Exoplanets & Exomoons

Ephemeris Updates For Seven Selected HATNet Survey Transiting Exoplanets

By Keith Cowing
Status Report
June 2, 2023
Filed under , , , , , , , , , , ,
Ephemeris Updates For Seven Selected HATNet Survey Transiting Exoplanets
Left: HAT-P-33b observational and theoretical light curves using TESS sector 45 data; Right: The observational light curve of HAT-P-32b from this study in the 𝑉 filter and the theoretical light curve. — astro-ph.EP

We refined the ephemeris of seven transiting exoplanets HAT-P-6b, HAT-P-12b, HAT-P-18b, HAT-P-22b, HAT-P-32b, HAT-P-33b, and HAT-P-52b. We observed 11 transits from eight observatories in different filters for HAT-P-6b and HAT-P-32b.

Also, the Exoplanet Transit Database (ETD) observations for each of the seven exoplanets were analyzed, and the light curves of five systems were studied using Transiting light Exoplanet Survey Satellite (TESS) data. We used Exofast-v1 to simulate these ground- and space-based light curves and estimate mid-transit times.

We obtained a total of 11, 175 and 67 mid-transit times for these seven exoplanets from our observations, ETD and TESS data, respectively, along with 155 mid-transit times from the literature. Then, we generated transit timing variation (TTV) diagrams for each using derived mid-transit times as well as those found in the literature.

The systems’ linear ephemeris was then refined and improved using the Markov Chain Monte Carlo (MCMC) method. All of the studied exoplanets, with the exception of the HAT-P-12b system, displayed an increasing trend in the orbital period in the TTV diagrams.

A. Poro, F. Ahangarani Farahani, E. Jahangiri, A. Sarostad, M. Gozarandi, M. Haghgou, F. Abolhassani, A. Fakhrabadi, Y. Jongen, A. Wünsche, R. Naves, P. Guerra, A. Marchini, M. Salisbury, R. Ehrenberger, V-P. Hentunen

Comments: 11 Pages, submitted to the Astrophysics journal
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2306.00022 [astro-ph.EP] (or arXiv:2306.00022v1 [astro-ph.EP] for this version)
Submission history
From: Atila Poro
[v1] Tue, 30 May 2023 20:21:02 UTC (1,202 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻