Pradeep, KG and Singh, KP and Dewangan, GC and Aydi, E and Barrett, PE and Buckley, DAH and Girish, V and Page, KL and Potter, SB and Schlegel, EM (2024) A multiwavelength study of Swift J0503.7-2819: a chimeric magnetic CV. In: Monthly Notices of the Royal Astronomical Society, 527 (1). pp. 774-789.
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Abstract
We present multiwavelength temporal and spectral characteristics of a magnetic cataclysmic variable (MCV) Swift J0503.7-2819, using far ultraviolet and X-ray data from AstroSat, supplemented with optical data from the Southern African Large Telescope and X-ray data from the XMM-Newton and Swift observatories. The X-ray modulations at 4897.6657 s and 3932.0355 s are interpreted as the orbital (PΩ) and spin (Pω) period, respectively, and are consistent with prior reports. With a spin-orbit period ratio of 0.8 and PΩ falling below the period gap (2–3 h) of CVs, Swift J0503.7-2819 would be the newest addition to the growing population of nearly synchronous MCVs, which we call EX Hya-like systems. Hard X-ray luminosity of <2.5 × 1032 erg s−1, as measured with the Swift Burst Alert Telescope, identifies it to be a low-luminosity intermediate polar, similar to other EX Hya-like systems. The phenomenology of the light curves and the spectral characteristics rule out a purely disc-fed/stream-fed model and instead reveal the presence of complex accretion structures around the white dwarf. We propose a ring-like accretion flow, akin to EX Hya, using period ratio, stability arguments, and observational features. An attempt is made to differentiate between the asynchronous polar/nearly synchronous intermediate polar nature of Swift J0503.7-2819. Further, we note that with the advent of sensitive surveys, a growing population of MCVs that exhibit characteristics of both polars and intermediate polars is beginning to be identified, likely forming a genealogical link between the two conventional classes of MCVs.
| Item Type: | Journal Article |
|---|---|
| Publication: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright for this article belongs to Oxford University Press. |
| Keywords: | Luminance; Telescopes, Accretion: accretion disks; Intermediate polars; Multi-wavelength study; Novae cataclysmic variables; Period ratios; Spectral characteristics; Star: individual: (SWIFT j0503.7-2819); Stars: individual: proxima Centauri; Stars: magnetic field; X ray data, White dwarfs |
| Department/Centre: | Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme |
| Date Deposited: | 28 Feb 2024 11:24 |
| Last Modified: | 28 Feb 2024 11:24 |
| URI: | https://eprints.iisc.ac.in/id/eprint/83615 |
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