A low-mass eclipsing binary within the fully convective zone from the Next Generation Transit Survey

S. L. Casewell, L. Raynard, C. A. Watson, E. Gillen, E. de Mooij, D. Bayliss, F. Bouchy, A. Thompson, J. A. G. Jackman, M. R. Burleigh, A. Chaushev, C. Belardi, T. Louden, M. R. Goad, L. D. Nielsen, K. Poppenhaeger, Ph. Eigmueller, Maximilian N. Guenther, J. S. Jenkins, J. McCormacM. Moyano, D. Queloz, A. M. S. Smith, R. G. West, P. J. Wheatley

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Abstract

We have discovered a new, near-equal mass, eclipsing M dwarf binary from the Next Generation Transit Survey. This system is only one of 3 field age ($>$ 1 Gyr), late M dwarf eclipsing binaries known, and has a period of 1.74774 days, similar to that of CM~Dra and KOI126. Modelling of the eclipses and radial velocities shows that the component masses are $M_{\rm pri}$=0.17391$^{+0.00153}_{0.00099}$ $M_{\odot}$, $M_{\rm sec}$=0.17418$^{+0.00193}_{-0.00059}$ $M_{\odot}$; radii are $R_{\rm pri}$=0.2045$^{+0.0038}_{-0.0058}$ $R_{\odot}$, $R_{\rm sec}$=0.2168$^{+0.0047}_{-0.0048}$ $R_{\odot}$. The effective temperatures are $T_{\rm pri} = 2995\,^{+85}_{-105}$ K and $T_{\rm sec} = 2997\,^{+66}_{-101}$ K, consistent with M5 dwarfs and broadly consistent with main sequence models. This pair represents a valuable addition which can be used to constrain the mass-radius relation at the low mass end of the stellar sequence.
Original languageEnglish
Pages (from-to)1897–1907
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume481
Issue number2
Early online date13 Sep 2018
DOIs
Publication statusPublished - 01 Dec 2018

Keywords

  • Astrophysics - Solar and Stellar Astrophysics

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    Casewell, S. L., Raynard, L., Watson, C. A., Gillen, E., de Mooij, E., Bayliss, D., Bouchy, F., Thompson, A., Jackman, J. A. G., Burleigh, M. R., Chaushev, A., Belardi, C., Louden, T., Goad, M. R., Nielsen, L. D., Poppenhaeger, K., Eigmueller, P., Guenther, M. N., Jenkins, J. S., ... Wheatley, P. J. (2018). A low-mass eclipsing binary within the fully convective zone from the Next Generation Transit Survey. Monthly Notices of the Royal Astronomical Society, 481(2), 1897–1907. https://doi.org/10.1093/mnras/sty2183