Search Publications
A New Generation of Standard Solar Models
Basu, Sarbani; Serenelli, Aldo M.; Bergström, Johannes +6 more
We compute a new generation of standard solar models (SSMs) that includes recent updates on some important nuclear reaction rates and a more consistent treatment of the equation of state. Models also include a novel and flexible treatment of opacity uncertainties based on opacity kernels, required in light of recent theoretical and experimental wo…
Evolution of Interstellar Medium, Star Formation, and Accretion at High Redshift
Aussel, H.; Ivison, R. J.; Ilbert, O. +20 more
ALMA observations of the long wavelength dust continuum are used to estimate the interstellar medium (ISM) masses in a sample of 708 galaxies at z = 0.3 to 4.5 in the COSMOS field. The galaxy sample has known far-infrared luminosities and, hence, star formation rates (SFRs) and stellar masses ({M}* ) from the optical-infrared spectrum f…
Dust in the Reionization Era: ALMA Observations of a z = 8.38 Gravitationally Lensed Galaxy
Pérez-Fournon, I.; Laporte, N.; Bauer, F. E. +6 more
We report on the detailed analysis of a gravitationally lensed Y-band dropout, A2744_YD4, selected from deep Hubble Space Telescope imaging in the Frontier Field cluster Abell 2744. Band 7 observations with the Atacama Large Millimeter/submillimeter Array (ALMA) indicate the proximate detection of a significant 1 mm continuum flux suggesting the p…
Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II.Radii, Masses, and Ages
Chaplin, William J.; Davies, Guy R.; Latham, David W. +21 more
We use asteroseismic data from the Kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full year by the mission. We distributed tens of individual oscillation frequencies extracted from the time series of each star among seven modeling teams who applied different methods to determi…
The z ∼ 6 Luminosity Function Fainter than -15 mag from the Hubble Frontier Fields: The Impact of Magnification Uncertainties
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +2 more
We use the largest sample of z∼ 6 galaxies to date from the first four Hubble Frontier Fields clusters to set constraints on the shape of the z∼ 6 luminosity functions (LFs) to fainter than {M}{UV,{AB}}=-14 mag. We quantify, for the first time, the impact of magnification uncertainties on LF results and thus provide more realistic const…
Structural and Star-forming Relations since z ∼ 3: Connecting Compact Star-forming and Quiescent Galaxies
Barro, Guillermo; Pérez-González, Pablo G.; Kocevski, Dale D. +13 more
We study the evolution of the scaling relations that compare the effective density ({{{Σ }}}{{e}},r< {r}{{e}}) and core density ({{{Σ }}}1,r< 1 kpc) to the stellar masses of star-forming galaxies (SFGs) and quiescent galaxies. These relations have been fully in place since z∼ 3 and have exhibited almost const…
Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
Petigura, Erik A.; von Braun, Kaspar; Yee, Samuel W.
Classification of stars, by comparing their optical spectra to a few dozen spectral standards, has been a workhorse of observational astronomy for more than a century. Here, we extend this technique by compiling a library of optical spectra of 404 touchstone stars observed with Keck/HIRES by the California Planet Search. The spectra have high reso…
The COS-Halos Survey: Metallicities in the Low-redshift Circumgalactic Medium
Tripp, Todd M.; Worseck, Gábor; Prochaska, J. Xavier +8 more
We analyze new far-ultraviolet spectra of 13 quasars from the z∼ 0.2 COS-Halos survey that cover the H I Lyman limit of 14 circumgalactic medium (CGM) systems. These data yield precise estimates or more constraining limits than previous COS-Halos measurements on the H I column densities {N}{{H}{{I}}}. We then apply a Monte-Carlo Markov …
Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
Chaplin, William J.; Davies, Guy R.; Latham, David W. +17 more
We present a comparison of parallaxes and radii from asteroseismology and Gaia DR1 (TGAS) for 2200 Kepler stars spanning from the main sequence to the red-giant branch. We show that previously identified offsets between TGAS parallaxes and distances derived from asteroseismology and eclipsing binaries have likely been overestimated for parallaxes …
New Physical Insights about Tidal Disruption Events from a Comprehensive Observational Inventory at X-Ray Wavelengths
Ramirez-Ruiz, Enrico; Auchettl, Katie; Guillochon, James
We perform a comprehensive study of the X-ray emission from 70 transient sources that have been classified as tidal disruption events (TDEs) in the literature. We explore the properties of these candidates, using nearly three decades of X-ray observations to quantify their properties and characteristics. We find that the emission from X-ray TDEs i…