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Pelisoli, I., Marsh, T.R., Parsons, S.G. orcid.org/0000-0002-2695-2654 et al. (14 more authors) (Submitted: 2022) Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii. UNSPECIFIED. (Submitted)
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-sigma significance. Using archival photometry, we show that the spin down rate of P/Pdot = 5.6e6 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
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Copyright, Publisher and Additional Information: | © 2022 The Authors. For reuse permissions, please contact the Author(s). | ||||||
Keywords: | binaries: general; cataclysmic variables; binaries: close; stars: individual: AR Scorpii | ||||||
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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) | ||||||
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Depositing User: | Symplectic Sheffield | ||||||
Date Deposited: | 01 Sep 2022 14:19 | ||||||
Last Modified: | 01 Sep 2022 14:22 | ||||||
Status: | Submitted | ||||||
Identification Number: | https://doi.org/10.48550/arXiv.2208.08450 | ||||||
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Available Versions of this Item
- Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii. (deposited 01 Sep 2022 14:19) [Currently Displayed]