An extreme-mass ratio, short-period eclipsing binary consisting of a B dwarf primary and a pre-main-sequence M star companion discovered by KELT
Article
Article Title | An extreme-mass ratio, short-period eclipsing binary consisting of a B dwarf primary and a pre-main-sequence M star companion discovered by KELT |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Stevens, Daniel J. (Author), Zhou, George (Author), Johnson, Marshall C. (Author), Rizzuto, Aaron C. (Author), Rodriguez, Joseph E. (Author), Bieryla, Allyson (Author), Collins, Karen A. (Author), Villanueva, Steven, Jr. (Author), Wright, Jason T. (Author), Gaudi, B. Scott (Author), Latham, David W. (Author), Beatty, Thomas G. (Author), Lund, Michael B. (Author), Siverd, Robert J. (Author), Kraus, Adam L. (Author), Wachiraphan, Patcharapol (Author), Berlind, Perry (Author), Calkins, Michael L. (Author), Esquerdo, Gilbert A. (Author), Kielkopf, John F. (Author), Kuhn, Rudolf B. (Author), Manner, Mark (Author), Pepper, Joshua (Author) and Stassun, Keivan G. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 499 (3), pp. 3775-3791 |
Year | 2020 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/staa3142 |
Web Address (URL) | https://academic.oup.com/mnras/article/499/3/3775/5921216 |
Abstract | We present the discovery of KELT J072709 + 072007 (HD 58730), a very low mass ratio (q ≡ M2/M1 ≈ 0.07) eclipsing binary (EB) identified by the Kilodegree Extremely Little Telescope (KELT) survey. We present the discovery light curve and perform a global analysis of four high-precision ground-based light curves, the Transiting Exoplanets Survey Satellite (TESS) light curve, radial velocity (RV) measurements, Doppler Tomography (DT) measurements, and the broad-band spectral energy distribution. Results from the global analysis are consistent with a fully convective (M2 = 0.22 ± 0.02 M☉) M star transiting a late-B primary (M1 = 3.34+−000709 M☉ and Teff,1 = 11960+−430520 K). We infer that the primary star is 183+−3330 Myr old and that the companion star's radius is inflated by 26 ± 8 per cent relative to the predicted value from a low-mass isochrone of similar age. We separately and analytically fit for the variability in the out-of-eclipse TESS phase curve, finding good agreement between the resulting stellar parameters and those from the global fit. Such systems are valuable for testing theories of binary star formation and understanding how the environment of a star in a close-but-detached binary affects its physical properties. In particular, we examine how a star's properties in such a binary might differ from the properties it would have in isolation. |
Keywords | Binaries: eclipsing; Eclipses; Stars: early-type; Stars: low-mass; Stars: pre-main-sequence; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Pennsylvania State University, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Las Cumbres Observatory, United States | |
University of Texas at Austin, United States | |
Academic Registrar's Office | |
Centre for Astrophysics | |
Massachusetts Institute of Technology, United States | |
Ohio State University, United States | |
Harvard-Smithsonian Centre for Astrophysics, United States | |
University of Arizona, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Gemini Observatory, United States | |
Mahidol University, Thailand | |
School of Mathematics, Physics and Computing | |
South African Astronomical Observatory, South Africa | |
Spot Observatory, United States | |
Lehigh University, United States | |
Vanderbilt University, United States |
https://research.usq.edu.au/item/q6x65/an-extreme-mass-ratio-short-period-eclipsing-binary-consisting-of-a-b-dwarf-primary-and-a-pre-main-sequence-m-star-companion-discovered-by-kelt
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