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The coronal X-ray - age relation and its implications for the evaporation of exoplanets
We study the relationship between coronal X-ray emission and stellar age for late-type stars, and the variation of this relationship with spectral type. We select 717 stars from 13 open clusters and…
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Planetary evaporation by UV and X‐ray radiation: basic hydrodynamics
We consider the evaporation of close-in planets by the star's intrinsic extreme-ultraviolet (EUV) and X-ray radiation. We calculate evaporation rates by solving the hydrodynamical problem for…
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Molecular Gas Clumps from the Destruction of Icy Bodies in the β Pictoris Debris Disk
TLDR
A highly asymmetric disk of dust and carbon monoxide orbiting the planet-hosting star, β Pictoris, delineates a region of enhanced collisions, either from a mean motion resonance with an unseen giant planet or from the remnants of a collision of Mars-mass planets.
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Lunar crater identification via deep learning
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Debris from terrestrial planet formation: the Moon-forming collision
We study the evolution of debris created in the giant impacts expected during the final stages of terrestrial planet formation. The starting point is the debris created in a simulation of the…
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The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations
We report 885 μm ALMA continuum flux densities for 24 Taurus members spanning the stellar/substellar boundary with spectral types from M4 to M7.75. Of the 24 systems, 22 are detected at levels…
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Gas and dust around A-type stars at tens of Myr: signatures of cometary breakup
Discs of dusty debris around main-sequence stars indicate fragmentation of orbiting planetesimals, and for a few A-type stars, a gas component is also seen that may come from collisionally released…
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Debris froms giant impacts between planetary embryos at large orbital radii
We consider the observational signatures of giant impacts between planetary embryos. While the debris released in the impact remains in a clump for only a single orbit, there is a much longer lasting…
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Ejection of rocky and icy material from binary star systems: implications for the origin and composition of 1I/‘Oumuamua
In single star systems like our own Solar system, comets dominate the mass budget of bodies that are ejected into interstellar space, since they form further away and are less tightly bound. However…
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Eight billion asteroids in the Oort cloud
The Oort cloud is usually thought of as a collection of icy comets inhabiting the outer reaches of the Solar system, but this picture is incomplete. We use simulations of the formation of the Oort…
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