2019A&A...626A.119G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST20:13:46

2019A&A...626A.119G - Astronomy and Astrophysics, volume 626A, 119-119 (2019/6-1)

The EBLM project. VI. Mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey.

GILL S., MAXTED P.F.L., EVANS J.A., EVANS D.F., SOUTHWORTH J., SMALLEY B., GARY B.L., ANDERSON D.R., BOUCHY F., CAMERON A.C., DOMINIK M., FAEDI F., GILLON M., GOMEZ MAQUEO CHEW Y., HEBB L., HELLIER C., JORGENSEN U.G., LONGA-PENA P., MARTIN D.V., McCORMAC J., PEPE F.V., POLLACO D., QUELOZ D., SEGRANSAN D., SNODGRASS C., TURNER O.D., TRIAUD A.H.M., UDRY S. and WEST R.G.

Abstract (from CDS):

Some M-dwarfs around F-/G-type stars have been measured to be hotter and larger than predicted by stellar evolution models. Inconsistencies between observations and models need to be addressed with more mass, radius, and luminosity measurements of low-mass stars to test and refine evolutionary models. Our aim is to measure the masses, radii and ages of the stars in five low-mass eclipsing binary systems discovered by the WASP survey. We used WASP photometry to establish eclipse-time ephemerides and to obtain initial estimates for the transit depth and width. Radial velocity measurements were simultaneously fitted with follow-up photometry to find the best-fitting orbital solution. This solution was combined with measurements of atmospheric parameters to interpolate evolutionary models and estimate the mass of the primary star, and the mass and radius of the M-dwarf companion. We assess how the best fitting orbital solution changes if an alternative limb-darkening law is used and quantify the systematic effects of unresolved companions. We also gauge how the best-fitting evolutionary model changes if different values are used for the mixing length parameter and helium enhancement. We report the mass and radius of five M-dwarfs and find little evidence of inflation with respect to evolutionary models. The primary stars in two systems are near the "blue hook" stage of their post sequence evolution, resulting in two possible solutions for mass and age. We find that choices in helium enhancement and mixing-length parameter can introduce an additional 3-5% uncertainty in measured M-dwarf mass. Unresolved companions can introduce an additional 3-8% uncertainty in the radius of an M-dwarf, while the choice of limb-darkening law can introduce up to an additional 2% uncertainty. The choices in orbital fitting and evolutionary models can introduce significant uncertainties in measurements of physical properties of such systems.

Abstract Copyright: © ESO 2019

Journal keyword(s): binaries: eclipsing - stars: atmospheres

VizieR on-line data: <Available at CDS (J/A+A/626/A119): table1.dat rv.dat saao.dat ctio.dat hao.dat wasp.dat list.dat fits/*>

CDS comments: Paragraph 4.2 Gaia DR2 6539811294185397120 not found in the catalogue. Paragraph 4.3 Gaia DR2 4971670729566470528 not found in the catalogue. Paragraph 4.4 Gaia DR2 2098283457595740288 not found in the catalogue.

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [VV2006] J005557.0-000217 QSO 00 55 57.0463389659 -00 02 17.312253938   20.33 20.13     ~ 13 0
2 TYC 2291-1627-1 EB* 01 13 51.3287044639 +31 49 10.126092759   10.61 10.11     M 9 0
3 Gaia DR2 4971670935725243904 * 02 18 11.2948811932 -31 04 34.292092742           ~ 1 0
4 HD 14326 SB* 02 18 13.2449489109 -31 05 17.389136788   10.510 9.914 9.57 9.338 G0V 9 0
5 CD-57 1311 * 05 55 32.6868 -57 17 26.064   10.456 9.934     ~ 9 0
6 TYC 245-630-1 * 10 13 50.8313966207 +01 59 28.231457498   12.05 11.87     ~ 4 0
7 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 958 0
8 UCAC2 26899058 * 14 36 46.4121286568 -13 32 35.558792182   12.986 12.480 12.79 11.79 ~ 3 0
9 NVSS J154740+395438 Rad 15 47 40.2 +39 54 38           ~ 5 1
10 PMN J1652-1941 Rad 16 52 30.70 -19 41 38.2           ~ 2 1
11 Gaia DR2 2098283457595821440 * 18 47 52.0498896409 +39 58 38.915264622           ~ 1 0
12 TYC 3122-289-1 * 18 47 52.3591054133 +39 58 51.103455511   12.08 11.72     ~ 2 0
13 Kepler-16 Al* 19 16 18.1759181246 +51 45 26.777781114   12.1   11.90   K7V 194 1
14 KOI-362 EB* 19 23 59.2555289669 +37 11 57.176277204       13.78   ~ 27 2
15 TYC 5228-989-1 Al* 22 17 58.1308248645 -04 51 52.887582178   12.44 12.18     ~ 5 0
16 TRAPPIST-1 LM* 23 06 29.3684052886 -05 02 29.031690445     18.798 16.466 14.024 M7.5e 480 0
17 Gaia DR2 6539811500344886016 * 23 08 43.4134748966 -46 06 31.720777276           ~ 1 0
18 Gaia DR2 6539811289890737408 * 23 08 44.6642964629 -46 06 54.954465537           ~ 1 0
19 TYC 8448-418-1 * 23 08 45.6742586062 -46 06 36.721608609   11.73 11.35     ~ 3 0
20 Gaia DR2 6539817204061452544 * 23 08 47.4486474927 -46 05 53.040326046           ~ 1 0
21 Gaia DR2 2314099173307737088 * 23 49 13.9162139613 -32 46 36.530438913           ~ 1 0
22 TYC 7519-142-1 SB* 23 49 15.2395107281 -32 46 17.465477759   12.14 11.52     ~ 3 0
23 WASP-30b BD? 23 53 38.054 -10 07 05.12           ~ 32 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-20:13:46

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