Search Publications
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…
A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies
Sanders, D. B.; Surace, J. A.; Inami, H. +20 more
We present an analysis of [O I]63, [O III]88, [N II]122, and [C II]158 far-infrared (FIR) fine-structure line observations obtained with Herschel/PACS, for ∼240 local luminous infrared galaxies (LIRGs) in the Great Observatories All-sky LIRG Survey. We find pronounced declines ("deficits") of line-to-FIR…
First Evidence of Running Cosmic Vacuum: Challenging the Concordance Model
Solà, Joan; Gómez-Valent, Adrià; de Cruz Pérez, Javier
Despite the fact that a rigid {{Λ }}-term is a fundamental building block of the concordance ΛCDM model, we show that a large class of cosmological scenarios with dynamical vacuum energy density {ρ }{{Λ }} together with a dynamical gravitational coupling G or a possible non-conservation of matter, are capable of seriously challenging th…
A millimeter Continuum Size-Luminosity Relationship for Protoplanetary Disks
Wilner, David J.; Andrews, Sean M.; Birnstiel, Tilman +1 more
We present a survey at subarcsecond resolution of the 340 GHz dust continuum emission from 50 nearby protoplanetary disks, based on new and archival observations with the Submillimeter Array. The observed visibility data were modeled with a simple prescription for the radial surface brightness profile. The results were used to extract intuitive, e…
A Consistent Retrieval Analysis of 10 Hot Jupiters Observed in Transmission
Aigrain, S.; Irwin, P. G. J.; Sing, D. K. +1 more
We present a consistent optimal estimation retrieval analysis of 10 hot Jupiter exoplanets, each with transmission spectral data spanning the visible to near-infrared wavelength range. Using the NEMESIS radiative transfer and retrieval tool, we calculate a range of possible atmospheric states for WASP-6b, WASP-12b, WASP-17b, WASP-19b, WASP-31b, WA…