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

Xu, S. and Rappaport, S. and van Lieshout, R. and Vanderburg, A. and Gary, B. and Hallakoun, N. and Ivanov, V. D. and Wyatt, M. C. and DeVore, J. and Bayliss, D. and Bento, J. and Bieryla, A. and Cameron, A. and Cann, J. M. and Croll, B. and Collins, K. A. and Dalba, P. A. and Debes, J. and Doyle, D. and Dufour, P. and Ely, J. and Espinoza, N. and Joner, M. D. and Jura, M. and Kaye, T. and McClain, J. L. and Muirhead, P. and Palle, E. and Panka, P. A. and Provencal, J. and Randall, S. and Rodriguez, J. E. and Scarborough, J. and Sefako, R. and Shporer, A. and Strickland, W. and Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 and Zuckerman, B. (2017) 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

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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 μmbands 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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 07 Feb 2022 01:31
Last Modified: 14 Feb 2022 00:24
Uncontrolled Keywords: eclipses; minor planets; asteroids: general; stars: individual: WD; 1145+017; white dwarfs; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stx3023
URI: http://eprints.usq.edu.au/id/eprint/45036

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