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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
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WRAP-Velocity-imaging-rapidly-precessing-planetary-disc-white-dwarf-Doppler-tomography-2021.pdf - Accepted Version - Requires a PDF viewer. Download (2089Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stab2948
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 | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of 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: |
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| Volume: | 508 | |||||||||||||||
| Number: | 4 | |||||||||||||||
| Page Range: | pp. 5657-5670 | |||||||||||||||
| DOI: | 10.1093/mnras/stab2948 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Publisher Statement: | 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 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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