Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) III. Atmospheric structure of the misaligned ultra-hot Jupiter WASP-121b

被引：95

作者：

Bourrier, V. ^{[1
]}

Ehrenreich, D. ^{[1
]}

Lendl, M. ^{[1
]}

Cretignier, M. ^{[1
]}

Allart, R. ^{[1
]}

Dumusque, X. ^{[1
]}

Cegla, H. M. ^{[1
]}

Suarez-Mascareno, A. ^{[2
]}

Wyttenbach, A. ^{[3
]}

Hoeijmakers, H. J. ^{[1
,4
]}

Melo, C. ^{[5
]}

Kuntzer, T. ^{[1
]}

Astudillo-Defru, N. ^{[6
]}

Giles, H. ^{[1
]}

Heng, K. ^{[2
]}

Kitzmann, D. ^{[4
]}

Lavie, B. ^{[1
]}

Lovis, C. ^{[1
]}

Murgas, F. ^{[2
,7
]}

Nascimbeni, V. ^{[8
]}

Pepe, F. ^{[1
]}

Pino, L. ^{[9
]}

Segransan, D. ^{[1
]}

Udry, S. ^{[1
]}

机构：

[1] Observ Univ Geneve, 51 Chemin Maillettes, CH-1290 Versoix, Switzerland

[2] IAC, San Cristobal la Laguna 38205, Tenerife, Spain

[3] Leiden Univ, Leiden Observ, Postbus 9513, NL-2300 RA Leiden, Netherlands

[4] Univ Bern, Ctr Space & Habitabil, Gesell Str 6, CH-3012 Bern, Switzerland

[5] European Southern Observ, Alonso de Cordova 3107, Vitacura, Region Metropol, Chile

[6] Univ Catolica Santisima Concepcion, Dept Matemat & Fis Aplicadas, Alonso de Rivera 2850, Concepcion, Chile

[7] ULL, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain

[8] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[9] Univ Amsterdam, Anton Pannekoek Inst Astron, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 635卷

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

planets and satellites: atmospheres; planets and satellites: fundamental parameters; instrumentation: spectrographs; planets and satellites: individual: WASP-121b; methods: observational; techniques: spectroscopic; SHORT-PERIOD; PLANET; VELOCITY; STAR; ROTATION; DISRUPTION; STELLAR;

D O I：

10.1051/0004-6361/201936640

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres. In this context, we present the analysis of new optical spectroscopy for the transiting ultra-hot Jupiter WASP-121b. We first refine the orbital properties of WASP-121b, which is on a nearly polar (obliquity psi(North) = 88.1 +/- 0.25 degrees or psi(South) = 91.11 +/- 0.20 degrees) orbit, and exclude a high differential rotation for its fast-rotating (P < 1.13 days), highly inclined (i(star)i star North = 8.1(-2.6)(+3.0)degrees-2.6+3.0 degrees or i(star)(South) i star South = 171.9(-3.4)(+2.5)degrees-3.4+2.5 degrees ) star. We then present a new method that exploits the reloaded Rossiter-McLaughlin technique to separate the contribution of the planetary atmosphere and of the spectrum of the stellar surface along the transit chord. Its application to HARPS transit spectroscopy of WASP-121b reveals the absorption signature from metals, likely atomic iron, in the planet atmospheric limb. The width of the signal (14.3 +/- 1.2 km s(-1)) can be explained by the rotation of the tidally locked planet. Its blueshift (-5.2 +/- 0.5 km s(-1)) could trace strong winds from the dayside to the nightside, or the anisotropic expansion of the planetary thermosphere.

引用

页数：16

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