highly perturbed by a stellar companion represents a major challenge to the paradigm of planet formation. In numerical simulations, the presence of a close binary companion stirs up the relative velocity between planetesimals, and a protoplanetary gas disk exacerbates the issue by differentially phasing planetesimal orbits, ultimately interfering or altogether halting the delicate phase of assembly of planetary embryos. However, the detection of several planets in tight binary systems and the recent discovery of circumbinary "Tatooine" planets (including the multiple-planet system Kepler-47) establishes that planet formation in binary environments is clearly viable. I will discuss a number of physical processes (including the hitherto unexplored complication of small-scale turbulence in the disk) that conspire to make the binary environment particularly hostile to planetary assembly.

close

1. Emily McLinden, 2. Stefano Meschiari, and 3. Michael Pavel

University of Texas at Austin

host: Sarah Tuttle

Sep. 18

"Star Formation, Near and Far (y un anyo en Ame'rica del Sur)"

abstract

Neal Evans

University of Texas at Austin

host: Steve Finkelstein

Sep. 25

"Measuring Galaxy Evolution from Modern Near-IR Surveys"

abstract

Casey Papovich

Texas A&M University

host: Steve Finkelstein

Oct. 2

"Carbon Stars and Dust Production in the Local Group"

abstract

Gregory C. Sloan

Cornell University

host: Harriet Dinerstein

Oct. 9

"Peering Through the EoR Window with the Murchison Widefield Array"

abstract

Miguel F. Morales

University of Washington

host: Neal Evans

Oct. 16

"HETDEX Status"

abstract

Karl Gebhardt & Gary Hill

University of Texas at Austin

host: Steve Finkelstein

Oct. 23

"Stellar Feedback and the Ecology of the Galactic ISM"

abstract

John Bally

University of Colorado, Boulder

host: Keely Finkelstein

Oct. 30

"Obesity in the Universe: Why Did Early-Type Galaxies Grow in Size?"

abstract

Richard Ellis

California Institute of Technology

host: Paul Shapiro

Nov. 6

"The Gaseos Environment of Distant Galaxies"

abstract

Michele Fumagalli

University of California, Santa Cruz

host: Chris Sneden

Nov. 13

"Cassini-Huygens explores the Saturn System: Recent Discoveries and Science Highlights"

abstract

Linda Spilker

Jet Propulsion Laboratory

host: Bill Cochran

Nov. 20

"Exploring Galactic Chemical and Dynamical Evolution: Pre and Post SDSS-III/APOGEE"

abstract

Peter Frinchaboy

Texas Christian University

host: Chris Sneden

Nov. 27

"Understanding Galaxy Clusters, the Most Massive Objects in the Universe"

abstract

Lindsay King

University of Texas, Dallas

host: Karl Gebhardt

Dec. 4

"Galaxy Formation: Physics and Numerics"

abstract

Dusan Keres

University of California, San Diego

host: Karl Gebhardt

Dec. 10
Mon.

"Ultrahigh Energy Cosmic Rays, Pulsars, and Supernovae"

abstract

Kumiko Kotera

Institut d'Astrophysique de Paris

host: Milos Milosavljevic

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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