2011A&A...533A..88G


Query : 2011A&A...533A..88G

2011A&A...533A..88G - Astronomy and Astrophysics, volume 533A, 88-88 (2011/9-1)

WASP-50b: a hot Jupiter transiting a moderately active solar-type star.

GILLON M., DOYLE A.P., LENDL M., MAXTED P.F.L., TRIAUD A.H.M.J., ANDERSON D.R., BARROS S.C.C., BENTO J., COLLIER-CAMERON A., ENOCH B., FAEDI F., HELLIER C., JEHIN E., MAGAIN P., MONTALBAN J., PEPE F., POLLACCO D., QUELOZ D., SMALLEY B., SEGRANSAN D., SMITH A.M.S., SOUTHWORTH J., UDRY S., WEST R.G. and WHEATLEY P.J.

Abstract (from CDS):

We report the discovery by the WASP transit survey of a giant planet in a close orbit (0.0295±0.0009AU) around a moderately bright (V=11.6, K=10) G9 dwarf (0.89±0.08M, 0.84±0.03R) 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-50b, are well constrained to 1.47±0.09MJup and 1.15±0.05RJup, respectively. The transit ephemeris is 2455558.6120 (±0.0002)+Nx1.955096(±0.000005)HJDUTC. The size of the planet is consistent with basic models of irradiated giant planets. The chromospheric activity (logR'HK=-4.67) and rotational period (Prot=16.3±0.5-days) of the host star suggest an age of 0.8±0.4Gy that is discrepant with a stellar-evolution estimate based on the measured stellar parameters (ρ*=1.48±0.10 ρ, Teff=5400±100K, [Fe/H]=-0.12±0.08) which favors an age of 7±3.5Gy. 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+6deg, disfavoring a high stellar obliquity. Thanks to its large irradiation and the relatively small size of its host star, WASP-50b 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.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - planetary systems - techniques: radial velocities - stars: individual: WASP-50 - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/533/A88): euler.dat trappist.dat wasp.dat rv.dat>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 WASP-50b Pl 02 54 45.1341750384 -10 53 53.025224640           ~ 38 1
2 WASP-50 EB* 02 54 45.1341750384 -10 53 53.025224640   12.43 11.44 11.599   G9V 49 1
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
4 WASP-12b Pl 06 30 32.7966092352 +29 40 20.263502460           ~ 763 1
5 CoRoT-13 EB* 06 50 53.0726565720 -05 05 11.190799896   15.33 15.039 15.17 14.19 G0V 33 1
6 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1564 0
7 CD-29 9873b Pl 12 42 28.4949559632 -30 38 23.529045948           ~ 41 1
8 CD-29 9873 * 12 42 28.4949559632 -30 38 23.529045948   12.36 11.63 11.39 10.78 G8V 64 1

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