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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

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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
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:
DateEvent
17 October 2018Published
24 August 2018Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
ST/P003850/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
1180395[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
(FP/2007-2013)/ERC Grant Agreement 320964Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
Dorothy Hodgkin Fellowship [RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
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