von Boetticher, A, Triaud, AHMJ, Queloz, D, Gill, S, Lendl, M, Delrez, L, Anderson, DR, Collier Cameron, A, Faedi, F, Gillon, M, Gómez Maqueo Chew, Y, Hebb, L, Hellier, C ORCID: https://orcid.org/0000-0002-3439-1439, Jehin, E, Maxted, PFL, Martin, DV, Pepe, F, Pollacco, D, Ségransan, D, Smalley, B, Udry, S and West, R (2017) The EBLM project - III. A Saturn-size low-mass star at the hydrogen-burning limit. Astronomy & Astrophysics, 604. L6 -L6.

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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 MJup (0.081 M⊙) and a radius of 0.84+ 0.14-0.04RJup (0.084 R⊙) that is comparable to that of Saturn. EBLM J0555-57Ab has a surface gravity log g2 =5.50+ 0.03-0.13 and is one of the densest non-stellar-remnant objects currently known. These measurements are consistent with models of low-mass stars.

Item Type: Article
Additional Information: © EDP Sciences. This is the final published version of the article (version of record). It first appeared online via EDP Sciences at https://doi.org/10.1051/0004-6361/201731107 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: binaries, eclipsing, spectroscopic, stars, low-mass, techniques, spectroscopic, photometric, EBLM J0555-57Ab
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 05 Sep 2017 11:22
Last Modified: 19 Mar 2019 12:32
URI: https://eprints.keele.ac.uk/id/eprint/3990

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