期刊
ASTRONOMY & ASTROPHYSICS
卷 513, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201014226
关键词
planets and satellites: atmospheres; planetary systems; stars: individual: WASP-19b; techniques: photometric
资金
- Belgian Science Policy Office
- Science and Technology Facilities Council [ST/G002355/1, PP/D000955/1, PP/F000057/1, PP/F000065/1] Funding Source: researchfish
- STFC [ST/G002355/1, PP/D000955/1, PP/F000065/1, PP/F000057/1] Funding Source: UKRI
We present the first ground-based detection of thermal emission from an exoplanet in the H-band. Using HAWK-I on the VLT, we observed an occultation of WASP-19b by its G8V-type host star. WASP-19b is a Jupiter-mass planet with an orbital period of only 19 h, and thus, being highly irradiated, is expected to be hot. We measure an H-band occultation depth of 0.259(-0.044)(+0.046)%, which corresponds to an H-band brightness temperature of T-H = 2580 +/- 125 K. A cloud-free model of the planet's atmosphere, with no redistribution of energy from day-side to night-side, under predicts the planet/star flux density ratio by a factor of two. As the stellar parameters, and thus the level of planetary irradiation, are well-constrained by measurement, it is likely that our model of the planet's atmosphere is too simple.
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