We present the discovery of NGTS J0930-18, an extreme mass ratio eclipsing M-dwarf binary system with an early M-dwarf primary and a late M-dwarf secondary close to the hydrogen burning limit. Global modelling of photometry and radial velocities reveals that the secondary component (NGTS J0930-18 B) has a mass of M=0.0818−0.0015+0.0040M∗ and radius of R=0.1059−0.0021+0.0023R∗, making it one of the lowest mass stars with direct mass and radius measurements. With a mass ratio of q =0.1407−0.017+0.0065, NGTS J0930-18 has the lowest mass ratio of any known eclipsing M-dwarf binary system, posing interesting questions for binary star formation and evolution models. The mass and radius of NGTS J0930-18 B is broadly consistent with stellar evolutionary models. NGTS J0930-18 B lies in the sparsely populated mass radius parameter space close to the substellar boundary. Precise measurements of masses and radii from single lined eclipsing binary systems of this type are vital for constraining the uncertainty in the mass-radius relationship - of importance due to the growing number of terrestrial planets being discovered around low mass stars.
@article{arxiv.2008.07354,
title = {An eclipsing M-dwarf close to the hydrogen burning limit from NGTS},
author = {Jack S. Acton and Michael R. Goad and Sarah L. Casewell and José I. Vines and Matthew R. Burleigh and Phillip Eigmüller and Louise D. Nielsen and Boris T. Gänsicke and Daniel Bayliss and François Bouchy and Edward M. Bryant and Samuel Gill and Edward Gillen and Maximilian N. Günther and James S. Jenkins and James McCormac and Maximiliano Moyano and Liam R. Raynard and Rosanna H. Tilbrook and Stéphane Udry and Christopher A. Watson and Richard G. West and Peter J. Wheatley},
journal= {arXiv preprint arXiv:2008.07354},
year = {2020}
}