A Bright Short Period M-M Eclipsing Binary from the KELT Survey: Magnetic Activity and the Mass–Radius Relationship for M Dwarfs

Lubin, Jack B. and Rodriguez, Joseph E. and Zhou, George ORCID: https://orcid.org/0000-0002-4891-3517 and Conroy, Kyle E. and Stassun, Keivan G. and Collins, Karen and Stevens, Daniel J. and Labadie-Bartz, Jonathan and Stockdale, Christopher and Myers, Gordon and Colon, Knicole D. and Bento, Joao and Kehusmaa, Petri and Petrucci, Romina and Jofre, Emiliano and Quinn, Samuel N. and Lund, Michael B. and Kuhn, Rudolf B. and Siverd, Robert J. and Beatty, Thomas G. and Harlingten, Caisey and Pepper, Joshua and Gaudi, B. Scott and James, David and Jensen, Eric L. N. and Reichart, Daniel and Kedziora-Chudczer, Lucyna and Bailey, Jeremy and Melville, Graeme (2017) A Bright Short Period M-M Eclipsing Binary from the KELT Survey: Magnetic Activity and the Mass–Radius Relationship for M Dwarfs. The Astrophysical Journal, 844 (2):134. pp. 1-12. ISSN 1538-4357

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We report the discovery of KELT J041621-620046, a moderately bright (J ∼ 10.2) M-dwarf eclipsing binary system at a distance of 39 ± 3 pc. KELT J041621-620046 was first identified as an eclipsing binary using observations from the Kilodegree Extremely Little Telescope (KELT) survey. The system has a short orbital period of ∼1.11 days and consists of components with M1 = 0.447+0.052-0.047 M⊙ and M2 = 0.399+0.046-0.042 M⊙ in nearly circular orbits. The radii of the two stars are R1 = 0.540+0.034-0.032 R⊙ and R2 = 0.453 &plummn; 0.017 R⊙. Full system and orbital properties were determined (to ∼10% error) by conducting an EBOP (Eclipsing Binary Orbit Program) global modeling of the high precision photometric and spectroscopic observations obtained by the KELT Follow-up Network. Each star is larger by 17%-28% and cooler by 4%-10% than predicted by standard (non-magnetic) stellar models. Strong Hα emission indicates chromospheric activity in both stars. The observed radii and temperature discrepancies for both components are more consistent with those predicted by empirical relations that account for convective suppression due to magnetic activity.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 27 Jan 2022 04:12
Last Modified: 02 Feb 2022 05:00
Uncontrolled Keywords: binaries: eclipsing; binaries: general; stars: low-mass; Astrophysics; Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-4357/aa7947
URI: http://eprints.usq.edu.au/id/eprint/45005

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