VLBI Astrometry on the White Dwarf Pulsar AR Scorpii

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aut.relation.endpage2951
aut.relation.issue2
aut.relation.journalMonthly Notices of the Royal Astronomical Society
aut.relation.startpage2942
aut.relation.volume520
dc.contributor.authorJiang, Pengfei
dc.contributor.authorCui, Lang
dc.contributor.authorYang, Jun
dc.contributor.authorZhang, Bo
dc.contributor.authorXu, Shuangjing
dc.contributor.authorShu, Fengchun
dc.contributor.authorJiang, Wu
dc.contributor.authorChen, Wen
dc.contributor.authorLi, Guanghui
dc.contributor.authorXia, Bo
dc.contributor.authorWeston, Stuart
dc.contributor.authorGulyaev, Sergei
dc.contributor.authorCao, Hongmin
dc.contributor.authorLiu, Xiang
dc.contributor.authorAn, Tao
dc.date.accessioned2023-06-14T01:30:40Z
dc.date.available2023-06-14T01:30:40Z
dc.date.issued2023-01-30
dc.description.abstract<jats:p>Abstract</jats:p> <jats:p>AR Scorpii (AR Sco), the only-known radio-pulsing white dwarf binary, shows unusual pulsating emission at the radio, infrared, optical, and ultraviolet bands. To determine its astrometric parameters at the radio band independently, we conducted multi-epoch Very Long Baseline Interferometry (VLBI) phase-referencing observations with the European VLBI Network at 5 GHz and the Chinese VLBI Network plus the Warkworth 30-m telescope (New Zealand) at 8.6 GHz. By using the differential VLBI astrometry, we provide high-precision astrometric measurements on the parallax ($\pi =8.52_{-0.07}^{+0.04}$ mas) and proper motion ($\mu _{\alpha }=9.48_{-0.07}^{+0.04}$ mas yr−1, $\mu _{\delta }=-51.32_{-0.38}^{+0.22}$ mas yr−1). The new VLBI results agree with the optical Gaia astrometry. Our kinematic analysis reveals that the Galactic space velocities of AR Sco are quite consistent with that of both intermediate polars and polars. Combined with the previous tightest VLBI constraint on the size, our parallax distance suggests that the radio emission of AR Sco should be located within the light cylinder of its white dwarf.</jats:p>
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, ISSN: 0035-8711 (Print); 1365-2966 (Online), Oxford University Press (OUP), 520(2), 2942-2951. doi: 10.1093/mnras/stad327
dc.identifier.doi10.1093/mnras/stad327
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.urihttps://hdl.handle.net/10292/16270
dc.languageen
dc.publisherOxford University Press (OUP)
dc.relation.urihttps://academic.oup.com/mnras/article/520/2/2942/7010763
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society.
dc.rights.accessrightsOpenAccess
dc.subject5101 Astronomical Sciences
dc.subject51 Physical Sciences
dc.subject0201 Astronomical and Space Sciences
dc.subjectAstronomy & Astrophysics
dc.subject5101 Astronomical sciences
dc.subject5107 Particle and high energy physics
dc.subject5109 Space sciences
dc.titleVLBI Astrometry on the White Dwarf Pulsar AR Scorpii
dc.typeJournal Article
pubs.elements-id502603
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