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Chandra, V., Hwang, H.-C., Zakamska, N.L. et al. (12 more authors) (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. ISSN 0035-8711
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Author(s). Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | circumstellar matter; stars: rotation; supernovae: general; white dwarfs |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number Science and Technology Facilities Council ST/V000853/1 European Research Council 340040 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 16 Jun 2022 13:32 |
Last Modified: | 27 Jan 2023 17:06 |
Status: | Published |
Publisher: | Oxford University Press (OUP) |
Refereed: | Yes |
Identification Number: | 10.1093/mnras/stac883 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188097 |
Available Versions of this Item
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The SNIa runaway LP 398-9: detection of circumstellar material and surface rotation. (deposited 03 Nov 2021 14:17)
- The SN Ia runaway LP 398-9 : detection of circumstellar material and surface rotation. (deposited 16 Jun 2022 13:32) [Currently Displayed]