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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, A. H. M. J.; Hebb, L.; Anderson, D. R.; Cargile, P.; Collier Cameron, A.; Doyle, A. P.; Faedi, F.; Gillon, M.; Gomez Maqueo Chew, Y.; Hellier, C.; Jehin, E.; Maxted, P.; Naef, D.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Stassun, K.; Udry, S.; West, R. G.

Authors

A. H. M. J. Triaud

L. Hebb

D. R. Anderson

P. Cargile

A. Collier Cameron

A. P. Doyle

F. Faedi

M. Gillon

Y. Gomez Maqueo Chew

E. Jehin

D. Naef

F. Pepe

D. Pollacco

D. Queloz

D. Ségransan

K. Stassun

S. Udry

R. G. West



Abstract

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 have projected spin-orbit angles aligned with their primaries’ rotation. 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.

Citation

Triaud, A. H. M. J., Hebb, L., Anderson, D. R., Cargile, P., Collier Cameron, A., Doyle, A. P., …West, R. G. (2013). 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. Astronomy & Astrophysics, 549, A18. https://doi.org/10.1051/0004-6361/201219643

Journal Article Type Article
Online Publication Date Dec 7, 2012
Publication Date 2013-01
Deposit Date Jun 16, 2023
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 549
Pages A18
DOI https://doi.org/10.1051/0004-6361/201219643
Keywords Space and Planetary Science; Astronomy and Astrophysics; binaries: eclipsing / stars: individual: WASP-30 / techniques: radial velocities / stars: individual: J1219-39 / stars: low-mass / brown dwarfs