Details

Autor(en) / Beteiligte

• Swan, Andrew
• Kenyon, Scott J
• Farihi, Jay
• Dennihy, Erik
• Gänsicke, Boris T
• Hermes, J J
• Melis, Carl
• von Hippel, Ted

Titel

Collisions in a gas-rich white dwarf planetary debris disc

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2021-09, Vol.506 (1), p.432-440

Ort / Verlag

England: Oxford University Press

Erscheinungsjahr

2021

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• WD 0145+234 is a white dwarf that is accreting metals from a circumstellar disc of planetary material. It has exhibited a substantial and sustained increase in 3-5 [Formula: see text]m flux since 2018. Follow-up photometry reveals that emission from the disc had begun to decrease by late 2019. Stochastic brightening events superimposed on the decline in brightness suggest the liberation of dust during collisional evolution of the circumstellar solids. A simple model is used to show that the observations are indeed consistent with ongoing collisions. Rare emission lines from circumstellar gas have been detected at this system, supporting the emerging picture of white dwarf debris discs as sites of collisional gas and dust production.