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Dust production and depletion in evolved planetary systems

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Farihi, J., van Lieshout, R., Cauley, P. W., Dennihy, E., Su, K. Y. L., Kenyon, S. J., Wilson, T. G., Toloza, Odette, Gänsicke, B. T. (Boris T.), von Hippel, T., Redfield, S., Debes, J. H., Xu, S., Rogers, L., Bonsor, A., Swan, A., Pala, Anna F. and Reach, W. T. (2018) Dust production and depletion in evolved planetary systems. Monthly Notices of the Royal Astronomical Society, 481 (2). pp. 2601-2611. doi:10.1093/mnras/sty2331

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Official URL: https://doi.org/10.1093/mnras/sty2331

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Abstract

The infrared dust emission from the white dwarf GD 56 is found to rise and fall by 20 per cent peak-to-peak over 11.2 yr, and is consistent with ongoing dust production and depletion. It is hypothesized that the dust is produced via collisions associated with an evolving dust disc, temporarily increasing the emitting surface of warm debris, and is subsequently destroyed or assimilated within a few years. The variations are consistent with debris that does not change temperature, indicating that dust is produced and depleted within a fixed range of orbital radii. Gas produced in collisions may rapidly re-condense onto grains, or may accrete onto the white dwarf surface on viscous timescales that are considerably longer than Poynting–Robertson drag for micron-sized dust. This potential delay in mass accretion rate change is consistent with multi-epoch spectra of the unchanging Ca II and Mg II absorption features in GD 56 over 15 yr, although the sampling is sparse. Overall, these results indicate that collisions are likely to be the source of dust and gas, either inferred or observed, orbiting most or all polluted white dwarfs.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): White dwarf stars, Circumstellar matter
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press (OUP)
ISSN: 1365-2966
Official Date: 1 December 2018
Dates:
DateEvent
1 December 2018Published
27 August 2018Available
23 August 2018Accepted
Volume: 481
Number: 2
Page Range: pp. 2601-2611
DOI: 10.1093/mnras/sty2331
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©:2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
Keck PI Data Award[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
ST/R000476/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
341137European Research Councilhttp://viaf.org/viaf/130022607
Studentship[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
320964 (WDTracer)Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
AST-1715718National Science Foundationhttp://dx.doi.org/10.13039/100000001
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
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