Reference : The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/214310
The EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
English
von Boetticher, Alexander mailto [Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK ; Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK]
Triaud, Amaury H. M. J. [Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK]
Queloz, Didier [Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK; Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Gill, Sam [Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK]
Lendl, Monika [Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042, Graz, Austria; Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany]
Delrez, Laetitia [Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK; Université de Liège, Allée du 6 août 17, Sart Tilman, 4000, Liège 1, Belgium]
Anderson, David R. [Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK]
Collier Cameron, Andrew [SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, KY16 9SS, St Andrews, Fife, UK]
Faedi, Francesca [Department of Physics, University of Warwick, Coventry, CV4 7AL, UK]
Gillon, Michaël mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Gómez Maqueo Chew, Yilen [Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, Ciudad de México, México]
Hebb, Leslie [Hobart and William Smith Colleges, Department of Physics, Geneva, NY, 14456, USA]
Hellier, Coel [Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK]
Jehin, Emmanuel mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Maxted, Pierre F. L. [Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK]
Martin, David V. [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Pepe, Francesco [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Pollacco, Don [Department of Physics, University of Warwick, Coventry, CV4 7AL, UK]
Ségransan, Damien [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Smalley, Barry [Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK]
Udry, Stéphane [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
West, Richard [Department of Physics, University of Warwick, Coventry, CV4 7AL, UK)]
1-Aug-2017
Astronomy and Astrophysics
EDP Sciences
604
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] binaries: eclipsing ; binaries: spectroscopic ; stars: low-mass ; techniques: spectroscopic ; techniques: photometric ; stars: individual: EBLM J0555-57Ab
[en] 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 M[SUB]Jup[/SUB] (0.081 M[SUB]⊙[/SUB]) and a radius of 0.84[SUP]+ 0.14[/SUP][SUB]-0.04[/SUB]R[SUB]Jup[/SUB] (0.084 R[SUB]⊙[/SUB]) that is comparable to that of Saturn. EBLM J0555-57Ab has a surface gravity log g[SUB]2[/SUB] =5.50[SUP]+ 0.03[/SUP][SUB]-0.13[/SUB] 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="http://130.79.128.5">http://130.79.128.5</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>
http://hdl.handle.net/2268/214310
10.1051/0004-6361/201731107
http://adsabs.harvard.edu/abs/2017A%26A...604L...6V

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