The EBLM Project I-Physical and orbital parameters, including spin-orbit angles, of two low-mass eclipsing binaries on opposite sides of the Brown Dwarf limit

Triaud, Amaury H. M. J.; Hebb, Leslie; Anderson, David R.; Cargile, Phill; Collier Cameron, Andrew; Doyle, Amanda P.; Faedi, Francesca; Gillon, Michaël; Gomez Maqueo Chew, Yilen; Hellier, Coel; Jehin, Emmanuel; Maxted, Pierre; Naef, Dominique; Pepe, Francesco; Pollacco, Don; Queloz, Didier; Ségransan, Damien; Smalley, Barry; Stassun, Keivan; Udry, Stéphane; West, Richard G.

doi:10.1051/0004-6361/201219643

Article (Scientific journals)

The EBLM Project I-Physical and orbital parameters, including spin-orbit angles, of two low-mass eclipsing binaries on opposite sides of the Brown Dwarf limit

Triaud, Amaury H. M. J.; Hebb, Leslie; Anderson, David R. et al.

2013 • In Astronomy and Astrophysics, 549, p. 18

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https://hdl.handle.net/2268/135087

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10.1051/0004-6361/201219643

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Keywords :

Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics

Abstract :

[en] This paper introduces a series of papers aiming to study the dozens of low mass eclipsing binaries (EBLM), with F, G, K primaries, that have been discovered in the course of the WASP survey. Our objects are mostly single-line binaries whose eclipses have been detected by WASP and were initially followed up as potential planetary transit candidates. These have bright primaries, which facilitates spectroscopic observations during transit and allows the study of the spin-orbit distribution of F, G, K+M eclipsing binaries through the Rossiter-McLaughlin effect. Here we report on the spin-orbit angle of WASP-30b, a transiting brown dwarf, and improve its orbital parameters. We also present the mass, radius, spin-orbit angle and orbital parameters of a new eclipsing binary, J1219-39b (1SWAPJ121921.03-395125.6, TYC 7760-484-1), which, with a mass of 95 +/- 2 Mjup, is close to the limit between brown dwarfs and stars. We find that both objects orbit in planes that appear aligned with their primaries' equatorial planes. Neither primaries are synchronous. J1219-39b has a modestly eccentric orbit and is in agreement with the theoretical mass--radius relationship, whereas WASP-30b lies above it.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Triaud, Amaury H. M. J.

Hebb, Leslie

Anderson, David R.

Cargile, Phill

Collier Cameron, Andrew

Doyle, Amanda P.

Faedi, Francesca

Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image

Gomez Maqueo Chew, Yilen

Hellier, Coel

More authors (11 more)

Language :

English

Title :

The EBLM Project I-Physical and orbital parameters, including spin-orbit angles, of two low-mass eclipsing binaries on opposite sides of the Brown Dwarf limit

Publication date :

01 January 2013

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

549

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2012arXiv1208.4940T

Commentary :

12 pages, 7 figures, data in appendices, A&A

Available on ORBi :

since 27 November 2012

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