43 citations · 91 across the 15 of their papers we have counts for
10 papers · 1 filter
I Can Do It With A Broken Planetesimal: Characterising the planetary debris in heavily polluted cool white dwarfs
Anna-Maria Cutolo, Boris T. Gänsicke, Andrew Swan +7
We present the analysis of four cool and strongly metal-polluted H-atmosphere white dwarfs observed with X-shooter. We compared their atmospheric parameters obtained from spectrosc…
Exogeological inferences from white dwarf pollutants: the impact of stellar physics
Andrew M. Buchan, Pier-Emmanuel Tremblay, Antoine Bédard +2
Many white dwarfs have accreted material from their own planetary systems. These objects can be used to infer the composition of exoplanetary material and identify evidence for key…
Measurements of three exo-planetesimal compositions: a planetary core, a chondritic body, and an icy Kuiper belt analogue
Jamie T. Williams, Boris T. Gänsicke, Snehalata Sahu +6
The study of planetesimal debris accreted by white dwarfs offers unique insights into the composition of exoplanets. Using far-ultraviolet and optical spectroscopy, we have analyse…
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…
Seven white dwarfs with circumstellar gas discs II: Tracing the composition of exoplanetary building blocks
L. K. Rogers, A. Bonsor, S. Xu +8
This second paper presents an in-depth analysis of the composition of the planetary material that has been accreted onto seven white dwarfs with circumstellar dust and gas emission…
Seven white dwarfs with circumstellar gas discs I: white dwarf parameters and accreted planetary abundances
L. K. Rogers, A. Bonsor, S. Xu +9
Observations of planetary material polluting the atmospheres of white dwarfs are an important probe of the bulk composition of exoplanetary material. Medium- and high-resolution op…
Rapid Formation of Exoplanetesimals Revealed by White Dwarfs
A. Bonsor, T. Lichtenberg, J. Drazkowska +1
The timing of formation for the first planetesimals determines the mode of planetary accretion and their geophysical and compositional evolution. Astronomical observations of circu…
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…
Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants
Andrew M. Buchan, Amy Bonsor, Oliver Shorttle +4
Polluted white dwarfs that have accreted planetary material provide a unique opportunity to probe the geology of exoplanetary systems. However, the nature of the bodies which pollu…
Bayesian constraints on the origin and geology of exo-planetary material using a population of externally polluted white dwarfs
John H. D. Harrison, Amy Bonsor, Mihkel Kama +3
White dwarfs that have accreted planetary bodies are a powerful probe of the bulk composition of exoplanetary material. In this paper, we present a Bayesian model to explain the ab…