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Stellar evolution models of B-type stars are still uncertain in terms of internal mixing properties, notably in the area between the convective core and the radiative envelope. This impacts age determination of such stars in addition to the…

Solar and Stellar Astrophysics · Physics 2023-09-26 Mathias Michielsen , Timothy Van Reeth , Andrew Tkachenko , Conny Aerts

We present a catalog of precise eclipse times and analysis of third body signals among 1279 close binaries in the latest Kepler Eclipsing Binary Catalog. For these short period binaries, Kepler's 30 minute exposure time causes significant…

Solar and Stellar Astrophysics · Physics 2015-06-16 Kyle E. Conroy , Andrej Prsa , Keivan G. Stassun , Jerome A. Orosz , Daniel C. Fabrycky , William F. Welsh

We report the discovery of four short-period eclipsing systems in the Kepler light curves, consisting of an A-star primary and a low-mass white dwarf (WD) secondary (dA+WD) - KIC 4169521, KOI-3818, KIC 2851474, and KIC 9285587. The systems…

Solar and Stellar Astrophysics · Physics 2015-12-09 Simchon Faigler , Ilya Kull , Tsevi Mazeh , Flavien Kiefer , David W. Latham , Steven Bloemen

Massive stars are important for the chemical enrichment of the universe. Since internal mixing processes influence their lives, it is very important to place constraints on the corresponding physical parameters, such as core overshooting…

Solar and Stellar Astrophysics · Physics 2014-10-08 P. I. Pápics , E. Moravveji , C. Aerts , A. Tkachenko , S. A. Triana , S. Bloemen , J. Southworth

The Kepler spacecraft has been monitoring the light from 150,000 stars in its primary quest to detect transiting exoplanets. Here we report on the detection of an eclipsing stellar hierarchical triple, identified in the Kepler photometry.…

Young multiple star systems provide excellent testing grounds for theories of star formation and evolution. EPIC 203868608 was previously studied~\citep{David2016} as a triple star system in the Upper Scorpius OB association, but the…

Solar and Stellar Astrophysics · Physics 2018-10-17 Ji Wang , Trevor J. David , Lynne Hillenbrand , Dimitri Mawet , Simon Albrecht , Zibo Liu

KIC 5773205 is the least luminous eclipsing M dwarf found in the Villanova catalog of eclipsing binaries detected by the {\it Kepler} mission. We processed and analyzed the three available quarters of mission data for this star and…

Solar and Stellar Astrophysics · Physics 2020-01-03 Valeri V. Makarov , Alexey Goldin

Eclipsing binaries in star clusters offer more stringent tests of stellar evolution theory than field binaries because models must not only match the binary properties, but also the radiative properties of all other cluster members at a…

Solar and Stellar Astrophysics · Physics 2018-10-24 Guillermo Torres , Jason L. Curtis , Andrew Vanderburg , Adam L. Kraus , Aaron Rizzuto

We report here on the discovery of stellar occultations, observed with Kepler, that recur periodically at 15.685 hour intervals, but which vary in depth from a maximum of 1.3% to a minimum that can be less than 0.2%. The star that is…

Earth and Planetary Astrophysics · Physics 2015-06-03 S. Rappaport , A. Levine , E. Chiang , I. El Mellah , J. Jenkins , B. Kalomeni , E. S. Kite , M. Kotson , L. Nelson , L. Rousseau-Nepton , K. Tran

The lack of RR Lyr stars in binary systems is an atypical fact when we compared it to other classes of variables. Therefore, it has become a challenge for observers to detect an RR Lyr variable in a binary system. The RR Lyr variable KIC…

By cross-matching the eclipsing binary catalog from TESS with that from LAMOST MRS, semi-detached eclipsing binaries with radial velocities coverage spanning more than 0.3 phases were authenticated. The absolute parameters for these systems…

Solar and Stellar Astrophysics · Physics 2024-12-11 Yajuan Lei , Guiping Zhou , Liang Wang , Guangwei Li , Kai Li , Tuan Yi

The characterisation of detached eclipsing binaries with low mass components has become important when verifying the role of convection in stellar evolutionary models, which requires model-independent measurements of stellar parameters with…

Solar and Stellar Astrophysics · Physics 2022-06-29 Patricia Cruz , John F. Aguilar , Hernán E. Garrido , Marcos P. Diaz , Enrique Solano

KIC 12557548 b is first of a growing class of intriguing disintegrating planet candidates, which lose mass in the form of a metal rich vapor that condenses into dust particles. Here, we follow up two perplexing observations of the system:…

We present an early result from an automated search of Kepler eclipsing binary systems for circumbinary companions. An intriguing tertiary signal has been discovered in the short period eclipsing binary KIC002856960. This third body leads…

Earth and Planetary Astrophysics · Physics 2015-06-11 D. Armstrong , D. Pollacco , C. A. Watson , F. Faedi , Y. Gómez Maqueo Chew , H. M. Cegla , P. McDaid , J. Burton , J. McCormac , I. Skillen

K2, the two-wheel mission of the Kepler space telescope, observed the pulsating subdwarf B star EQ Psc during engineering tests in 2014 February. In addition to a rich spectrum of g-mode pulsation frequencies, the observations demonstrate a…

Solar and Stellar Astrophysics · Physics 2015-06-19 C. S. Jeffery , Gavin Ramsay

We present the discovery of KIC 9632895b, a 6.2 Earth-radius planet in a low-eccentricity, 240.5-day orbit about an eclipsing binary. The binary itself consists of a 0.93 and 0.194 solar mass pair of stars with an orbital period of 27.3…

We present time-series spectroscopy and photometry of Gaia DR2 6097540197980557440, a new deeply-eclipsing hot subdwarf B (sdB) + M dwarf (dM) binary. We discovered this object during the course of the Eclipsing Reflection Effect Binaries…

Solar and Stellar Astrophysics · Physics 2021-09-08 Kyle A. Corcoran , Brad N. Barlow , Veronika Schaffenroth , Uli Heber , Stephen Walser , Andreas Irgang

We have discovered that the brown dwarf WISEJ014656.66+423410.0 is a close binary (0.0875$\pm$0.0021 arcsec, 0.93$^{+0.12}_{-0.16}$ AU) from Keck laser guide star adaptive optics imaging. Our photometry for this system reveals that both…

Solar and Stellar Astrophysics · Physics 2015-06-23 Trent J. Dupuy , Michael C. Liu , S. K. Leggett

Previous studies on the rotation of Sun-like stars revealed that the rotational rates of young stars converge towards a well-defined evolution that follows a power-law decay. It seems, however, that some binary stars do not obey this…

Stellar structure and evolution can be studied in great detail by asteroseismic methods, provided data of high precision are available. We determine the effective temperature (Teff), surface gravity (log g), metallicity, and the projected…

Solar and Stellar Astrophysics · Physics 2015-05-20 Joanna Molenda-Zakowicz , David W. Latham , Giovanni Catanzaro , Antonio Frasca , Samuel N. Quinn