Thermal emission at 3.6-8 μm from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star

被引：40

作者：

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

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

Madhusudhan, N. ^{[2
]}

Wheatley, P. J. ^{[3
]}

Cameron, A. Collier ^{[4
]}

Hellier, C. ^{[1
]}

Campo, C. ^{[5
]}

Gillon, M. ^{[6
]}

Harrington, J. ^{[5
]}

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

Pollacco, D. ^{[7
]}

Queloz, D. ^{[8
]}

Smalley, B. ^{[1
]}

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

West, R. G. ^{[9
]}

机构：

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

[2] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

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

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

[5] Univ Cent Florida, Dept Phys, Planetary Sci Grp, Orlando, FL 32816 USA

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

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

[8] Univ Geneva, Observ Geneve, CH-1290 Sauverny, Switzerland

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 430卷 / 04期

关键词：

methods: data analysis; techniques: photometric; occultations; planets and satellites: atmospheres; planets and satellites: individual: WASP-19b; stars: individual: WASP-19; COLLISION-INDUCED ABSORPTION; SPITZER-SPACE-TELESCOPE; EXOPLANET HD 189733B; GIANT PLANETS; EXTRASOLAR PLANET; TRANSITING EXOPLANET; SECONDARY ECLIPSE; STELLAR ACTIVITY; ATMOSPHERES; INVERSIONS;

D O I：

10.1093/mnras/stt140

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 mu m. We used the InfraRed Array Camera on the Spitzer Space Telescope to observe two occultations of WASP-19b by its host star. We combine our new detections with previous measurements of WASP-19b's emission at 1.6 and 2.09 mu m to construct a spectral energy distribution of the planet's dayside atmosphere. By comparing this with model-atmosphere spectra, we find that the dayside atmosphere of WASP-19b lacks a strong temperature inversion. As WASP-19 is an active star (log R'(HK) = -4.50 +/- 0.03), this finding supports the hypothesis of Knutson, Howard and Isaacson that inversions are suppressed in hot Jupiters orbiting active stars. The available data are unable to differentiate between a carbon-rich and an oxygen-rich atmosphere.

引用

页码：3422 / 3431

页数：10

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