2010A&A...516A..33E


Query : 2010A&A...516A..33E

2010A&A...516A..33E - Astronomy and Astrophysics, volume 516, A33-33 (2010/6-2)

An improved method for estimating the masses of stars with transiting planets.

ENOCH B., COLLIER CAMERON A., PARLEY N.R. and HEBB L.

Abstract (from CDS):

To determine the physical parameters of a transiting planet and its host star from photometric and spectroscopic analysis, it is essential to independently measure the stellar mass. This is often achieved by the use of evolutionary tracks and isochrones, but the mass result is only as reliable as the models used. The recent paper by Torres et al. (2010A&ARv..18...67T) showed that accurate values for stellar masses and radii could be obtained from a calibration using Teff, logg and [Fe/H]. We investigate whether a similarly good calibration can be obtained by substituting log ρ - the fundamental parameter measured for the host star of a transiting planet - for logg, and apply this to star-exoplanet systems. We perform a polynomial fit to stellar binary data provided in Torres et al. (2010A&ARv..18...67T) to obtain the stellar mass and radius as functions of Teff, logρ and [Fe/H], with uncertainties on the fit produced from a Monte Carlo analysis. We apply the resulting equations to measurements for seventeen SuperWASP host stars, and also demonstrate the application of the calibration in a Markov Chain Monte Carlo analysis to obtain accurate system parameters where spectroscopic estimates of effective stellar temperature and metallicity are available. We show that the calibration using log ρ produces accurate values for the stellar masses and radii; we obtain masses and radii of the SuperWASP stars in good agreement with isochrone analysis results. We ascertain that the mass calibration is robust against uncertainties resulting from poor photometry, although a good estimate of stellar radius requires good-quality transit light curve to determine the duration of ingress and egress.

Abstract Copyright:

Journal keyword(s): planetary systems

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 WASP-1 V* 00 20 40.0745768856 +31 59 23.954809596   12.06 11.31     F7V 109 1
2 HD 10069 * 01 37 25.0332798696 -45 40 40.374717456   9.74 9.30     F6IV/V 188 1
3 WASP-11 ** 03 09 28.5433589520 +30 40 24.862993356   12.58 11.57 11.42   K3V 75 1
4 WASP-12 ** 06 30 32.7966092352 +29 40 20.263502460   12.14 11.57     G0V 272 2
5 BD+34 1976b Pl 09 20 24.7143829845 +33 52 56.699778302           ~ 50 1
6 BD+34 1976 V* 09 20 24.7145388600 +33 52 56.696039796   11.21 10.42     G1V 61 1
7 WASP-19 V* 09 53 40.0765648584 -45 39 33.057187596   13.05 12.31 12.12 11.35 G8V 157 2
8 CD-31 10766 * 13 55 42.7120177608 -32 09 34.616222028   11.396 10.910     F7 62 1
9 WASP-16 * 14 18 43.9225013904 -20 16 31.843626168   12.51 11.29 11.00 10.49 G3V 61 1
10 BD+22 2716 * 14 33 06.3571702344 +21 53 40.981395876   10.194 9.745     F5V 89 1
11 CD-27 10695 * 15 59 50.9491505016 -28 03 42.312819096   11.83 11.59 11.31 10.92 F4 100 1
12 BD+35 3293 V* 18 34 31.6252443960 +35 39 41.491899468   11.07 10.63 10.52   F7V 118 1
13 WASP-2 V* 20 30 54.1282355304 +06 25 46.341284844   13 11.98     K1.5 126 1
14 HD 197286 PM* 20 44 10.2208462488 -39 13 30.855881604   9.98 9.50     F5V 71 1
15 HD 209458 V* 22 03 10.7727465312 +18 53 03.549393384   8.21 7.63     F9V 1051 1
16 WASP-6 * 23 12 37.7368282608 -22 40 26.273805024   12.90 11.91     G8V 81 1
17 WASP-10 V* 23 15 58.3006181424 +31 27 46.296056268   12.4   12.03   K5V 81 1
18 WASP-4 PM* 23 34 15.0857248317 -42 03 41.047972591   13.51 12.48 11.9   G7V 151 1
19 WASP-5 V* 23 57 23.7564672192 -41 16 37.743700800   12.808 12.146 12.058 11.44 G4V 105 1

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2022.08.10-06:32:40

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