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arXiv · 2401.16180

Identifying reliable periods in 2MASS J09213414-5939068, IGR J16167-4957, and V667 Pup

Arti Joshi
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Abstract

Detailed timing analyses of three cataclysmic variables, namely 2MASS J09213414$-$5939068, IGR J16167$-$4957, and V667 Pup are carried out using the long-baseline and high-cadence optical photometric data from the Transiting Exoplanet Survey Satellite (TESS). Periods of 908.12$\pm$0.05 s and 990.10$\pm$0.06 s are observed in the optical variation of 2MASS J09213414$-$5939068 that were not found in earlier studies and appear to be probable spin and beat periods of the system, respectively. The presence of multiple periods at spin, beat, and other sidebands indicates that 2MASS J09213414$-$5939068 likely belongs to an intermediate polar class of magnetic cataclysmic variables that seems to be accreted via a disc-overflow mechanism. Clear evidence of a period of 582.45$\pm$0.04 s is found during the TESS observations of IGR J16167$-$4957, which can be interpreted as the spin period of the system. Strong modulation at this frequency supports its classification as an intermediate polar, where accretion may primarily be governed by a disc. The dominance of the spin pulse unveils the disc-fed dominance accretion in V667 Pup, but the detection of the previously unknown beat period of 525.77$\pm$0.03 s suggests that a portion of the material is also accreted through a stream. Moreover, the double-peaked structure observed in the optical spin pulse profile of V667 Pup suggests the possibility of a two-pole accretion geometry, where each pole accretes at a different rate and is separated by 180$^\circ$.

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Arti Joshi. 2024-01-29. Identifying reliable periods in 2MASS J09213414-5939068, IGR J16167-4957, and V667 Pup. https://arxiv.org/abs/2401.16180

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