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WASP-50 b: a hot Jupiter transiting a moderately active solar-type star
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(2011) WASP-50 b: a hot Jupiter transiting a moderately active solar-type star. Astronomy & Astrophysics, Vol.533 . Article No. A88. doi:10.1051/0004-6361/201117198 Research output not available from this repository, contact author.
Official URL: http://dx.doi.org/10.1051/0004-6361/201117198
Abstract
We report the discovery by the WASP transit survey of a giant planet in a close orbit (0.0295 +/- 0.0009 AU) around a moderately bright (V = 11.6, K = 10) G9 dwarf (0.89 +/- 0.08 M(circle dot), 0.84 +/- 0.03 R(circle dot)) in the Southern constellation Eridanus. Thanks to high-precision follow-up photometry and spectroscopy obtained by the telescopes TRAPPIST and Euler, the mass and size of this planet, WASP-50 b, are well constrained to 1.47 +/- 0.09 M(Jup) and 1.15 +/- 0.05 R(Jup), respectively. The transit ephemeris is 2 455 558.6120 (+/- 0.0002) + N x 1.955096 (+/- 0.000005) HJD(UTC). The size of the planet is consistent with basic models of irradiated giant planets. The chromospheric activity (log R'(HK) = -4.67) and rotational period (P(rot) = 16.3 +/- 0.5 days) of the host star suggest an age of 0.8 +/- 0.4 Gy that is discrepant with a stellar-evolution estimate based on the measured stellar parameters (p(*) = 1.48 +/- 0.10 rho(circle dot), T(eff) = 5400 +/- 100 K, [Fe/H] = -0.12 +/- 0.08) which favors an age of 7 +/- 3.5 Gy. This discrepancy could be explained by the tidal and magnetic influence of the planet on the star, in good agreement with the observations that stars hosting hot Jupiters tend to show faster rotation and magnetic activity. We measure a stellar inclination of 84(-31)(+6) deg, disfavoring a high stellar obliquity. Thanks to its large irradiation and the relatively small size of its host star, WASP-50 b is a good target for occultation spectrophotometry, making it able to constrain the relationship between hot Jupiters' atmospheric thermal profiles and the chromospheric activity of their host stars.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||
| Publisher: | EDP Sciences | ||||
| ISSN: | 0004-6361 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Volume: | Vol.533 | ||||
| Page Range: | Article No. A88 | ||||
| DOI: | 10.1051/0004-6361/201117198 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | UK's Science and Technology Facilities Council , Belgian Fund for Scientific Research (Fond National de la Recherche Scientifique, F.R.S-FNRS) | ||||
| Grant number: | FRFC 2.5.594.09.F |
Data sourced from Thomson Reuters' Web of Knowledge
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