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Abstract: I derive the physical properties of 30 transiting extrasolar planetarysystems using a homogeneous analysis of published data. The light curves aremodelled with the JKTEBOP code, with attention paid to limb darkening andeccentricity. The light from some systems is contaminated by faint nearbystars, which if ignored will systematically bias the results. I show that thismust be accounted for using external measurements of the amount ofcontaminating light. A contamination of 5% is enough to make the measurement ofa planetary radius 2% too low. The physical properties of the 30 transitingsystems are obtained by interpolating in stellar model predictions to find thebest match to their measured quantities. The error budgets are used to compilea list of systems which would benefit from additional observations. Thesystematic errors arising from the inclusion of stellar models are assessed byusing five different theoretical models. This model dependence sets a lowerlimit on the accuracy of measurements of the system properties, and at worst is1% for the stellar mass. The correlations of planetary surface gravity and masswith orbital period have significance levels of only 3.1 sigma and 2.3 sigma.The division of planets into two classes based on Safronov number isincreasingly blurred. Most of the objects studied here would benefit from morephotometry and-or spectroscopy, as well as a better understanding of low-massstars.



Author: John Southworth Keele University, UK

Source: https://arxiv.org/







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