2020/12/31 by Fatemeh Davoudi, PegahSadat MirshafieKhozani, Ehsan Paki +18
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Ephemeris #Exoplanet #Hot Jupiter #Light curve #Orbital decay #Orbital period #Physics #Planet #Planetary system #Satellite #Stars #Stellar, planetary, and galactic studies #Transit (satellite) #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1134/s1063773721090024
14 figures, accepted at the Astronomy Letters journal
arxiv created 2021/08/14 · openalex publication_date 2021/09/01 · arxiv updated 2022/01/05 · openalex created_date 2022/05/12 · openalex updated_date 2026/08/05
WASP-12 b, WASP-33 b, WASP-36 b, and WASP-46 b are four transiting hot Jupiters, which we have studied. These systems’ light curves were derived from observations made by the Transiting Light Exoplanet Survey Satellite (TESS) and some ground-based telescopes. We used Exofast-v1 to model these light curves and calculate mid-transit times. Also, we plotted TTV diagrams for them using derived mid-transit times and those available within the literature. O–C analysis of these timings enables us to refine the linear ephemeris of four systems. We measured WASP-12’s tidal quality factor based on adding TESS data as Q′*=(2.13± 0.29)× 105 . According to the analysis, the orbital period of the WASP-46 b system is increasing. The WASP-36 b and WASP-33 b systems have not shown any obvious quadratic trend in their TTV diagrams. The increase in their period is most likely due to inaccurate liner ephemeris that has increased over time. So, more observations are needed to evaluate whether or not there is an orbital decay in the WASP-36 b and WASP-33 b systems.