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17 papers · 2 filters
Debris Disc Constraints on Planetesimal Formation
Alexander V. Krivov, Aljoscha Ide, Torsten Löhne +2
Two basic routes for planetesimal formation have been proposed over the last few decades. One is a classical "slow-growth" scenario. Another one is particle concentration models, i…
The Pan-Pacific Planet Search VII: The most eccentric planet orbiting a giant star
Robert A. Wittenmyer, M. I. Jones, Jonathan Horner +9
Radial velocity observations from three instruments reveal the presence of a 4 M_jup planet candidate orbiting the K giant HD 76920. HD 76920b has an orbital eccentricity of 0.856$…
Planet population synthesis driven by pebble accretion in cluster environments
Nelson Ndugu, Bertram Bitsch, Edward Jurua
The evolution of protoplanetary discs embedded in stellar clusters depends on the age and the stellar density in which they are embedded. Stellar clusters of young age and high ste…
Unstable low-mass planetary systems as drivers of white dwarf pollution
Alexander J Mustill, Eva Villaver, Dimitri Veras +2
At least 25% of white dwarfs show atmospheric pollution by metals, sometimes accompanied by detectable circumstellar dust/gas discs or (in the case of WD 1145+017) transiting disin…
Evidence for the formation of comet 67P/Churyumov-Gerasimenko through gravitational collapse of a bound clump of pebbles
Jürgen Blum, Bastian Gundlach, Maya Krause +19
The processes that led to the formation of the planetary bodies in the Solar System are still not fully understood. Using the results obtained with the comprehensive suite of instr…
Circularizing Planet Nine through dynamical friction with an extended, cold planetesimal belt
Linn E. J. Eriksson, Alexander J. Mustill, Anders Johansen
Unexpected clustering in the orbital elements of minor bodies beyond the Kuiper belt has led to speculations that our solar system actually hosts nine planets, the eight establishe…