Planets intermediate in size between the Earth and Neptune, and orbiting closer to their host
stars than Mercury does the Sun, are the most common type of planet revealed by exoplanet …

At the dawn of the first discovery of exoplanets orbiting Sun-like stars in the mid-1990s, few
believed that observations of exoplanet atmospheres would ever be possible. After the 2002 …

The population of planets smaller than approximately 1.7 Earth radii (R⊕) is widely
interpreted as consisting of rocky worlds, generally referred to as super-Earths. This picture …

There are no planets intermediate in size between Earth and Neptune in our Solar System,
yet these objects are found around a substantial fraction of other stars. Population statistics …

We investigate a new class of habitable planets composed of water-rich interiors with
massive oceans underlying H 2-rich atmospheres, referred to here as Hycean worlds. With …

We show that terrestrial planets in the habitable zones of M dwarfs older than∼ 1 Gyr could
have been in runaway greenhouses for several hundred million years following their …

The size frequency distribution of exoplanet radii between 1 and 4R⊕ is bimodal with peaks
at∼ 1.4 R⊕ and∼ 2.4 R⊕, and a valley at∼ 1.8 R⊕. This radius valley separates two …

To aid in the physical interpretation of planetary radii constrained through observations of
transiting planets, or eventually direct detections, we compute model radii of pure hydrogen …

We use new interior models of cold planets to investigate the mass-radius relationships of
solid exoplanets, considering planets made primarily of iron, silicates, water, and carbon …

Ultracool dwarfs (UCD; T eff<∼ 3000 K) cool to settle on the main sequence after∼ 1 Gyr.
For brown dwarfs, this cooling never stops. Their habitable zones (HZ) thus sweeps inward …