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

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Date
01/08/2017
Author
Von Boetticher, Alexander
Triaud, Amaury H.M.J.
Queloz, DIdier
Gill, Sam
Lendl, Monika
Delrez, Laetitia
Anderson, David R.
Cameron, Andrew Collier
Faedi, Francesca
Gillon, Michaël
Chew, Yilen Gómez Maqueo
Hebb, Leslie
Hellier, Coel
Jehin, Emmanuël
Maxted, Pierre F.L.
Martin, David V.
Pepe, Francesco
Pollacco, Don
Ségransan, Damien
Smalley, Barry
Udry, Stéphane
West, Richard
Keywords
Binaries: eclipsing
Binaries: spectroscopic
Stars: individual: EBLM J0555-57Ab
Stars: low-mass
Techniques: photometric
Techniques: spectroscopic
QB Astronomy
QC Physics
Astronomy and Astrophysics
Space and Planetary Science
DAS
Metadata
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Abstract
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.
Citation
Von Boetticher , A , Triaud , A H M J , Queloz , DI , Gill , S , Lendl , M , Delrez , L , Anderson , D R , Cameron , A C , Faedi , F , Gillon , M , Chew , Y G M , Hebb , L , Hellier , C , Jehin , E , Maxted , P F L , Martin , D V , Pepe , F , Pollacco , D , Ségransan , D , Smalley , B , Udry , S & West , R 2017 , ' The EBLM project : III. A Saturn-size low-mass star at the hydrogen-burning limit ' , Astronomy & Astrophysics , vol. 604 , L6 . https://doi.org/10.1051/0004-6361/201731107
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201731107
ISSN
0004-6361
Type
Journal article
Rights
© ESO, 2017. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1051/0004-6361/201731107
Description
This work was partially supported by a grant from the Simons Foundation (PI Queloz, grant number 327127).
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  • University of St Andrews Research
URL
https://arxiv.org/abs/1706.08781
URI
http://hdl.handle.net/10023/11943

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