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VANDAM survey of Orion protostars. II.
We have conducted a survey of 328 protostars in the Orion molecular clouds with the Atacama Large Millimeter/submillimeter Array at 0.87mm at a resolution of ~0.1" (40au),... -
Oscillations in red giants from TESS data
Since the onset of the "space revolution" of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archeology... -
APOGEE-Kepler Cool Dwarf star ages determination
We use models of stellar angular momentum evolution to determine ages for ~500 stars in the APOGEE-Kepler Cool Dwarfs sample. We focus on lower-main-sequence stars, where other... -
Robo-AO Kepler asteroseismic survey. II.
The Kepler Space Telescope observed over 15000 stars for asteroseismic studies. Of these, 75% of dwarfs (and 8% of giants) were found to show anomalous behavior, such as... -
Short-duration stellar flares from GALEX & Kepler
We report on a population of short-duration near-ultraviolet (NUV) flares in stars observed by the Kepler and Galaxy Evolution Explorer (GALEX) missions. We analyzed the NUV... -
Spectroscopic analysis of the CKS sample. I.
We present results from a quantitative spectroscopic analysis conducted on archival Keck/HIRES high-resolution spectra from the California-Kepler Survey (CKS) sample of... -
Interferometric obs. of B-type stars with CHARA
We present interferometric observations of 25 spectral type-B stars that were made with the Precision Astronomical Visible Observations and the CLassic Interferometry with... -
Detached eclipsing binaries with Gaia parallaxes
Using a sample of 81 Galactic, detached eclipsing binary stars we investigated the global zero-point shift of their parallaxes with the Gaia Data Release 2 (DR2) parallaxes. The... -
Spot parameters on KIC solar-type stars
Active solar-type stars show large quasi-periodic brightness variations caused by stellar rotation with star spots, and the amplitude changes as the spots emerge and decay. The... -
Revised radii of KIC stars & planets using Gaia DR2
One bottleneck for the exploitation of data from the Kepler mission for stellar astrophysics and exoplanet research has been the lack of precise radii and evolutionary states... -
HZ borders for syst. with a giant planet
The presence of giant planets influences potentially habitable worlds in numerous ways. Massive celestial neighbors can facilitate the formation of planetary cores and modify... -
Spectroscopic and photometric analysis of WDs
We present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the... -
340GHz SMA obs. of 50 nearby protoplanetary disks
We present a survey at subarcsecond resolution of the 340GHz dust continuum emission from 50 nearby protoplanetary disks, based on new and archival observations with the... -
KIC star parallaxes from asteroseismology vs Gaia
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... -
Mass-radius relationship for planets with Rp<4
The Kepler Mission has discovered thousands of planets with radii <4R_{earth}, paving the way for the first statistical studies of the dynamics, formation, and evolution of... -
Rotation-Activity Correlations in K-M dwarfs. I.
The reliable determination of rotation-activity correlations (RACs) depends on precise measurements of the following stellar parameters: T_eff_, parallax, radius, metallicity,... -
False positive probabilities for Q1-Q17 DR24 KOIs
We present astrophysical false positive probability calculations for every Kepler Object of Interest (KOI) --the first large-scale demonstration of a fully automated transiting... -
Early-type EBs with intermediate orbital periods
We analyze 221 eclipsing binaries (EBs) in the Large Magellanic Cloud with B-type main-sequence (MS) primaries (M_1_~4-14 M_{sun}) and orbital periods P=20-50 days that were... -
Transiting Exoplanet Survey Satellite (TESS)
The Transiting Exoplanet Survey Satellite (TESS) is a NASA-sponsored Explorer mission that will perform a wide-field survey for planets that transit bright host stars. Here, we... -
Stellar and planet properties for K2 candidates
The extended Kepler mission, K2, is now providing photometry of new fields every three months in a search for transiting planets. In a recent study, Foreman-Mackey and...