Publication:
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

Issued Date

2020-12-01

Resource Type

Article

ISSN

13652966
00358711

DOI

10.1093/mnras/staa3142

Other identifier(s)

2-s2.0-85097042276

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Monthly Notices of the Royal Astronomical Society. Vol.499, No.3 (2020), 3775-3791

Suggested Citation

Daniel J. Stevens, George Zhou, Marshall C. Johnson, Aaron C. Rizzuto, Joseph E. Rodriguez, Allyson Bieryla, Karen A. Collins, Steven Villanueva, Jason T. Wright, B. Scott Gaudi, David W. Latham, Thomas G. Beatty, Michael B. Lund, Robert J. Siverd, Adam L. Kraus, Patcharapol Wachiraphan, Perry Berlind, Michael L. Calkins, Gilbert A. Esquerdo, John F. Kielkopf, Rudolf B. Kuhn, Mark Manner, Joshua Pepper, Keivan G. Stassun 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. Monthly Notices of the Royal Astronomical Society. Vol.499, No.3 (2020), 3775-3791. doi:10.1093/mnras/staa3142 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/60460

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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

Author(s)

Daniel J. Stevens
 George Zhou
 Marshall C. Johnson
 Aaron C. Rizzuto
 Joseph E. Rodriguez
 Allyson Bieryla
 Karen A. Collins
 Steven Villanueva
 Jason T. Wright
 B. Scott Gaudi
 David W. Latham
 Thomas G. Beatty
 Michael B. Lund
 Robert J. Siverd
 Adam L. Kraus
 Patcharapol Wachiraphan
 Perry Berlind
 Michael L. Calkins
 Gilbert A. Esquerdo
 John F. Kielkopf
 Rudolf B. Kuhn
 Mark Manner
 Joshua Pepper
 Keivan G. Stassun

Other Contributor(s)

MIT Kavli Institute for Astrophysics and Space Research
 Las Cumbres Observatory Global Telescope Network, Inc
 Gemini Observatory
 California Institute of Technology
 Harvard-Smithsonian Center for Astrophysics
 University of Louisville
 The University of Texas at Austin
 Mahidol University
 The University of Arizona
 Vanderbilt University
 The Ohio State University
 South African Astronomical Observatory
 Pennsylvania State University
 Fisk University
 Lehigh University
 Spot Observatory
 Observatory

Abstract

© 2020 The Author(s) 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.

Keyword(s)

Earth and Planetary Sciences

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/60460

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Scopus 2020