Exoplanets with substantial hydrogen/helium atmospheres have been discovered in
abundance, many residing extremely close to their parent stars. The extreme irradiation …

We advocate an integrative approach between laboratory experiments in prebiotic chemistry
and geologic, geochemical, and astrophysical observations to help assemble a robust …

The exoplanet population characterized by relatively short orbital periods (P< 100 d) around
solar-type stars is dominated by super-Earths and sub-Neptunes. However, these planets …

We have collected transit times for the TRAPPIST-1 system with the Spitzer Space
Telescope over four years. We add to these ground-based, HST, and K2 transit-time …

A new piece of evidence supporting the photoevaporation-driven evolution model for low-
mass, close-in exoplanets was recently presented by the California–Kepler Survey. The …

Abstract NASA's Kepler Space Telescope was designed to determine the frequency of Earth-
sized planets orbiting Sun-like stars, but these planets are on the very edge of the mission's …

Mass and radius are two of the most fundamental properties of an astronomical object.
Increasingly, new planet discoveries are being announced with a measurement of one of …

The masses and radii of exoplanets are fundamental quantities needed for their
characterisation. Studying the different populations of exoplanets is important for …

We present empirical measurements of the radii of 116 stars that host transiting planets.
These radii are determined using only direct observables—the bolometric flux at Earth, the …

We present an improved estimate of the occurrence rate of small planets orbiting small stars
by searching the full four-year Kepler data set for transiting planets using our own planet …