CAOSP abstracts, Volume: 49, No.: 3, year: 2019

Author(s): Maimone, M.C.; Tinaut-Ruano, F.; Różański, T.; Parviainen, H.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 49, no. 3, p. 551-555.
Date: 12/2019
Title: Transit modeling of WASP-43b
Keyword(s): Extrasolar planets, photometry, exoplanet transits, Bayesian statistics
Pages: 551 -- 555
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: The goal of this project was to learn how to estimate basic pro-perties of a transiting exoplanet from ground-based transit photometry. We analysed a photometric time series of a single WASP-43b transit. Data reduction was carried out using a custom-built aperture photometry pipeline written in Python, while a custom light-curve modelling code based on PyTransit was used for parameter estimation. We obtained a transit time centre T₀=2 458 168.0862±0.0001, a radius ratio R_p/R_★=0.121±0.004 and an impact parameter b=0.71±0.06. We compared our results with literature and found agreement within 3 σ for almost parameters. The two exceptions were the time of the transit centre, T₀, and the radius ratio, both with significant discrepancy. We believe the T₀ discrepancy is due to the bad accuracy of the period and/or T₀ values, while the radius ratio discrepancy could be due to systematics that were not accounted sufficiently by the linear baseline model used in the transit modelling.