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

Abstract 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 obse...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2018-03, Vol.474 (4), p.4795-4809
Hauptverfasser: Xu(许偲艺), S, Rappaport, S, van Lieshout, R, Vanderburg, A, Gary, B, Hallakoun, N, Ivanov, V D, Wyatt, M C, DeVore, J, Bayliss, D, Bento, J, Bieryla, A, Cameron, A, Cann, J M, Croll, B, Collins, K A, Dalba, P A, Debes, J, Doyle, D, Dufour, P, Ely, J, Espinoza, N, Joner, M D, Jura, M, Kaye, T, McClain, J L, Muirhead, P, Palle, E, Panka, P A, Provencal, J, Randall, S, Rodriguez, J E, Scarborough, J, Sefako, R, Shporer, A, Strickland, W, Zhou, G, Zuckerman, B
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container_issue 4
container_start_page 4795
container_title Monthly notices of the Royal Astronomical Society
container_volume 474
creator Xu(许偲艺), S
Rappaport, S
van Lieshout, R
Vanderburg, A
Gary, B
Hallakoun, N
Ivanov, V D
Wyatt, M C
DeVore, J
Bayliss, D
Bento, J
Bieryla, A
Cameron, A
Cann, J M
Croll, B
Collins, K A
Dalba, P A
Debes, J
Doyle, D
Dufour, P
Ely, J
Espinoza, N
Joner, M D
Jura, M
Kaye, T
McClain, J L
Muirhead, P
Palle, E
Panka, P A
Provencal, J
Randall, S
Rodriguez, J E
Scarborough, J
Sefako, R
Shporer, A
Strickland, W
Zhou, G
Zuckerman, B
description Abstract 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.
doi_str_mv 10.1093/mnras/stx3023
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subjects Clouds
Disintegration
Dust
Dust clouds
Emission
Emission measurements
Light curve
Optical analysis
Orbits
Particulates
Photometry
Stellar evolution
Transits
Wavelengths
White dwarf stars
title A dearth of small particles in the transiting material around the white dwarf WD 1145+017
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