An enhanced slope in the transmission spectrum of the hot Jupiter WASP-104b
An enhanced slope in the transmission spectrum of the hot Jupiter WASP-104b
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DOI：
10.1093/mnras/staa3555
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发表时间：
2020-11
影响因子：
4.8
通讯作者：
G. Chen;E. Pallé;E. Pallé;H. Parviainen;H. Parviainen;Hong-shuai Wang;R. Boekel;F. Murgas;F. M
中科院分区：
文献类型：
--
作者：
G. Chen;E. Pallé;E. Pallé;H. Parviainen;H. Parviainen;Hong-shuai Wang;R. Boekel;F. Murgas;F. M
我们根据帕洛玛200英寸望远镜上DBSP光谱仪的蓝色和红色通道观测到的一次凌日和卡洛斯·桑切斯望远镜上MuSCAT2四通道成像仪观测到的14次凌日，给出了热木星WASP-104b的透射光谱。在校正了伴星的通量污染后，我们还分析了45个额外的K2凌日。结合DBSP和MuSCAT2获得的凌日光曲线，我们能够修正系统参数和轨道星历，确认不存在凌日时间变化。我们的DBSP和MuSCAT2组合透射光谱显示，在波长短于630 nm时斜率增强，并且表明在波长较长时存在云层。虽然贝叶斯光谱检索分析倾向于朦胧的大气，但不能完全排除恒星斑点污染的可能性。需要进一步的证据，从透射光谱和主恒星活动的详细特征，来区分增强斜率的物理来源。
We present the optical transmission spectrum of the hot Jupiter WASP-104b based on one transit observed by the blue and red channels of the DBSP spectrograph at the Palomar 200-inch telescope and 14 transits observed by the MuSCAT2 four-channel imager at the 1.52 m Telescopio Carlos Sanchez. We also analyse 45 additional K2 transits, after correcting for the flux contamination from a companion star. Together with the transit light curves acquired by DBSP and MuSCAT2, we are able to revise the system parameters and orbital ephemeris, confirming that no transit timing variations exist. Our DBSP and MuSCAT2 combined transmission spectrum reveals an enhanced slope at wavelengths shorter than 630 nm and suggests the presence of a cloud deck at longer wavelengths. While the Bayesian spectral retrieval analyses favour a hazy atmosphere, stellar spot contamination cannot be completely ruled out. Further evidence, from transmission spectroscopy and detailed characterisation of the host star's activity, is required to distinguish the physical origin of the enhanced slope.