WASP-17b: AN ULTRA-LOW DENSITY PLANET IN A PROBABLE RETROGRADE ORBIT

被引：160

作者：

Anderson, D. R. ^{[1
]}

Hellier, C. ^{[1
]}

Gillon, M. ^{[2
,3
]}

Triaud, A. H. M. J. ^{[2
]}

Smalley, B. ^{[1
]}

Hebb, L. ^{[4
]}

Cameron, A. Collier ^{[4
]}

Maxted, P. F. L. ^{[1
]}

Queloz, D. ^{[2
]}

West, R. G. ^{[5
]}

Bentley, S. J. ^{[1
]}

Enoch, B. ^{[4
]}

Horne, K. ^{[4
]}

Lister, T. A. ^{[6
]}

Mayor, M. ^{[2
]}

Parley, N. R. ^{[4
]}

Pepe, F. ^{[2
]}

Pollacco, D. ^{[7
]}

Segransan, D. ^{[2
]}

Udry, S. ^{[2
]}

Wilson, D. M. ^{[1
]}

机构：

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

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

[3] Univ Liege, Inst Astrophys & Geophys, B-1 Liege, Belgium

[4] Univ St Andrews, Sch Phys & Astron, Haugh KY16 9SS, Fife, Scotland

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

[6] Las Cumbres Observ, Santa Barbara, CA 93117 USA

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

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 709卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

planetary systems; stars: individual (WASP-17); TRANSITING EXTRASOLAR PLANETS; LIGHT-CURVE PROJECT; SPIN-ORBIT; GIANT PLANETS; IMPROVED PARAMETERS; EXOPLANET HAT-P-1B; TIDAL INFLATION; ECCENTRIC ORBIT; HOT JUPITERS; SYSTEM;

D O I：

10.1088/0004-637X/709/1/159

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of the transiting giant planet WASP-17b, the least-dense planet currently known. It is 1.6 Saturn masses, but 1.5-2 Jupiter radii, giving a density of 6%-14% that of Jupiter. WASP-17b is in a 3.7 day orbit around a sub-solar metallicity, V = 11.6, F6 star. Preliminary detection of the Rossiter-McLaughlin effect suggests that WASP-17b is in a retrograde orbit (lambda approximate to -150 degrees), indicative of a violent history involving planet-planet or star-planet scattering. WASP-17b's bloated radius could be due to tidal heating resulting from recent or ongoing tidal circularization of an eccentric orbit, such as the highly eccentric orbits that typically result from scattering interactions. It will thus be important to determine more precisely the current orbital eccentricity by further high-precision radial velocity measurements or by timing the secondary eclipse, both to reduce the uncertainty on the planet's radius and to test tidal-heating models. Owing to its low surface gravity, WASP-17b's atmosphere has the largest scale height of any known planet, making it a good target for transmission spectroscopy.

引用

页码：159 / 167

页数：9

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