Colloquia Schedule Fall 2014

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

Sep. 2

"Hot Chromospheres and Flares on Cool and Ultracool Dwarfs"

abstract

Sarah Jane Schmidt

Ohio State University

host: Adam Kraus

Sep. 9

"Let it Collide: An Epic Saga of Star Wars Planets, Planetesimals, and Super Planet Crashes"

abstract

Stefano Meschiari

University of Texas at Austin

host: Adam Kraus

Sep. 16

"The Complex Interplay between Star Formation and Galaxy Evolution from z~0-6"

abstract

Desika Narayanan

Haverford College

host: Steve Finkelstein

Sep. 23

"Compact Galaxies and Super-Massive Black Holes"

abstract

Remco van den Bosch

Max Planck Institute for Astronomy (MPIA), Heidelberg

host: Karl Gebhardt

Sep. 30

"The Architecture and Timing of Planetary Systems"

abstract

Daniel Fabrycky

University of Chicago

host: TBD

Oct. 7

"Who's Afraid of the Big Bad Supermassive Black Hole?"

abstract

Jonathan Trump

Pennsylvania State University

host: Steve Finkelstein

Oct. 14

"Puzzles in the Structure of Disk Galaxies"

abstract

Stephane Courteau

Queen's University, Kingston, Ontario, Canada

host: Karl Gebhardt

Oct. 21

"Galaxy Build-up in the First Gyr: Insights from ultra-deep HST and Spitzer Observations"

abstract

Pascal Oesch

Yale University

host: Steve Finkelstein

Oct. 28

"Forming Earths and Mercuries: Solids Less Volatile than Ice"

abstract

Alexander Hubbard

American Museum of Natural History, New York

host: Joel Green

Nov. 4

"Shedding Lyman Alpha Light on Cosmological Reionization"

abstract

James Rhoads

Arizona State University

host: Steve Finkelstein

Nov. 11

"Title: TBA"

abstract

Andrea Isella

Rice University

host: Adam Kraus

Nov. 18

"Title: TBA"

abstract

Rebecca Bernstein

Giant Magellan Telescope Observatory

host: Taft Armandroff

Nov. 25

"Title: TBA"

abstract

Speaker: TBD

Affiliation: TBD

host: TBD

Dec. 2

DeVaucouleurs Medalist

DeVaucouleurs Lecture: "The Growth of Supermassive Black Holes and Galaxy Evolution"

abstract

C. Megan Urry

Yale University

host: Shardha Jogee

Dec. 3
ECJ 1.202

DeVaucouleurs Medalist

Public Lecture: "Black Holes, Galaxies and the Evolution of the Universe: An Observer's View"

abstract

C. Megan Urry

Yale University

host: Shardha Jogee

Dec. 9

"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.

close

Katelyn Allers

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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