Post-main-sequence evolution of A star debris discs

Amy Bonsor, Mark Wyatt

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The population of debris discs on the main sequence is well constrained, however very little is known about debris discs around evolved stars. In this work we provide a theoretical framework that considers the effects of stellar evolution on debris discs; firstly considering the evolution of an individual disc from the main sequence through to the white dwarf phase, then extending this to the known population of debris discs around main sequence A stars. It is found that discs around evolved stars are harder to detect than on the main sequence. In the context of our models discs should be detectable with Herschel or Alma on the giant branch, subject to the uncertain effect of sublimation on the discs. The best chances are for hot young white dwarfs, fitting nicely with the observations e.g the helix nebula (Su et al. 2007) and 9 systems presented by Chu & Bilikova.
Original languageEnglish
Pages (from-to)1631-1646
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date7 Dec 2010
Publication statusPublished - 21 Dec 2010

Bibliographical note

Part of PlanetsbeyondMS/2010 proceedings


  • astro-ph.EP


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