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Probable Dormant Neutron Star in a Short-Period Binary System
Tsevi Mazeh, Simchon Faigler, Dolev Bashi +24
We have identified 2XMM J125556.57+565846.4, at a distance of 600 pc, as a binary system consisting of a normal star and a probable dormant neutron star. Optical spectra exhibit a…
Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9
Kevin K. Hardegree-Ullman, Jon K. Zink, Jessie L. Christiansen +3
Previous measurements of stellar properties for K2 stars in the Ecliptic Plane Input Catalog (EPIC; Huber et al. 2016) largely relied on photometry and proper motion measurements,…
Eclipsing binaries in the open cluster Ruprecht 147. II: EPIC 219568666
Guillermo Torres, Andrew Vanderburg, Jason L. Curtis +7
We report our spectroscopic monitoring of the detached, grazing, and slightly eccentric 12-day double-lined eclipsing binary EPIC 219568666 in the old nearby open cluster Ruprecht…
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars IV: Updated Properties for 86 Cool Dwarfs Observed During Campaigns 1-17
Courtney D. Dressing, Kevin Hardegree-Ullman, Joshua E. Schlieder +15
We present revised stellar properties for 172 K2 target stars that were identified as possible hosts of transiting planets during Campaigns 1-17. Using medium-resolution near-infra…
Astro2020 Science White Paper: Stellar Physics and Galactic Archeology using Asteroseismology in the 2020's
Daniel Huber, Sarbani Basu, Paul Beck +32
Asteroseismology is the only observational tool in astronomy that can probe the interiors of stars, and is a benchmark method for deriving fundamental properties of stars and exopl…
Characterization of Low Mass K2 Planet Hosts Using Near-Infrared Spectroscopy
Romy Rodríguez Martínez, Sarah Ballard, Andrew Mayo +3
We present moderate resolution near-infrared spectra in and band of M dwarf hosts to candidate transiting exoplanets discovered by NASA's K2 mission. We employ known emp…
Rotation in the Pleiades with K2: I. Data and First Results
L. M. Rebull, J. R. Stauffer, J. Bouvier +16
Young (125 Myr), populous (1000 members), and relatively nearby, the Pleiades has provided an anchor for stellar angular momentum models for both younger and older stars. We use…
Discovery of the spectroscopic binary nature of three bright southern Cepheids
L. Szabados, R. I. Anderson, A. Derekas +4
We present an analysis of spectroscopic radial velocity and photometric data of three bright Galactic Cepheids: LR Trianguli Australis (LR TrA), RZ Velorum (RZ Vel), and BG Velorum…
Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
Daniel Huber, William J. Chaplin, Jørgen Christensen-Dalsgaard +31
We have used asteroseismology to determine fundamental properties for 66 Kepler planet-candidate host stars, with typical uncertainties of 3% and 7% in radius and mass, respectivel…
Observations of intensity fluctuations attributed to granulation and faculae on Sun-like stars from the Kepler mission
C. Karoff, T. L. Campante, J. Ballot +6
Sun-like stars show intensity fluctuations on a number of time scales due to various physical phenomena on their surfaces. These phenomena can convincingly be studied in the freque…
Photometrically derived masses and radii of the planet and star in the TrES-2 system
Thomas Barclay, Daniel Huber, Jason F. Rowe +16
We measure the mass and radius of the star and planet in the TrES-2 system using 2.7 years of observations by the Kepler spacecraft. The light curve shows evidence for ellipsoidal…
Seismic evidence for a rapidly rotating core in a lower-giant-branch star observed with Kepler
S. Deheuvels, R. A. Garcia, W. J. Chaplin +24
Rotation is expected to have an important influence on the structure and the evolution of stars. However, the mechanisms of angular momentum transport in stars remain theoretically…
Atmospheric parameters of 82 red giants in the Kepler field
A. O. Thygesen, S. Frandsen, H. Bruntt +10
Context: Accurate fundamental parameters of stars are essential for the asteroseismic analysis of data from the NASA Kepler mission. Aims: We aim at determining accurate atmospheri…
A Class of Eccentric Binaries with Dynamic Tidal Distortions Discovered with Kepler
Susan E. Thompson, Mark Everett, Fergal Mullally +10
We have discovered a class of eccentric binary systems within the Kepler data archive that have dynamic tidal distortions and tidally-induced pulsations. Each has a uniquely shaped…
Seismic evidence for non-synchronization in two close sdB+dM binaries from Kepler photometry
Herbert Pablo, Steven D. Kawaler, M. D. Reed +16
We report on extended photometry of two pulsating sdB stars in close binaries. For both cases, we use rotational splitting of the pulsation frequencies to show that the sdB compone…
Kepler-21b: A 1.6REarth Planet Transiting the Bright Oscillating F Subgiant Star HD 179070
Steve B. Howell, Jason F. Rowe, Stephen T. Bryson +63
We present Kepler observations of the bright (V=8.3), oscillating star HD 179070. The observations show transit-like events which reveal that the star is orbited every 2.8 days by…
Fundamental properties of five Kepler stars using global asteroseismic quantities and ground-based observations
O. L. Creevey, G. Dogan, A. Frasca +34
We present an asteroseismic study of the solar-like stars KIC 11395018, KIC 10273246, KIC 10920273, KIC 10339342, and KIC 11234888 using short-cadence time series of more than eigh…
Constructing a one-solar-mass evolutionary sequence using asteroseismic data from \textit{Kepler}
V. Silva Aguirre, W. J. Chaplin, J. Ballot +39
Asteroseismology of solar-type stars has entered a new era of large surveys with the success of the NASA \textit{Kepler} mission, which is providing exquisite data on oscillations…
Global asteroseismic properties of solar-like oscillations observed by Kepler : A comparison of complementary analysis methods
G. A. Verner, Y. Elsworth, W. J. Chaplin +24
We present the asteroseismic analysis of 1948 F-, G- and K-type main-sequence and subgiant stars observed by the NASA {\em Kepler Mission}. We detect and characterise solar-like os…
Predicting the detectability of oscillations in solar-type stars observed by Kepler
W. J. Chaplin, H. Kjeldsen, T. R. Bedding +49
Asteroseismology of solar-type stars has an important part to play in the exoplanet program of the NASA Kepler Mission. Precise and accurate inferences on the stellar properties th…