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Where are the magnetar binary companions? Candidates from a comparison with binary population synthesis predictions
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Chrimes, A. A., Levan, A. J., Fruchter, A. S., Groot, P. J., Jonker, P. G., Kouveliotou, C., Lyman, J. D., Stanway, Elizabeth R., Tanvir, N. R. and Wiersema, K. (2022) Where are the magnetar binary companions? Candidates from a comparison with binary population synthesis predictions. Monthly Notices of the Royal Astronomical Society, 513 (3). doi:10.1093/mnras/stac1090 ISSN 1745-3933.
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Official URL: https://doi.org/10.1093/mnras/stac1090
Abstract
It is well established that magnetars are neutron stars with extreme magnetic fields and young ages, but the evolutionary pathways to their creation are still uncertain. Since most massive stars are in binaries, if magnetars are a frequent result of core-collapse supernovae, some fraction are expected to have a bound companion at the time of observation. In this paper, we utilize literature constraints, including deep Hubble Space Telescope imaging, to search for bound stellar companions to magnetars. The magnitude and colour measurements are interpreted in the context of binary population synthesis predictions. We find two candidates for stellar companions associated with CXOU J171405.7–381031 and SGR 0755–2933, based on their J-H colours and H-band absolute magnitudes. Overall, the proportion of the Galactic magnetar population with a plausibly stellar near-infrared counterpart candidate, based on their magnitudes and colours, is between 5 and 10 per cent. This is consistent with a population synthesis prediction of 5 per cent, for the fraction of core-collapse neutron stars arising from primaries which remain bound to their companion after the supernova. These results are therefore consistent with magnetars being drawn in an unbiased way from the natal core-collapse neutron star population, but some contribution from alternative progenitor channels cannot be ruled out.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Neutron stars , Magnetars , Double stars | |||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||
Official Date: | July 2022 | |||||||||||||||
Dates: |
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Volume: | 513 | |||||||||||||||
Number: | 3 | |||||||||||||||
DOI: | 10.1093/mnras/stac1090 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 9 June 2022 | |||||||||||||||
Date of first compliant Open Access: | 10 June 2022 | |||||||||||||||
RIOXX Funder/Project Grant: |
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