TY - JOUR
T1 - H-band thermal emission from the 19-h period planet WASP-19b
AU - Anderson, D. R.
AU - Gillon, M.
AU - Maxted, P. F.L.
AU - Barman, T. S.
AU - Collier Cameron, A.
AU - Hellier, C.
AU - Queloz, D.
AU - Smalley, B.
AU - Triaud, A. H.M.J.
PY - 2010/4/14
Y1 - 2010/4/14
N2 - 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+0.046 -0.044, which corresponds to an H-band brightness temperature of TH = 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.
AB - 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+0.046 -0.044, which corresponds to an H-band brightness temperature of TH = 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.
KW - Planetary systems
KW - Planets and satellites: atmospheres
KW - Stars: individual: WASP-19b
KW - Techniques: photometric
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U2 - 10.1051/0004-6361/201014226
DO - 10.1051/0004-6361/201014226
M3 - Article
AN - SCOPUS:77952986087
SN - 0004-6361
VL - 513
JO - Astronomy and astrophysics
JF - Astronomy and astrophysics
IS - 2
M1 - L3
ER -