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Relentless and complex transits from a planetesimal debris disc

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Farihi, J., Hermes, J. J., Marsh, T. R., Mustill, A. J., Wyatt, M. C., Guidry, J. A., Wilson, T. G., Redfield, S., Izquierdo, P., Toloza, O., Gänsicke, B. T. (Boris T.), Aungwerojwit, A., Kaewmanee, C., Dhillon, V. S. and Swan, A. (2022) Relentless and complex transits from a planetesimal debris disc. Monthly Notices of the Royal Astronomical Society, 511 (2). pp. 1647-1666. doi:10.1093/mnras/stab3475 ISSN 1745-3933.

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Official URL: http://dx.doi.org/10.1093/mnras/stab3475

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Abstract

This article reports quasi-continuous transiting events towards WD 1054–226 at d = 36.2 pc and V = 16.0 mag, based on simultaneous, high-cadence, multiwavelength imaging photometry using ULTRACAM over 18 nights from 2019 to 2020 March. The predominant period is 25.02 h and corresponds to a circular orbit with blackbody Teq = 323 K, where a planetary surface can nominally support liquid water. The light curves reveal remarkable night-to-night similarity, with changes on longer time-scales, and lack any transit-free segments of unocculted starlight. The most pronounced dimming components occur every 23.1 min – exactly the 65th harmonic of the fundamental period – with depths of up to several per cent, and no evident colour dependence. Myriad additional harmonics are present, as well as at least two transiting features with independent periods. High-resolution optical spectra are consistent with stable, photospheric absorption by multiple, refractory metal species, with no indication of circumstellar gas. Spitzer observations demonstrate a lack of detectable dust emission, suggesting that the otherwise hidden circumstellar disc orbiting WD 1054–226 may be typical of polluted white dwarfs, and detected only via favourable geometry. Future observations are required to constrain the orbital eccentricity, but even if periastron is near the Roche limit, sublimation cannot drive mass loss in refractory parent bodies, and collisional disintegration is necessary for dust production.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Interstellar matter, White dwarf stars, Planets, Stars -- Evolution
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: 8 February 2022
Dates:
DateEvent
8 February 2022Published
26 November 2021Accepted
13 September 2021Submitted
Volume: 511
Number: 2
Page Range: pp. 1647-1666
DOI: 10.1093/mnras/stab3475
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: The Author(s)
Date of first compliant deposit: 28 March 2022
Date of first compliant Open Access: 30 March 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/R000476/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
80NSSC20K0592TESS Guest Investigator ProgramUNSPECIFIED
ST/T000406/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDLeverhulme Research FellowshipUNSPECIFIED
2017–04945Vetenskapsrådethttp://dx.doi.org/10.13039/501100004359
ST/M001296/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
FRB640025Thailand Science Research and InnovationUNSPECIFIED
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271

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