Revised exoplanet radii from Gaia DR2

Gaia DR2 presents revised distances, luminosities, and radii for 1.6 billion stars. Here, we report the calculation of revised radii and densities for 320 non-Kepler exoplanets using this data and present updated calculations of the incident flux received by 690 known exoplanets.

This allows us to reassess the likelihood that those planets orbit in the habitable zone of their host stars. As a result of this analysis, three planets can be added to the catalog of potentially habitable worlds: HIP 67537b, HD 148156b, and HD 106720b. In addition, the changed parameterization of BD +49 898 means that its planet, BD +49 898b, now receives an incident flux that places it outside the optimistic habitable zone region, as defined by Kopparapu et al. We find that use of the new Gaia data results in a mean increase in the calculated exoplanet radius of 3.76%.