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An eclipsing M-dwarf close to the hydrogen burning limit from NGTS

Acton, Jack S and Goad, Michael R and Casewell, Sarah L and Vines, Jose I and Burleigh, Matthew R and Eigmüller, Philipp and Nielsen, Louise D and Gänsicke, Boris T. and Bayliss, Daniel and Bouchy, Francois and Bryant, Edward M and Gill, Samuel and Gillen, Edward and Günther, Maximilian N and Jenkins, James S and McCormac, James and Moyano, Maximiliano and Raynard, Liam R and Tilbrook, Rosanna H and Udry, Stéphane and Watson, Christopher A. and West, Richard G and Wheatley, Peter J (2020) An eclipsing M-dwarf close to the hydrogen burning limit from NGTS. Monthly Notices of the Royal Astronomical Society, 498 (3), pp. 3115-3124. Oxford University Press. doi: 10.1093/mnras/staa2513. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/498/3/3115/5894934

Abstract

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+0.0040−0.0015 M☉ and radius of R* = 0.1059+0.0023−0.0021 R☉, making it one of the lowest mass stars with direct mass and radius measurements. With a mass ratio of q = 0.1407+0.0065−0.017 , 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.

Item URL in elib:https://elib.dlr.de/136678/
Document Type:Article
Title:An eclipsing M-dwarf close to the hydrogen burning limit from NGTS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Acton, Jack SSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Goad, Michael RSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Casewell, Sarah LSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Vines, Jose IDepartamento de Astronomía, Universidad de Chile, Camino el Observatorio 1515, Las Condes, Casilla 36-D, 7591245, Santiago, ChileUNSPECIFIED
Burleigh, Matthew RSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Nielsen, Louise DGeneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Gänsicke, Boris T.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Bayliss, DanielDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Bouchy, FrancoisGeneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Bryant, Edward MDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gill, SamuelDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gillen, EdwardAstronomy Unit, Queen Mary University of London, Mile End Road, London E1 4NS, UKUNSPECIFIED
Günther, Maximilian NDepartment of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USAUNSPECIFIED
Jenkins, James SDepartamento de Astronomía, Universidad de Chile, Camino el Observatorio 1515, Las Condes, Casilla 36-D, 7591245, Santiago, ChileUNSPECIFIED
McCormac, JamesDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIED
Raynard, Liam RSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Tilbrook, Rosanna HSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Udry, StéphaneGeneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
West, Richard GDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Wheatley, Peter JDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Date:2020
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:498
DOI :10.1093/mnras/staa2513
Page Range:pp. 3115-3124
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:binaries: eclipsing; stars: low-mass; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:04 Nov 2020 08:47
Last Modified:04 Nov 2020 08:47

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