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Infrared variability of two dusty white dwarfs
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Xu, Siyi, Su, Kate Y. L., Rogers, Laura, Bonsor, Amy, Olofsson, Johan, Veras, Dimitri, van Lieshout, Rik, Dufour, Patrick, Green, Elizabeth M., Schlawin, Everett, Farihi, Jay, Wilson, Thomas G., Wilson, David J. and Gaensicke, B. T. (2018) Infrared variability of two dusty white dwarfs. The Astrophysical Journal, 866 (2). 108. doi:10.3847/1538-4357/aadcfe ISSN 0004-637X.
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Official URL: https://doi.org/10.3847/1538-4357/aadcfe
Abstract
The most heavily polluted white dwarfs often show excess infrared radiation from circumstellar dust disks, which are modeled as a result of tidal disruption of extrasolar minor planets. Interaction of dust, gas, and disintegrating objects can all contribute to the dynamical evolution of these dust disks. Here, we report two infrared variable dusty white dwarfs, SDSS J1228+1040 and G29-38. For SDSS J1228+1040, compared to the first measurements in 2007, the IRAC [3.6] and [4.5] fluxes decreased by 20% before 2014 to a level also seen in the recent 2018 observations. For G29-38, the infrared flux of the 10 μm silicate emission feature became 10% stronger between 2004 and 2007, We explore several scenarios that could account for these changes, including tidal disruption events, perturbation from a companion, and runaway accretion. No satisfactory causes are found for the flux drop in SDSS J1228+1040 due to the limited time coverage. Continuous tidal disruption of small planetesimals could increase the mass of small grains and concurrently change the strength of the 10 μm feature of G29-38. Dust disks around white dwarfs are actively evolving and we speculate that there could be different mechanisms responsible for the temporal changes of these disks.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Asteroids, Circumstellar matter | ||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||
| ISSN: | 0004-637X | ||||||||||||||||||
| Official Date: | 17 October 2018 | ||||||||||||||||||
| Dates: |
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| Volume: | 866 | ||||||||||||||||||
| Number: | 2 | ||||||||||||||||||
| Article Number: | 108 | ||||||||||||||||||
| DOI: | 10.3847/1538-4357/aadcfe | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
| Date of first compliant deposit: | 24 September 2018 | ||||||||||||||||||
| Date of first compliant Open Access: | 3 January 2019 | ||||||||||||||||||
| Funder: | Universidad Católica de Valparaíso | ||||||||||||||||||
| Grant number: | Núcleo Milenio de Formación Planetaria grant | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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