The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit

[en] We report the discovery of an eclipsing binary system with mass-ratio q ˜ 0.07. After identifying a periodic photometric signal received by WASP, we obtained CORALIE spectroscopic radial velocities and follow-up light curves with the Euler and TRAPPIST telescopes. From a joint fit of these data we determine that EBLM J0555-57 consists of a sun-like primary star that is eclipsed by a low-mass companion, on a weakly eccentric 7.8-day orbit. Using a mass estimate for the primary star derived from stellar models, we determine a companion mass of 85 ± 4 M[SUB]Jup[/SUB] (0.081 M[SUB]⊙[/SUB]) and a radius of 0.84[SUP]+ 0.14[/SUP][SUB]-0.04[/SUB]R[SUB]Jup[/SUB] (0.084 R[SUB]⊙[/SUB]) that is comparable to that of Saturn. EBLM J0555-57Ab has a surface gravity log g[SUB]2[/SUB] =5.50[SUP]+ 0.03[/SUP][SUB]-0.13[/SUB] and is one of the densest non-stellar-remnant objects currently known. These measurements are consistent with models of low-mass stars. The photometry tables and radial velocities are only available at the CDS and on demand via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/L6">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/L6</A>

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

von Boetticher, Alexander; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK ; Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK

Triaud, Amaury H. M. J.; 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, ST55, BG, UK

Lendl, Monika; Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042, Graz, Austria ; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany

Delrez, Laetitia ; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK ; Université de Liège, Allée du 6 août 17, Sart Tilman, 4000, Liège 1, Belgium

Anderson, David R.; Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK

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

Faedi, Francesca; Department of Physics, University of Warwick, Coventry, CV4 7AL, UK

Gillon, Michaël ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)

More authors (12 more)

Language :

English

Title :

The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit

Publication date :

01 August 2017

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

604

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2017A%26A...604L...6V

Available on ORBi :

since 17 September 2017

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