학술논문
A low-mass eclipsing binary within the fully convective zone from the NGTS
Document Type
Working Paper
Author
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, Ph.; Guenther, Maximilian N.; Jenkins, J. S.; McCormac, J.; Moyano, M.; Queloz, D.; Smith, A. M. S.; West, R. G.; Wheatley, P. J.
Source
Subject
Language
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.
Comment: 12 pages, 9 Figures, Accepted for publication in MNRAS
Comment: 12 pages, 9 Figures, Accepted for publication in MNRAS