2021MNRAS.506..306S

Query : 2021MNRAS.506..306S

2021MNRAS.506..306S - Mon. Not. R. Astron. Soc., 506, 306-322 (2021/September-1)

The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves.

SWAYNE M.I., MAXTED P.F.L., TRIAUD A.H.M.J., SOUSA S.G., BROEG C., FLOREN H.-G., GUTERMAN P., SIMON A.E., BOISSE I., BONFANTI A., MARTIN D., SANTERNE A., SALMON S., STANDING M.R., VAN GROOTEL V., WILSON T.G., ALIBERT Y., ALONSO R., ANGLADA ESCUDE G., ASQUIER J., BARCZY T., BARRADO D., BARROS S.C.C., BATTLEY M., BAUMJOHANN W., BECK M., BECK T., BEKKELIEN A., BENZ W., BILLOT N., BONFILS X., BRANDEKER A., BUSCH M.-D., CABRERA J., CHARNOZ S., COLLIER CAMERON A., CSIZMADIA S., DAVIES M.B., DELEUIL M., DELINE A., DELREZ L., DEMANGEON O.D.S., DEMORY B.-O., DRANSFIELD G., EHRENREICH D., ERIKSON A., FORTIER A., FOSSATI L., FRIDLUND M., FUTYAN D., GANDOLFI D., GILLON M., GUEDEL M., HEBRARD G., HEIDARI N., HELLIER C., HENG K., HOBSON M., HOYER S., ISAAK K.G., KISS L., KUNOVAC HODZIC V., LALITHA S., LASKAR J., LECAVELIER DES ETANGS A., LENDL M., LOVIS C., MAGRIN D., MARAFATTO L., McCORMAC J., MILLER N., NASCIMBENI V., OLOFSSON G., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., RIBAS I., SANTOS N.C., SCANDARIATO G., SEGRANSAN D., SMITH A.M.S., STEINBERGER M., STELLER M., SZABO G.M., THOMAS N., UDRY S., WALTER I., WALTON N.A. and WILLETT E.

Abstract (from CDS):

The accuracy of theoretical mass, radius, and effective temperature values for M-dwarf stars is an active topic of debate. Differences between observed and theoretical values have raised the possibility that current theoretical stellar structure and evolution models are inaccurate towards the low-mass end of the main sequence. To explore this issue, we use the CHEOPS satellite to obtain high-precision light curves of eclipsing binaries with low-mass stellar companions. We use these light curves combined with the spectroscopic orbit for the solar-type companion to measure the mass, radius, and effective temperature of the M-dwarf star. Here, we present the analysis of three eclipsing binaries. We use the PYCHEOPS data analysis software to fit the observed transit and eclipse events of each system. Two of our systems were also observed by the TESS satellite - we similarly analyse these light curves for comparison. We find consistent results between CHEOPS and TESS, presenting three stellar radii and two stellar effective temperature values of low-mass stellar objects. These initial results from our on-going observing programme with CHEOPS show that we can expect to have ∼24 new mass, radius, and effective temperature measurements for very low-mass stars within the next few years.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: spectroscopic - binaries: eclipsing - stars: fundamental parameters - stars: low-mass

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

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 - 2026 		#notes
1 NAME L 320-124b Pl 10 14 51.7786855411 -47 09 24.192778106           ~ 223 0
2 V* CM Dra BY* 16 34 20.3302660573 +57 09 44.368918696   14.50 12.87 10.85 9.26 M4.5V 467 0
3 TYC 2606-1838-1 SB* 17 41 21.2705996376 +31 24 55.245067560   12.11 11.70     F7 7 0
4 UCAC2 13875304 SB* 19 34 25.6914014040 -42 23 11.978701836   13.38 12.62 12.57 11.82 ~ 11 0
5 TYC 524-2528-1 SB* 20 46 43.8759722040 +06 18 09.706470732   10.48 9.86     ~ 10 0

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