Search Publications
Kiloparsec-Scale Variations in the Star Formation Efficiency of Dense Gas: The Antennae Galaxies (NGC 4038/39)
Wilson, Christine D.; Bemis, Ashley
We study the relationship between dense gas and star formation in the Antennae galaxies by comparing Atacama large millimeter/submillimeter array (ALMA) observations of dense-gas tracers (HCN, HCO+, and HNC J = 1-0) with the total infrared luminosity (L TIR) calculated using data from the Herschel Space Observatory and the Sp…
Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions
Schneider, Glenn; Metchev, Stanimir; Apai, Dániel +11 more
Directly imaged planetary-mass companions offer unique opportunities in atmospheric studies of exoplanets. They share characteristics of both brown dwarfs and transiting exoplanets, and therefore are critical for connecting atmospheric characterizations for these objects. Rotational phase mapping is a powerful technique to constrain the condensate…
Stellar Properties of Active G and K Stars: Exploring the Connection between Starspots and Chromospheric Activity
Hawley, Suzanne L.; Agol, Eric; Curtis, Jason L. +2 more
We gathered high resolution spectra for an ensemble of 55 bright active and inactive stars using the ARC 3.5 m Telescope Echelle Spectrograph at Apache Point Observatory (R ≈ 31,500). We measured spectroscopic effective temperatures, surface gravities, and metallicities for most stars in the sample with SME and MOOG. Our stellar property results a…
Lyα in the GJ 1132 System: Stellar Emission and Planetary Atmospheric Evolution
Charbonneau, David; Kempton, Eliza M. -R.; Newton, Elisabeth +6 more
GJ 1132b, which orbits an M dwarf, is one of the few known Earth-sized planets, and at 12 pc away it is one of the closest known transiting planets. Receiving roughly 19× Earth’s insolation, this planet is too hot to be habitable but can inform us about the volatile content of rocky planet atmospheres around cool stars. Using Hubble Space Telescop…
A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2
Brown, A. G. A.; Messineo, M.
We investigate individual distances and luminosities of a sample of 889 nearby candidate red supergiants (RSGs) with reliable parallaxes (ϖ/σ ϖ > 4 and RUWE < 2.7) from Gaia Data Release 2 (DR2). The sample was extracted from the historical compilation of spectroscopically derived spectral types by Skiff, and consists of K-M sta…
A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906
Kalas, Paul; De Rosa, Robert J.
We present an investigation into the kinematics of HD 106906 using the newly released Gaia DR2 catalog to search for close encounters with other members of the Scorpius-Centaurus (Sco-Cen) association. HD 106906 is an eccentric spectroscopic binary that hosts both a large asymmetric debris disk extending out to at least 500 au and a directly image…
The Swift UVOT Stars Survey. III. Photometry and Color-Magnitude Diagrams of 103 Galactic Open Clusters
Hagen, Lea M. Z.; Siegel, Michael H.; Porterfield, Blair L. +2 more
As part of the Swift/Ultraviolet-Optical Telescope Stars Survey, we present near-ultraviolet (NUV; 3000-1700 Å) point-source photometry for 103 Galactic open clusters. These data, taken over the span of the mission, provide a unique and unprecedented set of NUV point-source photometry on simple stellar populations. After applying a membership anal…
Radial Velocity Discovery of an Eccentric Jovian World Orbiting at 18 au
Vanderburg, Andrew; Cochran, William D.; Endl, Michael +25 more
Based on two decades of radial velocity (RV) observations using Keck/High Resolution Echelle Spectrometer (HIRES) and McDonald/Tull, and more recent observations using the Automated Planet Finder, we found that the nearby star HR 5183 (HD 120066) hosts a 3 {M}{{J}} minimum mass planet with an orbital period of {74}-22+43…
The Enigmatic (Almost) Dark Galaxy Coma P: Distance Measurement and Stellar Populations from HST Imaging
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +9 more
We present Hubble Space Telescope (HST) observations of the low surface brightness (SB) galaxy Coma P. This system was first discovered in the Arecibo Legacy Fast ALFA H I survey and was cataloged as an (almost) dark galaxy because it did not exhibit any obvious optical counterpart in the available survey data (e.g., Sloan Digital Sky Survey). Sub…
Spectroscopic Orbits of Subsystems in Multiple Stars. VI.
Tokovinin, Andrei
Thirteen spectroscopic orbits of late-type stars are determined from the high-resolution spectra taken with the CHIRON echelle spectrometer at the 1.5 m Cerro Tololo Inter-American Observatory telescope. Most (HIP 14194B, 40523A, 41171A, 51578A, 57572B, 59426A, 62852B, 66438A, 87813B, and 101472A) are inner subsystems in hierarchical multiple star…