WASP-121 b: a hot Jupiter close to tidal disruption transiting an active F star

被引：132
|
作者：
Delrez, L. [1 ]
Santerne, A. [2 ]
Almenara, J. -M. [3 ,4 ]
Anderson, D. R. [5 ]
Collier-Cameron, A. [6 ]
Diaz, R. F. [7 ]
Gillon, M. [1 ]
Hellier, C. [5 ]
Jehin, E. [1 ]
Lendl, M. [7 ,8 ]
Maxted, P. F. L. [5 ]
Neveu-VanMalle, M. [7 ,9 ]
Pepe, F. [7 ]
Pollacco, D. [10 ]
Queloz, D. [7 ,9 ]
Segransan, D. [7 ]
Smalley, B. [5 ]
Smith, A. M. S. [5 ,11 ]
Triaud, A. H. M. J. [7 ,12 ,13 ]
Udry, S. [7 ]
Van Grootel, V. [1 ]
West, R. G. [10 ]
机构：
[1] Univ Liege, Inst Astrophys & Geophys, Allee 6 Aout 17, B-4000 Liege, Belgium
[2] Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal
[3] Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France
[4] CNRS, IPAG, F-38000 Grenoble, France
[5] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England
[6] Univ St Andrews, Sch Phys & Astron, SUPA, North Haugh KY16 9SS, Fife, Scotland
[7] Univ Geneva, Observ Geneva, 51 Chemin Maillettes, CH-1290 Sauverny, Switzerland
[8] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria
[9] Univ Cambridge, Dept Phys, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England
[10] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[11] Polish Acad Sci, N Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland
[12] Univ Toronto, Ctr Planetary Sci, 1265 Mil Trail, Toronto, ON M1C 1A4, Canada
[13] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 458卷 / 04期
基金：
欧洲研究理事会; 瑞士国家科学基金会; 英国科学技术设施理事会;
关键词：
techniques: photometric; techniques: radial velocities; techniques: spectroscopic; stars: individual: WASP-121; planetary systems; EXTRA-SOLAR PLANETS; THERMAL EMISSION; LIGHT CURVES; CORALIE SURVEY; GIANT PLANETS; MAGNETIC ACTIVITY; BLEND SCENARIOS; HOST STARS; IN PLANETS; K DWARF;
D O I：
10.1093/mnras/stw522
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the discovery by the WASP-South survey of WASP-121 b, a new remarkable short-period transiting hot Jupiter. The planet has a mass of 1.183(-0.062)(+0.064) M-Jup, a radius of 1.865 +/- 0.044 R-Jup, and transits every 1.2749255(-0.000 0025)(+0.000 0020) days an active F6-type main-sequence star (V = 10.4, 1.353(-0.079)(+0.080) M-circle dot, 1.458 +/- 0.030 R-circle dot, T-eff = 6460 +/- 140 K). A notable property of WASP-121 b is that its orbital semimajor axis is only similar to 1.15 times larger than its Roche limit, which suggests that the planet is close to tidal disruption. Furthermore, its large size and extreme irradiation (similar to 7.1 10(9) erg s(-1) cm(-2)) make it an excellent target for atmospheric studies via secondary eclipse observations. Using the TRAnsiting Planets and PlanetesImals Small Telescope, we indeed detect its emission in the z'-band at better than similar to 4 sigma, the measured occultation depth being 603 +/- 130 ppm. Finally, from a measurement of the Rossiter-McLaughlin effect with the CORALIE spectrograph, we infer a sky-projected spin-orbit angle of 257 degrees.8(-5 degrees.5)(+5 degrees.3). This result may suggest a significant misalignment between the spin axis of the host star and the orbital plane of the planet. If confirmed, this high misalignment would favour a migration of the planet involving strong dynamical events with a third body.
引用
收藏
页码：4025 / 4043
页数：19
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