Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 2G012

Ground-based detections of thermal emission from the dense hot Jupiter WASP-43b in H and Ks

Wang, Wei (National Astronomical Observatories, Chinese Academy of Sicences)
van Boekel, Roy (Max-Planck Institute for Astronomy)
Madhusudhan, Nikku (Yale University)
Chen, Guo (Purple Mountain Observatory)
Zhao, Gang (National Astronomical Observatories, Chinese Academy of Sicences)
Henning, Thomas (Max-Planck Institute for Astronomy)

We report new detections of thermal emission from the transiting hot Jupiter WASP-43b in the H and Ks-bands as observed at secondary eclipses. The observations were made with the WIRCam instrument on the CFHT. We obtained a secondary eclipse depth of 0.103+-0.017% and 0.194+-0.029% in the H and Ks-bands, respectively. The Ks band depth is consistent with previous measurement in the narrow band centered at 2.09 um (Gillon et al. 2012). Our eclipse depths in both bands are consistent with a blackbody spectrum with a temperature of ~1850 K, slightly higher than the dayside equilibrium temperature without day-night energy redistribution. Based on theoretical models of the dayside atmosphere of WASP-43b, our data constrain the day-night energy redistribution in the planet to be <=15-25%, depending on the metal content in the atmosphere. A strong thermal inversion in the dayside atmosphere is ruled out by our current data. Future observations are required to place detailed constraints on the chemical composition of the atmosphere.

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