Reference : WASP-23b: a transiting hot Jupiter around a K dwarf and its Rossiter-McLaughlin effect
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/95415
WASP-23b: a transiting hot Jupiter around a K dwarf and its Rossiter-McLaughlin effect
English
Triaud, A H M J [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Queloz, D. [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Hellier, C. [Astrophysics Group, Keele University, Staffordshire, ST55BG, UK]
Gillon, Michaël mailto [Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bât. B5C, Liège 1, Belgium]
Smalley, B. [Astrophysics Group, Keele University, Staffordshire, ST55BG, UK]
Hebb, L. [Department of Physics and Astronomy, Vanderbilt University, Nashville, TN37235, USA]
Collier Cameron, A. [SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, KY16 9SS, St Andrews, Fife, Scotland, UK]
Anderson, D. [Astrophysics Group, Keele University, Staffordshire, ST55BG, UK]
Boisse, I. [Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal; Institut d'Astrophysique de Paris, CNRS (UMR 7095), Université Pierre & Marie Curie, 98bis bd. Arago, 75014, Paris, France]
Hébrard, G. [Institut d'Astrophysique de Paris, CNRS (UMR 7095), Université Pierre & Marie Curie, 98bis bd. Arago, 75014, Paris, France; Observatoire de Haute-Provence, CNRS/OAMP, 04870 St Michel l', Observatoire, France]
Jehin, Emmanuel [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
Lister, T. [Las Cumbres Observatory, 6740 Cortona Dr. Suite 102, Santa Barbara, CA, 93117, USA]
Lovis, C. [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Maxted, P. F. L. [Astrophysics Group, Keele University, Staffordshire, ST55BG, UK]
Pepe, F. [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Pollacco, D. [Astrophysics Research Centre, School of Mathematics & Physics, Queens University, University Road, Belfast, BT71, NN, UK]
Ségransan, D. [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Simpson, E. [Astrophysics Research Centre, School of Mathematics & Physics, Queens University, University Road, Belfast, BT71, NN, UK]
Udry, S. [Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
West, R. [Department of Physics and Astronomy, Universityof Leicester, Leicester, LE17, RH, UK]
1-Jul-2011
Astronomy and Astrophysics
EDP Sciences
531
24
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] binaries: eclipsing ; planetary systems ; stars: individual: WASP-23 ; techniques: spectroscopic ; techniques: photometric ; stars: rotation
[en] We report the discovery of a new transiting planet in the southern hemisphere. It was found by the WASP-south transit survey and confirmed photometrically and spectroscopically by the 1.2 m Swiss Euler telescope, LCOGT 2m Faulkes South Telescope, the 60 cm TRAPPIST telescope, and the ESO 3.6 m telescope. The orbital period of the planet is 2.94 days. We find that it is a gas giant with a mass of 0.88 ± 0.10 M[SUB]J[/SUB] and an estimated radius of 0.96 ± 0.05 R[SUB]J[/SUB]. We obtained spectra during transit with the HARPS spectrograph and detect the Rossiter-McLaughlin effect despite its small amplitude. Because of the low signal-to-noise ratio of the effect and a small impact parameter, we cannot place a strong constraint on the projected spin-orbit angle. We find two conflicting values for the stellar rotation. We find, via spectral line broadening, that v sin I = 2.2 ± 0.3 km s[SUP]-1[/SUP], while applying another method, based on the activity level using the index log R'_HK, gives an equatorial rotation velocity of only v = 1.35 ± 0.20 km s[SUP]-1[/SUP]. Using these as priors in our analysis, the planet might be either misaligned or aligned. This result raises doubts about the use of such priors. There is evidence of neither eccentricity nor any radial velocity drift with time. Using WASP-South photometric observations confirmed with LCOGT Faulkes South Telescope, the 60 cm TRAPPIST telescope, the CORALIE spectrograph and the camera from the Swiss 1.2 m Euler Telescope placed at La Silla, Chile, as well as with the HARPS spectrograph, mounted on the ESO 3.6 m, also at La Silla, under proposal 084.C-0185. The data is publicly available at the CDS Strasbourg and on demand to the main author.RV data is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A24">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A24</A>Appendix is available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>
http://hdl.handle.net/2268/95415
10.1051/0004-6361/201016367
http://adsabs.harvard.edu/abs/2011A%26A...531A..24T
http://de.arxiv.org/abs/1103.2603

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
1103.2603v1.pdfAuthor preprint2.17 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.