# 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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

## 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 language English 1897–1907 11 Monthly Notices of the Royal Astronomical Society 481 2 13 Sep 2018 https://doi.org/10.1093/mnras/sty2183 Published - 01 Dec 2018

## Keywords

• Astrophysics - Solar and Stellar Astrophysics

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