A 0.24+0.18 M double-lined eclipsing binary from the HATSouth survey

Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 and Bayliss, D. and Hartman, J. D. and Rabus, M. and Bakos, G. A. and Jordan, A. and Brahm, R. and Penev, K. and Csubry, Z. and Mancini, L. and Espinoza, N. and de Val-Borro, M. and Bhatti, W. and Ciceri, S. and Henning, T. and Schmidt, B. and Murphy, S. J. and Butler, R. P. and Arriagada, P. and Shectman, S. and Crane, J. and Thompson, I. and Suc, V. and Noyes, R. W. (2015) A 0.24+0.18 M double-lined eclipsing binary from the HATSouth survey. Monthly Notices of the Royal Astronomical Society, 451 (3). pp. 2263-2277. ISSN 0035-8711

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We report the discovery and characterization of a new M-dwarf binary, with component masses and radii of M1 = 0.244+0.003-0.003 M⊙, R1 = 0.261+0.006-0.009 R⊙, M2 = 0.179+0.002-0.001 M⊙, R2 = 0.218+0.007-0.011 R⊙, and orbital period of ~4.1 d. The M-dwarf binary HATS551-027 (LP 837-20) was identified as an eclipsing binary by the HATSouth survey, and characterized by a series of high-precision photometric observations of the eclipse events, and spectroscopic determinations of the atmospheric parameters and radial velocity orbits. HATS551-027 is one of few systems with both stellar components lying in the fully convective regime of very low mass stars, and can serve as a test for stellar interior models. The radius of HATS551-027A is consistent with models to 1σ, whilst HATS551-027B is inflated by 9 per cent at 2σ significance. We measure the effective temperatures for the two stellar components to be Teff, 1 = 3190 ± 100 K and Teff, 2 = 2990 ± 110 K; both are slightly cooler than theoretical models predict, but consistent with other M-dwarfs of similar masses that have previously been studied. We also measure significant H α emission from both components of the binary system, and discuss this in the context of the correlation between stellar activity and the discrepancies between the observed and model temperatures.

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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: 01 Feb 2022 01:40
Last Modified: 02 Feb 2022 04:23
Uncontrolled Keywords: Binaries: eclipsing; Stars: individual: HATS551-027; 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/10.1093/mnras/stv1070
URI: http://eprints.usq.edu.au/id/eprint/45044

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