geosciences Article A Quantitative Comparison of Exoplanet Catalogs Dolev Bashi 1,*, Ravit Helled 2 ID and Shay Zucker 1 1 School of Geosciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, 6997801 Tel Aviv, Israel;
[email protected] 2 Institute for Computational Science, Center for Theoretical Astrophysics and Cosmology, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;
[email protected] * Correspondence:
[email protected]; Tel.: +972-54-7365-965 Received: 30 July 2018; Accepted: 25 August 2018; Published: 29 August 2018 Abstract: In this study, we investigated the differences between four commonly-used exoplanet catalogs (exoplanet.eu; exoplanetarchive.ipac.caltech.edu; openexoplanetcatalogue.com; exoplanets.org) using a Kolmogorov–Smirnov (KS) test. We found a relatively good agreement in terms of the planetary parameters (mass, radius, period) and stellar properties (mass, temperature, metallicity), although a more careful analysis of the overlap and unique parts of each catalog revealed some differences. We quantified the statistical impact of these differences and their potential cause. We concluded that although statistical studies are unlikely to be significantly affected by the choice of catalog, it would be desirable to have one consistent catalog accepted by the general exoplanet community as a base for exoplanet statistics and comparison with theoretical predictions. Keywords: methods: statistical; astronomical data bases: miscellaneous; catalogs; planetary systems; stars: statistics 1. Introduction Since the detection of ‘51 Peg b’, the first exoplanet around a main sequence star [1], many more planets around other stars have been discovered. Currently, more than 3500 exoplanets have been detected in our galaxy.