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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742379.0, MPI für Astronomie / Publikationen_mpia
The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
Authors:von Boetticher, A.; Triaud, A. H. M. J.; Queloz, D.; Gill, S.; Lendl, M.; Delrez, L.; Anderson, D. R.; Collier Cameron, A.; Faedi, F.; Gillon, M.; Gómez Maqueo Chew, Y.; 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.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Start Page:id. L6 (6 pp)
Audience:Not Specified
Abstract / Description: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. The photometry tables and radial velocities are only available at the CDS and on demand via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href=""></A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/L6">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/L6</A>
Free Keywords:binaries: eclipsing; binaries: spectroscopic; stars: low-mass; techniques: spectroscopic; techniques: photometric; stars: individual: EBLM J0555-57Ab
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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