Thermal emission of WASP-48b in the K-s-band

Hellier

Abstract

We report a detection of thermal emission from the hot Jupiter WASP-48b in the Ks-band. We used the Wide-field Infra-red Camera on the 3.6-m Canada-France Hawaii Telescope to observe an occultation of the planet by its host star. From the resulting occultation lightcurve we find a planet-to-star contrast ratio in the Ks-band of 0.136 ± 0.014%, in agreement with the value of 0.109 ± 0.027% previously determined. We fit the two Ks-band occultation lightcurves simultaneously with occultation lightcurves in the H-band and the Spitzer 3.6- and 4.5-µm bandpasses, radial velocity data, and transit lightcurves. From this, we revise the system parameters and construct the spectral energy distribution (SED) of the dayside atmosphere. By comparing the SED with atmospheric models, we find that both models with and without a thermal inversion are consistent with the data. We find the planet’s orbit to be consistent with circular (e < 0.072 at 3s).

Citation

Hellier. (2018). Thermal emission of WASP-48b in the K-s-band. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201527071

• Acceptance Date: Mar 22, 2018
• Publication Date: Jul 18, 2018
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Publisher: EDP Sciences
• DOI: https://doi.org/10.1051/0004-6361/201527071
• Keywords: methods, data analysis, techniques, photometric, planets and satellites, WASP-48b –; stars, individual, WASP-48, planets and satellites, atmospheres
• Publisher URL: http://doi.org/10.1051/0004-6361/201527071