The EBLM Project. V. Physical properties of ten fully convective, very-low-mass stars

stars: low-mass; binaries: eclipsing; binaries: spectroscopic; techniques: spectroscopic; techniques: photometric; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics

Abstract :

[en] Measurements of the physical properties of stars at the lower end of the main sequence are scarce. In this context we report masses, radii and surface gravities of ten very-low-mass stars in eclipsing binary systems, with orbital periods of the order of several days. The objects probe the stellar mass-radius relation in the fully convective regime, M[SUB]⋆[/SUB] ≲ 0.35 M[SUB]☉[/SUB], down to the hydrogen burning mass- limit, M[SUB]HB[/SUB] ̃ 0.07 M[SUB]☉[/SUB]. The stars were detected by the WASP survey for transiting extra-solar planets, as low-mass, eclipsing companions orbiting more massive, F- and G-type host stars. We use eclipse observations of the host stars, performed with the TRAPPIST, Leonhard Euler and SPECULOOS telescopes, and radial velocities of the host stars obtained with the CORALIE spectrograph, to determine the physical properties of the low-mass companions. Surface gravities of the low-mass companions are derived from the eclipse and orbital parameters of each system. Spectroscopic measurements of the host star effective temperature and metallicity are used to infer the host star mass and age from stellar evolution models for solar-type stars. Masses and radii of the low-mass companions are then derived from the eclipse and orbital parameters of the binary systems. The objects are compared to stellar evolution models for low-mass stars, to test for an effect of the stellar metallicity and orbital period on the radius of low-mass stars in close binary systems. Measurements are found to be in good agreement with stellar evolution models; a systematic inflation of the radius of low-mass stars with respect to model predictions is limited to 1.6 ± 1.2%, in the fully convective low-mass regime. The sample of ten objects indicates a scaling of the radius of low-mass stars with the host star metallicity. No correlation between stellar radii and the orbital periods of the binary systems is determined. A combined analysis with thirteen comparable objects from the literature is consistent with this result. The eclipse and radial velocity data are available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/625/A150">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/625/A150</A>

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

von Boetticher, Alexander; Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK ; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK

Triaud, Amaury H. M. J.; School of Physics & Astronomy, University of Birmingham, Edgabston, Birmingham, B15 2TT, UK ; Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK

Queloz, Didier; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK ; Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland

Gill, Samuel; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK

Maxted, Pierre F. L.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK

Almleaky, Yaseen; King Abdullah Centre for Crescent Observations and Astronomy, Makkah Clock, Mecca, 24231, Saudi Arabia

Anderson, David R.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK

Bouchy, François; Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland

Burdanov, Artem ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic

Collier Cameron, Andrew; SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, KY16 9SS, St Andrews, Fife, UK

More authors (21 more)

Language :

English

Title :

The EBLM Project. V. Physical properties of ten fully convective, very-low-mass stars

Publication date :

01 May 2019

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

625

Pages :

A150

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://ui.adsabs.harvard.edu/abs/2019A&A...625A.150V

Available on ORBi :

since 26 July 2019

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