WASP-21b: a hot-Saturn exoplanet transiting a thick disc star

被引：44

作者：

Bouchy, F. ^{[1
,2
]}

Hebb, L. ^{[3
,5
]}

Skillen, I. ^{[4
]}

Cameron, A. Collier ^{[5
]}

Smalley, B. ^{[6
]}

Udry, S. ^{[7
]}

Anderson, D. R. ^{[6
]}

Boisse, I. ^{[1
]}

Enoch, B. ^{[5
]}

Haswell, C. A. ^{[8
]}

Hebrard, G. ^{[1
]}

Hellier, C. ^{[6
]}

Joshi, Y. ^{[9
]}

Kane, S. R. ^{[10
]}

Maxted, P. F. L. ^{[6
]}

Mayor, M. ^{[7
]}

Moutou, C. ^{[11
]}

Pepe, F. ^{[7
]}

Pollacco, D. ^{[9
]}

Queloz, D. ^{[7
]}

Segransan, D. ^{[7
]}

Simpson, E. K. ^{[9
]}

Smith, A. M. S. ^{[6
]}

Stempels, H. C. ^{[12
]}

Street, R. ^{[13
]}

Triaud, A. H. M. J. ^{[7
]}

West, R. G. ^{[14
]}

Wheatley, P. J. ^{[15
]}

机构：

[1] Univ Paris 06, CNRS, UMR7095, Inst Astrophys Paris, F-75014 Paris, France

[2] Observ Haute Provence, CNRS OAMP, F-04870 St Michel lObservatoire, France

[3] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[4] Isaac Newton Grp Telescopes, Tenerife 38700, Spain

[5] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[6] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[7] Univ Geneva, Observ Geneva, CH-1290 Sauverny, Switzerland

[8] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England

[9] Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland

[10] CALTECH, NASA Exoplanet Sci Inst, Pasadena, CA 91125 USA

[11] Astrophys Lab, F-13388 Marseille 13, France

[12] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[13] Las Cumbres Observ, Goleta, CA 93117 USA

[14] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[15] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 519卷

基金：

瑞士国家科学基金会; 英国科学技术设施理事会;

关键词：

planetary systems; techniques: photometric; techniques: radial velocities; CORALIE SURVEY; PLANET; METALLICITY; EVOLUTION;

D O I：

10.1051/0004-6361/201014817

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of WASP-21b, a new transiting exoplanet discovered by the Wide Angle Search for Planets ( WASP) Consortium and established and characterized with the FIES, SOPHIE, CORALIE and HARPS fiber-fed echelle spectrographs. A 4.3-d period, 1.1% transit depth and 3.4-h duration are derived for WASP-21b using SuperWASP-North and high precision photometric observations at the Liverpool Telescope. Simultaneous fitting to the photometric and radial velocity data with a Markov Chain Monte Carlo procedure leads to a planet in the mass regime of Saturn. With a radius of 1.07 R-Jup and mass of 0.30 M-Jup, WASP-21b has a density close to 0.24 rho(Jup) corresponding to the distribution peak at low density of transiting gaseous giant planets. With a host star metallicity [Fe/H] of -0.46, WASP-21b strengthens the correlation between planetary density and host star metallicity for the five known Saturn-like transiting planets. Furthermore there are clear indications that WASP-21b is the first transiting planet belonging to the thick disc.

引用

页数：6

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