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Optical photometry of two transitional millisecond pulsars in the radio pulsar state
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Stringer, J. G., Breton, R. P., Clark, C. J., Voisin, G., Kennedy, M. R., Mata Sánchez, D., Shahbaz, T., Dhillon, V.S., van Kerkwijk, M. and Marsh, T. R. (2021) Optical photometry of two transitional millisecond pulsars in the radio pulsar state. Monthly Notices of the Royal Astronomical Society, 507 (2). pp. 2174-2191. doi:10.1093/mnras/stab2167
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Official URL: https://doi.org/10.1093/mnras/stab2167
Abstract
We present ULTRACAM multiband optical photometry of two transitional millisecond pulsars (tMSPs), PSR J1023+0038 and PSR J1227−4853, taken while both were in their radio pulsar states. The light curves show significant asymmetry about the flux maxima in all observed bands, suggesting an asymmetric source of heating in the system. We model the light curves using the icarus binary code, using models with an additional ‘hotspot’ heating contribution and an anisotropic heat redistribution model to treat the asymmetry. Our modelling reveals companion stars with underfilled Roche lobes in both PSRs J1023+0038 and J1227−4853, with Roche lobe filling factors in the range f ∼ 0.82−0.92. While the volume-averaged filling factors are closer to unity, significant underfilling is unexpected from tMSPs as they must rapidly overfill their Roche lobes to start transferring mass, which occurs on time-scale of weeks or months. We discuss the motivation and validity of our extensions to the models and the implications of the underfilled Roche lobe, and suggest future work to further investigate the role of the filling factor in the tMSP cycle.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics T Technology > TR Photography |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Pulsars, Double stars -- Research, Stars -- Evolution, Neutrons, Multispectral imaging | ||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
| Publisher: | Oxford University Press | ||||||||||||
| ISSN: | 1745-3933 | ||||||||||||
| Official Date: | October 2021 | ||||||||||||
| Dates: |
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| Volume: | 507 | ||||||||||||
| Number: | 2 | ||||||||||||
| Page Range: | pp. 2174-2191 | ||||||||||||
| DOI: | 10.1093/mnras/stab2167 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Reuse Statement (publisher, data, author rights): | 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 J G Stringer, R P Breton, C J Clark, G Voisin, M R Kennedy, D Mata Sánchez, T Shahbaz, V S Dhillon, M van Kerkwijk, T R Marsh, Optical photometry of two transitional millisecond pulsars in the radio pulsar state, Monthly Notices of the Royal Astronomical Society, Volume 507, Issue 2, October 2021, Pages 2174–2191 is available online at: https://doi.org/10.1093/mnras/stab2167 | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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