J/A+A/501/785 Discovery and characterization of WASP-6b (Gillon+, 2009)
Discovery and characterization of WASP-6b, an inflated sub-Jupiter mass planet
transiting a solar-type star.
Gillon M., Anderson D.R., Triaud A.H.M.J., Hellier C., Maxted P.F.L.,
Pollaco D., Queloz D., Smalley B., West R.G., Wilson D.M., Bentley S.J.,
Collier Cameron A., Enoch B., Hebb L., Horne K., Irwin J., Joshi Y.C.,
Lister T.A., Mayor M., Pepe F., Parley N., Segransan D., Udry S.,
Wheatley P.J.
<Astron. Astrophys. 501, 785 (2009)>
=2009A&A...501..785G 2009A&A...501..785G
ADC_Keywords: Binaries, eclipsing ; Planets ; Radial velocities ; Photometry
Keywords: binaries: eclipsing - stars: individual: WASP-6 - planetary systems -
techniques: photometric - techniques: radial velocities -
techniques: spectroscopic
Abstract:
We report the discovery of WASP-6b, an inflated sub-Jupiter mass
planet transiting every 3.3610060+0.0000022-0.0000035days a mildly
metal-poor solar-type star of magnitude V=11.9. A combined analysis of
the WASP photometry, high-precision followup transit photometry and
radial velocities yield a planetary mass Mp=0.503+0.019-0.038
and radius Rp=1.224+0.0510.052, resulting in a density
ρp=0.27±0.05ρJ. The mass and radius for the host star
are M*=0.88+0.05-0.08M☉_ and
R*=0.8700.025-0.036R☉. The non-zero orbital eccentricity
e=0.054+0.018-0.015 that we measure suggests that the planet
underwent a massive tidal heating ∼1Gyr ago that could have
contributed to its inflated radius. High-precision radial velocities
obtained during a transit allow us to measure a sky-projected angle
between the stellar spin and orbital axis β=11+14-18°. In
addition to similar published measurements, this result favors a
dominant migration mechanism based on tidal interactions with a
protoplanetary disk.
Description:
The host star WASP-6 was observed by WASP-South during the 2006 and
2007 observing seasons. Spectroscopic measurements were obtained using
the CORALIE spectrograph mounted on the Euler Swiss telescope (La
Silla, Chile) to confirm the planetary nature of the eclipsing body
and measure its mass. WASP-6 was observed from 2007 September 16 to
2007 October 26 and from 2008 September 11 to 2008 September 25. 44
additional spectroscopic measurements were obtained with the HARPS
spectrograph based on the 3.6-m ESO telescope (La Silla, Chile).
Objects:
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RA (2000) DE Designation(s)
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23 12 37.74 -22 40 26.2 WASP-6 = WASP 6
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rise1.dat 40 4167 WASP-6 deredenned and normalized differential
photometry obtained by LT_RISE on 2008 July 25
rise2.dat 40 2857 WASP-6 deredenned and normalized differential
photometry obtained by LT_RISE on 2008 August 11
swasp.dat 40 9630 WASP-6 deredenned and normalized differential
photometry obtained by the SuperWASP survey
fts.dat 40 230 WASP-6 deredenned and normalized differential
photometry obtained by FTS_HawkCam2 on
2007 October 13
coralie.dat 43 35 WASP-6 radial velocities obtained by the
spectrograph CORALIE
harps.dat 43 44 WASP-6 radial velocities obtained by the
spectrograph HARPS
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Byte-by-byte Description of file: rise1.dat rise2.dat swasp.dat fts.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d BJD Barycentric Julian date
18- 25 F8.6 --- Flux Flux (relative)
33- 40 F8.6 --- e_Flux ?=9 rms uncertainty on Flux
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Byte-by-byte Description of file: coralie.dat harps.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date
17- 24 F8.5 km/s RV Radial velocity
27- 33 F7.5 km/s e_RV rms uncertainty on RV
36- 43 F8.5 km/s Bisec Velocity from bisector technique
(Queloz et al. 2001A&A...379..279Q 2001A&A...379..279Q)
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Acknowledgements:
Michael Gillon, Michael.Gillon (at)obs.unige.ch
(End) Patricia Vannier [CDS] 11-May-2009