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Jul 27, 2013
By xavier

An Explanation for the Different X-ray to Optical Column Densities in…

We study the > 10 ratios in the X-ray to optical column densities inferred from afterglow spectra of Gamma Ray Bursts due to gas surrounding their pr…
Jul 18, 2009

Collisions of white dwarfs as a new progenitor channel for type Ia …

We present the results of a systematic numerical study of an alternative progenitor scenario to produce type Ia supernova explosions, which is not re…
Jul 07, 2009
By neil

Inflating and Deflating Hot Jupiters: Coupled Tidal and Thermal Evo…

We examine the radius evolution of close-in giant planets with a planet evolution model that couples the orbital-tidal and thermal evolution. For 45 …
May 31, 2011

Stochastic star formation and a (nearly) uniform stellar initial mass…

Recent observations indicate a lower Halpha to FUV ratio in dwarf galaxies than in brighter systems, a trend that could be explained by a truncated a…
Feb 25, 2014
By kchen

Pair Instability Supernovae of Very Massive Population III Stars

Numerical studies of primordial star formation suggest that the first stars in the universe may have been very massive. Stellar models indicate that …
Jan 30, 2015
By mathews

Hot gaseous atmospheres in galaxy groups and clusters are both heated…

Expanding X-ray cavities observed in hot gas atmospheres of many galaxy groups and clusters generate shock waves and turbulence that are primary heat…
Aug 24, 2013
By jjfang

A Link Between Star Formation Quenching and Inner Stellar Mass Densit…

We study the correlation between galaxy structure and the quenching of star formation using a sample of SDSS central galaxies with stellar masses 9.7…
Feb 14, 2012
By howley1

Internal Stellar Kinematics of M32 from the SPLASH Survey: Dark Halo …

As part of the SPLASH survey of the Andromeda galaxy (M31) and its neighbors, we have obtained Keck/DEIMOS spectra of the compact elliptical (cE) sat…
May 05, 2013
By peter

Deuterium Burning in Massive Giant Planets and Low-Mass Brown Dwarfs …

Formation of bodies near the deuterium-burning limit is considered by detailed numerical simulations according to the core-nucleated giant planet acc…
Nov 14, 2007

The advent of the Spitzer Space Telescope and the discovery of short-period planets on significantly eccentric orbits has presented astronomers with the opportunity to observe time-dependent weather patterns on extrasolar planets. Giant planets on e…

Hydrodynamic Simulations of Unevenly Irradiated Jovian Planets

We employ a two-dimensional grid-based hydrodynamic model to simulate upper atmospheric dynamics on extrasolar giant planets. Our model is well-suite…
Jul 14, 2011
By rmcgurk

Spatially-Resolved Spectroscopy of SDSS J0952+2552: a Confirmed Dual …

Most massive galaxies contain supermassive black holes (SMBHs) in their cores. When galaxies merge, gas is driven to nuclear regions and can accrete …
Sep 09, 2014
By sloanew

Toward the Detection of Exoplanet Transits with Polarimetry

In contrast to photometric transits, whose peak signal occurs at mid-transit due to occultation of the brightest region of the disk, polarimetric tra…
Nov 11, 2008
By kurtis

Probing The Lower Mass Limit for Supernova Progenitors and the High-M…

We present a photometric and spectroscopic study of the white dwarf population of the populous, intermediate-age open cluster M35 (NGC 2168); this st…
Oct 26, 2010
By woosley

Sub-Chandrasekhar Mass Models For Type Ia Supernovae

For carbon-oxygen white dwarfs accreting hydrogen or helium at rates in the range ~1-10 x 10^(-8) Msun/y, a variety of explosive outcomes is possible…
Nov 13, 2008
By xavier

On the (Non)Evolution of HI Disks over Cosmic Time

We present new results on the frequency distribution of projected HI column densities f(N,X), total comoving covering fraction, and integrated mass d…
Jan 10, 2019

A Novel Approach to Constrain Rotational Mixing & Convective-Core O…

The semi-empirical initial-final mass relation (IFMR) connects spectroscopically analyzed white dwarfs in star clusters to the initial masses of the …
Dec 11, 2010
By jfg

Consequences of the Ejection and Disruption of Giant Planets

The discovery of Jupiter-mass planets in close orbits about their parent stars has challenged models of planet formation. Recent observations have sh…
Jun 09, 2010
By tesla

Implications of Fermi Observations for Hadronic Models of Radio Halos…

We analyze the impact of the Fermi non-detection of gamma-ray emission from clusters of galaxies on hadronic models for the origin of cluster radio h…
Dec 19, 2014
By sloanew

Simultaneous Linear and Circular Optical Polarimetry of Asteroid (4) …

From a single, 3.8-hour observation of asteroid (4) Vesta at $13.7^\circ$ phase angle with the POLISH2 polarimeter at the Lick Observatory Shane 3-m …
Nov 06, 2012
By poesch

A Rest-frame Optical View on z~4 Galaxies I: Color and Age Distributi…

We present a study of rest-frame UV-to-optical color distributions for z~4 galaxies based on the combination of deep HST/ACS+WFC3/IR data with Spitze…
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