Radius and mass distribution of ultra-short period planets

TL;DR

This study updates the properties of ultra-short period planets using Kepler and Gaia data, deriving their radius and mass distributions to shed light on their formation mechanisms.

Contribution

It provides the first comprehensive analysis of USP planet radius and mass distributions incorporating new Gaia data and advanced modeling techniques.

Findings

Updated USP planet host star properties with Gaia data

Derived occurrence rates for USP planets

Inferred mass distribution using spherical and tidally distorted models

Abstract

Ultra-short period (USP) planets are an enigmatic subset of exoplanets defined by having orbital periods $<$ 1 day. It is still not understood how USP planets form, or to what degree they differ from planets with longer orbital periods. Most USP planets have radii $<$ 2 $R_{\oplus}$, while planets that orbit further from their star extend to Jupiter size ($>$ 10 $R_{\oplus}$). Several theories attempt to explain the formation and composition of USP planets: they could be remnant cores of larger gas giants that lost their atmospheres due to photo-evaporation or Roche lobe overflow, or they could have developed through mass accretion in the innermost part of the protoplanetary disk. The radius and mass distribution of USP planets could provide important clues to distinguish between potential formation mechanisms. In this study, we first verify and update the Kepler catalog of USP planet host star properties, incorporating new data collected by the Gaia mission where applicable. We then use the transit depths measured by Kepler to derive a radius distribution and present occurrence rates for USP planets. Using spherical and tidally distorted planet models, we then derive a mass distribution for USP planets. Comparisons between the updated USP planet mass distribution and simulated planetary systems offer further insights into the formation and evolutionary processes shaping USP planet populations.