2011MNRAS.416.2593B


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET14:13:02

2011MNRAS.416.2593B - Mon. Not. R. Astron. Soc., 416, 2593-2599 (2011/October-1)

A lower mass for the exoplanet WASP-21b.

BARROS S.C.C., POLLACCO D.L., GIBSON N.P., HOWARTH I.D., KEENAN F.P., SIMPSON E.K., SKILLEN I. and STEELE I.A.

Abstract (from CDS):

We present high-precision transit observations of the exoplanet WASP-21b, obtained with the Rapid Imager to Search for Exoplanets instrument mounted on the 2.0-m Liverpool Telescope. A transit model is fitted, coupled with a Markov chain Monte Carlo routine, to derive accurate system parameters. The two new high-precision transits allow us to estimate the stellar density directly from the light curve. Our analysis suggests that WASP-21 is evolving off the main sequence which led to a previous overestimation of the stellar density. Using isochrone interpolation, we find a stellar mass of 0.86 ± 0.04 M, which is significantly lower than previously reported (1.01 ±0.03 M). Consequently, we find a lower planetary mass of 0.27 ±0.01 MJup. A lower inclination (87°4±0°3) is also found for the system than previously reported, resulting in a slightly larger stellar (R*= 1.10±0.03 R) and planetary radius (Rp= 1.14±0.04 RJup). The planet radius suggests a hydrogen/helium composition with no core which strengthens the correlation between planetary density and host star metallicity. A new ephemeris is determined for the system, i.e. T0= 245 5084.519 74±0.000 20 (HJD) and P= 4.322 5060±0.000 0031 d. We found no transit timing variations in WASP-21b.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): methods: data analysis - methods: observational - techniques: photometric - stars: individual: WASP-21 - planetary systems

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 - 2021
#notes
1 WASP-39 * 14 29 18.4151765921 -03 26 40.203046112   12.93 12.09 12.17 11.29 ~ 35 1
2 WASP-37 * 14 47 46.5618120089 +01 03 53.802386624   13.304 12.704 12.87 12.24 G2V 26 1
3 HAT-P-27 * 14 51 04.1870409044 +05 56 50.548178856   13.18 12.19 11.98 11.23 G8 44 1
4 WASP-21b Pl 23 09 58.2534148377 +18 23 45.882492621           ~ 44 1
5 WASP-21 * 23 09 58.2534148377 +18 23 45.882492621   12.12 11.55 11.52   G3V 40 1

    Equat.    Gal    SGal    Ecl

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2020.12.02-14:13:02

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