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

A-thano, Napaporn; Awiphan, Supachai; Jiang, Ing-Guey; Kerins, Eamonn; Priyadarshi, Akshay; McDonald, Iain; Joshi, Yogesh C.; Chulikorn, Thansuda; Hayes, Joshua J. C.; Charles, Stephen; Huang, Chung-Kai; Rattanamala, Ronnakrit; Yeh, Li-Chin and Dhillon, Vik S (2023). Revisiting the Transit Timing and Atmosphere Characterization of the Neptune-mass Planet HAT-P-26 b. The Astronomical Journal, 166(6), article no. 223.

DOI: https://doi.org/10.3847/1538-3881/acfeea

Abstract

We present a 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 on the Hubble Space Telescope, the Transiting Exoplanet Survey Satellite, 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 1.98 ± 0.05 minutes, which could result from the presence of an additional ∼0.02 planet at a 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 2.4% with a derived temperature of 590K.

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