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

How has the solar wind evolved to reach what it is today? In this review, I discuss the long-
term evolution of the solar wind, including the evolution of observed properties that are …

The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite
began surveying the sky in December 2019, with the aim of producing all-sky X-ray source …

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 …

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 …

Inspired by the Kepler mission's planet discoveries, we consider the thermal contraction of
planets close to their parent star, under the influence of evaporation. The mass-loss rates …

The composition of a planet's atmosphere is determined by its formation, evolution, and
present-day insolation. A planet's spectrum therefore may hold clues on its origins. We …

The radius distribution of small, close-in exoplanets has recently been shown to be bimodal.
The photoevaporation model predicted this bimodality. In the photoevaporation scenario …

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 …

The nature of the early martian climate is one of the major unanswered questions of
planetary science. Key challenges remain, but a new wave of orbital and in situ observations …