Revisiting the Transit Timing and Atmosphere Characterization of the Neptune-mass Planet HAT-P-26 b

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Napaporn A-thano Supachai Awiphan Ing-Guey Jiang Eamonn Kerins Akshay Priyadarshi Iain McDonald Yogesh C. Joshi Thansuda Chulikorn Joshua J. C. Hayes Stephen Charles Chung-Kai Huang Ronnakrit Rattanamala Li-Chin Yeh Vik S Dhillon

摘要： We present the transit timing variation (TTV) and planetary atmosphere analysis of the Neptune-mass planet HAT-P-26 b. We present a new set of 13 transit light curves from optical ground-based observations and combine them with light curves from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST), Transiting Exoplanet Survey Satellite (TESS), and previously published ground-based data. We refine the planetary parameters of HAT-P-26 b and undertake a TTV analysis using 33 transits obtained over seven years. The TTV analysis shows an amplitude signal of 1.28 minutes, which could result from the presence of an additional 0.02 Jupiter-mass planet at the 1:2 mean-motion resonance orbit. Using a combination of transit depths spanning optical to near-infrared wavelengths, we find that the atmosphere of HAT-P-26 b contains $12^{+2}_{-2}$ % of H$_2$O and $0.1^{+0.1}_{-0.1}$ % of TiO with a derived temperature of $590^{+20}_{-30}$ K.

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