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12 papers · 2 filters
The structure of protoplanetary discs around evolving young stars
Bertram Bitsch, Anders Johansen, Michiel Lambrechts +1
The formation of planets with gaseous envelopes takes place in protoplanetary accretion discs on time-scales of several millions of years. Small dust particles stick to each other…
Astrometric exoplanet detection with Gaia
Michael Perryman, Joel Hartman, Gáspár Bakos +1
We provide a revised assessment of the number of exoplanets that should be discovered by Gaia astrometry, extending previous studies to a broader range of spectral types, distances…
Separating gas-giant and ice-giant planets by halting pebble accretion
Michiel Lambrechts, Anders Johansen, Alessandro Morbidelli
In the Solar System giant planets come in two flavours: 'gas giants' (Jupiter and Saturn) with massive gas envelopes and 'ice giants' (Uranus and Neptune) with much thinner envelop…
Cosmic-ray exposure ages of fossil micrometeorites from mid-Ordovician sediments at Lynna River, Russia
Matthias M. M. Meier, Birger Schmitz, Anders Lindskog +2
We measured the He and Ne concentrations of 50 individual extraterrestrial chromite grains recovered from mid-Ordovician (lower Darriwilian) sediments from the Lynna River section…
Stellar irradiated discs and implications on migration of embedded planets III: viscosity transitions
Bertram Bitsch, Alessandro Morbidelli, Elena Lega +2
The migration strength and direction of embedded low-mass planets depends on the disc structure. In discs with an efficient radiative transport, the migration can be directed outwa…
Forming the cores of giant planets from the radial pebble flux in protoplanetary discs
Michiel Lambrechts, Anders Johansen
The formation of planetary cores must proceed rapidly in order for the giant planets to accrete their gaseous envelopes before the dissipation of the protoplanetary gas disc (<3 My…