2017A&A...604L...6V

Query : 2017A&A...604L...6V

2017A&A...604L...6V - Astronomy and Astrophysics, volume 604, L6-6 (2017/8-1)

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

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., GOMEZ MAQUEO CHEW Y., HEBB L., HELLIER C., JEHIN E., MAXTED P.F.L., MARTIN D.V., PEPE F., POLLACCO D., SEGRANSAN D., SMALLEY B., UDRY S. and WEST R.

Abstract (from CDS):

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±4MJup (0.081M☉) and a radius of 0.84+0.14–0.04RJup (0.084R☉) that is comparable to that of Saturn. EBLM J0555-57Ab has a surface gravity logg2=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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: low-mass - techniques: spectroscopic - techniques: photometric - stars: individual: EBLM J0555-57Ab - stars: individual: EBLM J0555-57Ab

VizieR on-line data: <Available at CDS (J/A+A/604/L6): coralie1.dat coralie2.dat eulerl.dat eulers.dat trappist.dat>

Nomenclature: EBLM JHHMM+DD (No. J0555-57).

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 2MASS J05233822-1403022 BD* 05 23 38.2236232872 -14 03 02.017758240           L2.5 64 0
2 CD-57 1311 SB* 05 55 32.62392 -57 17 26.1312           ~ 22 0
3 EPIC 201702477.01 Pl? 11 40 57.7883247720 +03 40 53.646749112           ~ 15 0
4 CD-39 7570 SB* 12 19 21.0336457752 -39 51 25.585123356   11.10 10.32     K0V 20 0
5 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 994 0

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