WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars

被引：34

作者：

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

Cameron, A. Collier ^{[2
]}

Hellier, C. ^{[1
]}

Lendl, M. ^{[3
]}

Lister, T. A. ^{[4
]}

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

Queloz, D. ^{[3
,5
]}

Smalley, B. ^{[1
]}

Smith, A. M. S. ^{[1
,6
,7
]}

Triaud, A. H. M. J. ^{[3
,8
]}

Brown, D. J. A. ^{[9
,10
]}

Gillon, M. ^{[11
]}

Neveu-VanMalle, M. ^{[3
]}

Pepe, F. ^{[3
]}

Pollacco, D.

Segransan, D. ^{[3
]}

Udry, S. ^{[3
]}

West, R. G.

Wheatley, P. J.

机构：

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

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

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

[4] Las Cumbres Observ Global Telescope Network, Goleta, CA 93117 USA

[5] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[6] Polish Acad Sci, N Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[7] MIT, Dept Phys, Cambridge, MA 02139 USA

[8] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

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

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

[11] Univ Liege, Inst Astrophys & Geophys, Liege 1, Belgium

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 575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; stars: individual: WASP-20b; stars: individual: WASP-28b; STELLAR ATMOSPHERE MODELS; LIMB-DARKENING LAW; TIDAL EVOLUTION; PLANET; MISALIGNMENT; ALIGNMENT; ROTATION; VELOCITY; SYSTEMS; PARAMETERS;

D O I：

10.1051/0004-6361/201423591

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31 M-Jup; 1.46 R-Jup) in a 4.9-day, near-aligned (lambda = 12.7 +/- 4.2.) orbit around CD-24 102 (V = 10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91 M-Jup; 1.21 R-Jup) in a 3.4-day, near-aligned (lambda = 8 +/- 18 degrees) orbit around a V = 12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7(-1)(+2) Gyr and 6000 +/- 100 K for WASP-20; 5(-2)(+3) Gyr and 6100 +/- 150 K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars' spins via tidal dissipation.

引用

页数：8

共 59 条

[1] The spin axes orbital alignment of both stars within the eclipsing binary system V1143 Cyg using the Rossiter-McLaughlin effect [J].

Albrecht, S. ;

Reffert, S. ;

Snellen, I. ;

Quirrenbach, A. ;

Mitchell, D. S. .

ASTRONOMY & ASTROPHYSICS, 2007, 474 (02) :565-U118

[2] OBLIQUITIES OF HOT JUPITER HOST STARS: EVIDENCE FOR TIDAL INTERACTIONS AND PRIMORDIAL MISALIGNMENTS [J].

Albrecht, Simon ;

Winn, Joshua N. ;

Johnson, John A. ;

Howard, Andrew W. ;

Marcy, Geoffrey W. ;

Butler, R. Paul ;

Arriagada, Pamela ;

Crane, Jeffrey D. ;

Shectman, Stephen A. ;

Thompson, Ian B. ;

Hirano, Teruyuki ;

Bakos, Gaspar ;

Hartman, Joel D. .

ASTROPHYSICAL JOURNAL, 2012, 757 (01)

[3] TWO UPPER LIMITS ON THE ROSSITER-MCLAUGHLIN EFFECT, WITH DIFFERING IMPLICATIONS: WASP-1 HAS A HIGH OBLIQUITY AND WASP-2 IS INDETERMINATE [J].

Albrecht, Simon ;

Winn, Joshua N. ;

Johnson, John Asher ;

Butler, R. Paul ;

Crane, Jeffrey D. ;

Shectman, Stephen A. ;

Thompson, Ian B. ;

Narita, Norio ;

Sato, Bun'ei ;

Hirano, Teruyuki ;

Enya, Keigo ;

Fischer, Debra .

ASTROPHYSICAL JOURNAL, 2011, 738 (01)

[4] WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets [J].

Anderson, D. R. ;

Cameron, A. Collier ;

Gillon, M. ;

Hellier, C. ;

Jehin, E. ;

Lendl, M. ;

Maxted, P. F. L. ;

Queloz, D. ;

Smalley, B. ;

Smith, A. M. S. ;

Triaud, A. H. M. J. ;

West, R. G. ;

Pepe, F. ;

Pollacco, D. ;

Segransan, D. ;

Todd, I. ;

Udry, S. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 422 (03) :1988-1998

[5] Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26 [J].

Anderson, D. R. ;

Cameron, A. Collier ;

Gillon, M. ;

Hellier, C. ;

Jehin, E. ;

Lendl, M. ;

Queloz, D. ;

Smalley, B. ;

Triaud, A. H. M. J. ;

Vanhuysse, M. .

ASTRONOMY & ASTROPHYSICS, 2011, 534

[6] WASP-30b: A 61 MJup BROWN DWARF TRANSITING A V=12, F8 STAR [J].

Anderson, D. R. ;

Cameron, A. Collier ;

Hellier, C. ;

Lendl, M. ;

Maxted, P. F. L. ;

Pollacco, D. ;

Queloz, D. ;

Smalley, B. ;

Smith, A. M. S. ;

Todd, I. ;

Triaud, A. H. M. J. ;

West, R. G. ;

Barros, S. C. C. ;

Enoch, B. ;

Gillon, M. ;

Lister, T. A. ;

Pepe, F. ;

Segransan, D. ;

Street, R. A. ;

Udry, S. .

ASTROPHYSICAL JOURNAL LETTERS, 2011, 726 (02)

[7]

[Anonymous], 2004, BAAS

[8] Wide-field millimagnitude photometry with the HAT:: A tool for extrasolar planet detection [J].

Bakos, G ;

Noyes, RW ;

Kovács, G ;

Stanek, KZ ;

Sasselov, DD ;

Domsa, I .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2004, 116 (817) :266-277

[9] ELODIE: A spectrograph for accurate radial velocity measurements [J].

Baranne, A ;

Queloz, D ;

Mayor, M ;

Adrianzyk, G ;

Knispel, G ;

Kohler, D ;

Lacroix, D ;

Meunier, JP ;

Rimbaud, G ;

Vin, A .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 119 (02) :373-390

[10] On the tidal evolution of Hot Jupiters on inclined orbits [J].

Barker, Adrian J. ;

Ogilvie, Gordon I. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 395 (04) :2268-2287

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