文章基本信息

标题：The EBLM project - III. A Saturn-size low-mass star at the hydrogen-burning limit
其他标题：III. A Saturn-size low-mass star at the hydrogen-burning limit⋆
本地全文：下载
作者：Alexander von Boetticher ; Alexander von Boetticher ; Amaury H. M. J. Triaud 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：604
页码：1-6
DOI：10.1051/0004-6361/201731107
语种：English
出版社：EDP Sciences
摘要：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.
关键词：enbinaries: eclipsingbinaries: spectroscopicstars: low-masstechniques: spectroscopictechniques: photometricstars: individual: EBLM J0555-57Ab