SWIFT J0503.7-2819: a nearly synchronous intermediate polar below the period gap?

Nikita Rawat, J. C. Pandey, Arti Joshi, Simone Scaringi, Umesh Yadava

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5 Scopus citations


Based on the X-ray observations from XMM–Newton and Swift, and optical observations from Transiting Exoplanet Survey Satellite (TESS) and AAVSO, we present temporal and spectral properties of probable intermediate polar SWIFT J0503.7-2819. The X-ray light curve shows two distinctive features, where possibly the second pole seems to be active during the middle of the XMM–Newton observations. Present analysis confirms and also refines the previously reported orbital period of SWIFT J0503.7-2819 as 81.65 ± 0.04 min. The X-ray and optical variations of this target have been found to occur at the period of ∼65 min, which we propose as the spin period of the white dwarf. The energy-dependent modulation at this period, which are due to the photoelectric absorption in the accretion flow, also assures this conjecture. Two-temperature thermal plasma model well explains the X-ray spectra with temperatures of ∼150 eV and ∼18.5 keV, which is absorbed by a dense material with an average equivalent hydrogen column density of 3.8 × 1022 cm−2 that partially covers ∼27 per cent of the X-ray source. An attempt is made to understand the accretion flow in this system using the present data of SWIFT J0503.7-2819. If the proposed spin period is indeed the actual period, then SWIFT J0503.7-2819 could be the first nearly synchronous intermediate polar below the period gap.

Original languageEnglish
Pages (from-to)1667-1677
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Dec 1 2022


  • accretion, accretion discs
  • cataclysmic variables
  • stars: individual: (SWIFT J0503.7-2819)
  • stars: magnetic field


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