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A dearth of small particles in the transiting material around the white dwarf WD 1145+017

Xu, S. and Shporer, A. (2018) A dearth of small particles in the transiting material around the white dwarf WD 1145+017. Monthly Notices of the Royal Astronomical Society, 474 (4). pp. 4795-4809. ISSN 0035-8711. doi:10.1093/mnras/stx3023.

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White dwarf WD 1145+017 is orbited by several clouds of dust, possibly emanating from actively disintegrating bodies. These dust clouds reveal themselves through deep, broad, and evolving transits in the star's light curve. Here, we report two epochs of multiwavelength photometric observations of WD 1145+017, including several filters in the optical, Ks and 4.5 μm bands in 2016 and 2017. The observed transit depths are different at these wavelengths. However, after correcting for excess dust emission at Ks and 4.5 μm, we find the transit depths for the white dwarf itself are the same at all wavelengths, at least to within the observational uncertainties of ∼5–10 per cent. From this surprising result, and under the assumption of low optical depth dust clouds, we conclude that there is a deficit of small particles (with radii s ≲ 1.5 μm) in the transiting material. We propose a model wherein only large particles can survive the high equilibrium temperature environment corresponding to 4.5 h orbital periods around WD 1145+017, while small particles sublimate rapidly. In addition, we evaluate dust models that are permitted by our measurements of infrared emission.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Xu, S.0000-0002-8808-4282
Shporer, A.0000-0002-1836-3120
Additional Information:© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 November 14. Received 2017 November 14; in original form 2017 August 9. We thank the Spitzer helpdesk for useful discussions about high-precision photometry. The paper was based on observations made with (i) the Spitzer Space Telescope under programme no. 12128 and no. 13065, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with National Aeronautics and Space Administration (NASA). Support for this work was provided by NASA through an award issued by JPL/Caltech. (ii) The European Organisation for Astronomical Research in the Southern Hemisphere under European Southern Observatory (ESO) programme 296.C-5024 and 099.C-0082. This work also uses observations from the Las Cumbres Observatory (LCO) network. RvL acknowledges support from the European Union through ERC grant numbers 279973 and 341137. AC acknowledges support from STFC grant ST/M001296/1.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Southern Observatory (ESO)296.C-5024
European Southern Observatory (ESO)099.C-0082
European Research Council (ERC)279973
European Research Council (ERC)341137
Science and Technology Facilities Council (STFC)ST/M001296/1
Subject Keywords:eclipses, minor planets, asteroids: general, stars: individual: WD 1145+017, white dwarfs
Issue or Number:4
Record Number:CaltechAUTHORS:20180301-153321794
Persistent URL:
Official Citation:S Xu(许偲艺), S Rappaport, R van Lieshout, A Vanderburg, B Gary, N Hallakoun, V D Ivanov, M C Wyatt, J DeVore, D Bayliss, J Bento, A Bieryla, A Cameron, J M Cann, B Croll, K A Collins, P A Dalba, J Debes, D Doyle, P Dufour, J Ely, N Espinoza, M D Joner, M Jura, T Kaye, J L McClain, P Muirhead, E Palle, P A Panka, J Provencal, S Randall, J E Rodriguez, J Scarborough, R Sefako, A Shporer, W Strickland, G Zhou, B Zuckerman; A dearth of small particles in the transiting material around the white dwarf WD 1145+017, Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 4, 11 March 2018, Pages 4795–4809,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85046
Deposited By: Ruth Sustaita
Deposited On:02 Mar 2018 00:19
Last Modified:15 Nov 2021 20:25

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