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The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation
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Chandra, Vedant, Hwang, Hsiang-Chih, Zakamska, Nadia L., Blouin, Simon, Swan, Andrew, Marsh, Thomas R., Shen, Ken J., Gaensicke, Boris T., Hermes, J. J., Putterman, Odelia, Bauer, Evan B., Petrosky, Evan, Dhillon, Vikram S., Littlefair, Stuart P. and Ashley, Richard (2022) The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation. Monthly Notices of the Royal Astronomical Society, 512 (4). pp. 6122-6133. doi:10.1093/mnras/stac883 ISSN 1365-2966.
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WRAP-SN-runaway-LP-398-9-detection-circumstellar-material-surface-rotation-22.pdf - Accepted Version - Requires a PDF viewer. Download (1581Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac883
Abstract
A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary star explodes, the surviving donor can be spontaneously released as a hypervelocity runaway. One such runaway donor candidate is LP 398-9, whose orbital trajectory traces back ≈105 yr to a known supernova remnant. Here, we report the discovery of carbon-rich circumstellar material around LP 398-9, revealed by a strong infrared excess and analysed with follow-up spectroscopy. The circumstellar material is most plausibly composed of inflated layers from the star itself, mechanically and radioactively heated by the past companion’s supernova. We also detect a 15.4 h periodic signal in the UV and optical light curves of LP 398-9, which we interpret as surface rotation. The rotation rate is consistent with theoretical predictions from this supernova mechanism, and the brightness variations could originate from surface inhomogeneity deposited by the supernova itself. Our observations strengthen the case for this double-degenerate SNIa progenitor channel, and motivate the search for more runaway SNIa donors.
| Item Type: | Journal Article | ||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||
| Publisher: | Oxford University Press (OUP) | ||||||
| ISSN: | 1365-2966 | ||||||
| Official Date: | 13 April 2022 | ||||||
| Dates: |
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| Volume: | 512 | ||||||
| Number: | 4 | ||||||
| Page Range: | pp. 6122-6133 | ||||||
| DOI: | 10.1093/mnras/stac883 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Copyright Holders: | © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | ||||||
| Date of first compliant deposit: | 14 November 2022 | ||||||
| Date of first compliant Open Access: | 14 November 2022 | ||||||
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