98 citations · 397 across the 11 of their papers we have counts for
11 papers
White dwarf constraints on geological processes at the population level
Andrew M. Buchan, Amy Bonsor, Laura K. Rogers +3
White dwarf atmospheres are frequently polluted by material from their own planetary systems. Absorption features from Ca, Mg, Fe and other elements can provide unique insights int…
How planets form by pebble accretion V. Silicate rainout delays contraction of sub-Neptunes
A. Vazan, C. W. Ormel, M. G. Brouwers
The characterization of Super-Earth-to-Neptune sized exoplanets relies heavily on our understanding of their formation and evolution. In this study, we link a model of planet forma…
Asynchronous accretion can mimic diverse white dwarf pollutants I: core and mantle fragments
Marc G. Brouwers, Amy Bonsor, Uri Malamud
Polluted white dwarfs serve as astrophysical mass spectrometers - their photospheric abundances are used to infer the composition of planetary objects that accrete onto them. We sh…
Asynchronous accretion can mimic diverse white dwarf pollutants II: water content
Marc G. Brouwers, Andrew M. Buchan, Amy Bonsor +3
Volatiles, notably water, are key to the habitability of rocky planets. The presence of water in planetary material can be inferred from the atmospheric oxygen abundances of pollut…
Prograde spin-up during gravitational collapse
Rico G. Visser, Marc G. Brouwers
Asteroids, planets, stars in some open clusters, as well as molecular clouds appear to possess a preferential spin-orbit alignment, pointing to shared processes that tie their rota…
A road-map to white dwarf pollution: Tidal disruption, eccentric grind-down, and dust accretion
Marc G. Brouwers, Amy Bonsor, Uri Malamud
A significant fraction of white dwarfs show metal lines indicative of pollution with planetary material but the accretion process remains poorly understood. The main aim of this pa…
How planets grow by pebble accretion IV: Envelope opacity trends from sedimenting dust and pebbles
M. G. Brouwers, C. W. Ormel, A. Bonsor +1
The amount of nebular gas that a planet can bind is limited by its cooling rate, which is set by the opacity of its envelope. Accreting dust and pebbles contribute to the envelope…
Circularization of tidal debris around white dwarfs: implications for gas production and dust variability
Uri Malamud, Evgeni Grishin, Marc Brouwers
White dwarf (WD) pollution is thought to arise from the tidal disruption of planetary bodies. The initial fragment stream is extremely eccentric, while observational evidence sugge…
How planets grow by pebble accretion. III. Emergence of an interior composition gradient
Chris Ormel, Allona Vazan, Marc Brouwers
During their formation, planets form large, hot atmospheres due to the ongoing accretion of solids. It has been customary to assume that all solids end up at the center constitutin…
How planets grow by pebble accretion II: Analytical calculations on the evolution of polluted envelopes
M. G. Brouwers, C. W. Ormel
Proto-planets embedded in their natal disks acquire hot envelopes as they grow and accrete solids. This ensures that the material they accrete - pebbles, as well as (small) planete…
How cores grow by pebble accretion I. Direct core growth
M. G. Brouwers, A. Vazan, C. W. Ormel
Context: Planet formation by pebble accretion is an alternative to planetesimal-driven core accretion. In this scenario, planets grow by accreting cm-to-m-sized pebbles instead of…