A Light Redback Companion of PSR J1622–0315 and Irradiation Power in Spider Systems

We report optical observations of the millisecond pulsar binary system PSR J1622–0315 with the Lulin 1 m telescope in Taiwan and the Lijiang 2.4 m telescope in China between 2019 and 2021. The companion of the pulsar, which is of V ∼ 19 mag, showed ellipsoidal-distorted orbital variations in its lig...

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Bibliographic Details
Published in:The Astrophysical journal 2023-09, Vol.955 (1), p.21
Main Authors: Yap, Y. X. Jane, Kong, Albert K. H., Li, Kwan-Lok
Format: Article
Language:English
Subjects:
Astrophysics
Binary codes
Compact binary stars
Irradiation
Light curve
Low-mass x-ray binary stars
Luminosity
Millisecond pulsars
Optical observations
Pulsars
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Summary:We report optical observations of the millisecond pulsar binary system PSR J1622–0315 with the Lulin 1 m telescope in Taiwan and the Lijiang 2.4 m telescope in China between 2019 and 2021. The companion of the pulsar, which is of V ∼ 19 mag, showed ellipsoidal-distorted orbital variations in its light curves. The best-fit model to the light curves, with the binary code PHOEBE , gives a companion mass of 0.122 ± 0.006 M ⊙ . This places PSR J1622–0315 in the spider-system subclass. We compared the properties of PSR J1622–0315 with other spider pulsar binaries for the scalings between the spin-down luminosity derived for the pulsar, irradiation luminosity of the companion, and X-ray luminosity of the binary. We find that pulsar irradiation in PSR J1622–0315 is insignificant and the irradiation luminosity of the transitional millisecond pulsars PSR J1023+0038 and PSR J1227–4853 are the highest among the redback systems.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/acea82