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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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WRAP-dust-production-depletion-evolved-planetary-systems-Gaensicke-2018.pdf - Published Version - Requires a PDF viewer. Download (1708Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/sty2331
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 | ||||||||||||||||||||||||||||||
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| 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: |
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| Date of first compliant deposit: | 15 February 2019 | ||||||||||||||||||||||||||||||
| 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: |
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