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Velocity-imaging the rapidly precessing planetary disc around the white dwarf HE 1349–2305 using Doppler tomography

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Manser, Christopher J., Dennihy, Erik, Gaensicke, B. T., Debes, John H., Fusillo, Nicola P. Gentile, Hermes, J. J., Hollands, Mark A., Izquierdo, Paula, Kaiser, B. C., Marsh, T. R., Reding, Joshua S., Rodríguez-Gil, Pablo, Veras, Dimitri and Wilson, David J. (2021) Velocity-imaging the rapidly precessing planetary disc around the white dwarf HE 1349–2305 using Doppler tomography. Monthly Notices of the Royal Astronomical Society, 508 (4). pp. 5657-5670. doi:10.1093/mnras/stab2948 ISSN 1365-2966.

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Official URL: https://doi.org/10.1093/mnras/stab2948

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Abstract

The presence of planetary material in white dwarf atmospheres, thought to be accreted from a dusty debris disc produced via the tidal disruption of a planetesimal, is common. Approximately five per cent of these discs host a co-orbital gaseous component detectable via emission from atomic transitions – usually the 8600 Å Ca ii triplet. These emission profiles can be highly variable in both morphology and strength. Furthermore, the morphological variations in a few systems have been shown to be periodic, likely produced by an apsidally precessing asymmetric disc. Of the known gaseous debris discs, that around HE 1349–2305 has the most rapidly evolving emission line morphology, and we present updated spectroscopy of the Ca ii triplet of this system. The additional observations show that the emission line morphologies vary periodically and consistently, and we constrain the period to two aliases of 459 ± 3 d and 502 ± 3 d. We produce images of the Ca ii triplet emission from the disc in velocity space using Doppler tomography – only the second such imaging of a white dwarf debris disc. We suggest that the asymmetric nature of these velocity images is generated by gas moving on eccentric orbits with radially-dependent excitation conditions via photo-ionisation from the white dwarf. We also obtained short-cadence (≃ 4 min) spectroscopy to search for variability on the time-scale of the disc’s orbital period (≃ hours) due to the presence of a planetesimal, and rule out variability at a level of ≃ 1.4 per cent.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Accretion (Astrophysics), Protoplanetary disks , Circumstellar matter , White dwarf stars , Disks (Astrophysics)
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press (OUP)
ISSN: 1365-2966
Official Date: December 2021
Dates:
DateEvent
December 2021Published
13 October 2021Available
7 October 2021Accepted
Volume: 508
Number: 4
Page Range: pp. 5657-5670
DOI: 10.1093/mnras/stab2948
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Christopher J Manser, Erik Dennihy, Boris T Gänsicke, John H Debes, Nicola P Gentile Fusillo, J J Hermes, Mark Hollands, Paula Izquierdo, B C Kaiser, T R Marsh, Joshua S Reding, Pablo Rodríguez-Gil, Dimitri Veras, David J Wilson, Velocity-imaging the rapidly precessing planetary disc around the white dwarf HE 1349–2305 using Doppler tomography, Monthly Notices of the Royal Astronomical Society, Volume 508, Issue 4, December 2021, Pages 5657–5670 is available online at: https://doi.org/10.1093/mnras/stab2948
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 19 November 2021
Date of first compliant Open Access: 19 November 2021
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
UNSPECIFIEDImperial College Londonhttp://dx.doi.org/10.13039/501100000761
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
ST/T000406/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
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