文章基本信息

标题：PyTranSpot: A tool for multiband light curve modeling of planetary transits and stellar spots
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作者：Ines G. Juvan ; M. Lendl ; P. E. Cubillos 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：610
DOI：10.1051/0004-6361/201731345
语种：English
出版社：EDP Sciences
摘要：Several studies have shown that stellar activity features, such as occulted and non-occulted starspots, can affect the measurement of transit parameters biasing studies of transit timing variations and transmission spectra. We presentPyTranSpot, which we designed to model multiband transit light curves showing starspot anomalies, inferring both transit and spot parameters. The code follows a pixellation approach to model the star with its corresponding limb darkening, spots, and transiting planet on a two dimensional Cartesian coordinate grid. We combinePyTranSpotwith a Markov chain Monte Carlo framework to study and derive exoplanet transmission spectra, which provides statistically robust values for the physical properties and uncertainties of a transiting star-planet system. We validatePyTranSpot’s performance by analyzing eleven synthetic light curves of four different star-planet systems and 20 transit light curves of the well-studied WASP-41b system. We also investigate the impact of starspots on transit parameters and derive wavelength dependent transit depth values for WASP-41b covering a range of 6200−9200Å, indicating a flat transmission spectrum.
关键词：enplanetary systemsplanets and satellites: individual: WASP-41bplanets and satellites: fundamental parametersstarspotstechniques: photometric