Thermal emission from the hot Jupiter WASP-103 b in J and Ks bands. Issue 1 (28th March 2023)

• Record Type: Journal Article
• Authors: Shi, Yaqing; Wang, Wei; Zhao, Gang; Zhai, Meng; Chen, Guo; Jiang, Zewen; Ouyang, Qinglin; Henning, Thomas; Zhao, Jingkun; Crouzet, Nicolas; van Boekel, Roy; Esteves, Lisa
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 522:Issue 1(2023)
• Page Start: 1491
• Page End: 1503
• Publication Date: 2023-03-28
• Subjects: techniques: photometric -- planets and satellites: atmospheres -- planets and satellites: gaseous planets -- planets and satellites: individual:(WASP-103b); Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stad891
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: Hot Jupiters, particularly those with temperature higher than 2000 K, are the best sample of planets that allow in-depth characterization of their atmospheres. We present here a thermal emission study of the ultrahot Jupiter WASP-103 b observed in two secondary eclipses with CFHT/WIRCam in J and K s bands. By means of high precision differential photometry, we determine eclipse depths in J and K s to an accuracy of 220 and 270 ppm, which are combined with the published HST /WFC3 and Spitzer data to retrieve a joint constraints on the properties of WASP-103 b dayside atmosphere. We find that the atmosphere is best fit with a thermal inversion layer included. The equilibrium chemistry retrieval indicates an enhanced C/O (1.35$^{+0.14}_{-0.17}$ ) and a supermetallicity with [Fe/H]$=2.19^{+0.51}_{-0.63}$ composition. Given the near-solar metallicity of WASP-103 of [Fe/H] = 0.06, this planet seems to be ∼100 more abundant than its host star. The free chemistry retrieval analysis yields a large abundance of FeH, H −, CO2, and CH4 . Additional data of better accuracy from future observations of JWST should provide better constraint of the atmospheric properties of WASP-103b.