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Detectable close-in planets around white dwarfs through late unpacking

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Veras, Dimitri and Gaensicke, B. T. (2014) Detectable close-in planets around white dwarfs through late unpacking. Monthly Notices of the Royal Astronomical Society, 447 (2). pp. 1049-1058. doi:10.1093/mnras/stu2475 ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1093/mnras/stu2475

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Abstract

Although 25–50 per cent of white dwarfs (WDs) display evidence for remnant planetary systems, their orbital architectures and overall sizes remain unknown. Vibrant close-in (≃1 R⊙) circumstellar activity is detected at WDs spanning many Gyr in age, suggestive of planets further away. Here we demonstrate how systems with 4 and 10 closely packed planets that remain stable and ordered on the main sequence can become unpacked when the star evolves into a WD and experience pervasive inward planetary incursions throughout WD cooling. Our full-lifetime simulations run for the age of the Universe and adopt main-sequence stellar masses of 1.5, 2.0 and 2.5 M⊙, which correspond to the mass range occupied by the progenitors of typical present-day WDs. These results provide (i) a natural way to generate an ever-changing dynamical architecture in post-main-sequence planetary systems, (ii) an avenue for planets to achieve temporary close-in orbits that are potentially detectable by transit photometry and (iii) a dynamical explanation for how residual asteroids might pollute particularly old WDs.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 19 December 2014
Dates:
DateEvent
19 December 2014Available
18 November 2014Modified
21 November 2014Accepted
26 October 2014Submitted
Volume: 447
Number: 2
Page Range: pp. 1049-1058
DOI: 10.1093/mnras/stu2475
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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