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Pelisoli, I., Marsh, T.R., Parsons, S.G. orcid.org/0000-0002-2695-2654 et al. (14 more authors) (2022) Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii. Monthly Notices of the Royal Astronomical Society, 516 (4). pp. 5052-5066. ISSN 0035-8711
Abstract
AR Scorpii (AR Sco) is the only radio-pulsing white dwarf known to date. It shows a broad-band spectrum extending from radio to X-rays whose luminosity cannot be explained by thermal emission from the system components alone, and is instead explained through synchrotron emission powered by the spin-down of the white dwarf. We analysed NTT/ULTRACAM, TNT/ULTRASPEC, and GTC/HiPERCAM high-speed photometric data for AR Sco spanning almost seven years and obtained a precise estimate of the spin frequency derivative, now confirmed with 50-σ significance. Using archival photometry, we show that the spin-down rate of P/P˙=5.6×106 years has remained constant since 2005. As well as employing the method of pulse-arrival time fitting used for previous estimates, we also found a consistent value via traditional Fourier analysis for the first time. In addition, we obtained optical time-resolved spectra with WHT/ISIS and VLT/X-shooter. We performed modulated Doppler tomography for the first time for the system, finding evidence of emission modulated on the orbital period. We have also estimated the projected rotational velocity of the M-dwarf as a function of orbital period and found that it must be close to Roche lobe filling. Our findings provide further constraints for modelling this unique system.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This is an author-produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | binaries: general; cataclysmic variables; binaries: close; stars: individual: AR Scorpii |
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) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 01 Sep 2022 14:30 |
Last Modified: | 18 Nov 2022 01:41 |
Status: | Published |
Publisher: | Oxford University Press (OUP) |
Refereed: | Yes |
Identification Number: | 10.1093/mnras/stac2391 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:190531 |
Available Versions of this Item
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Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii. (deposited 01 Sep 2022 14:19)
- Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii. (deposited 01 Sep 2022 14:30) [Currently Displayed]