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Author

Ketan Rikame

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Preprint Oct 2026

Dynamical constraints on the companion mass from pulsar timing and cyclotron line confirmation in the SFXT IGR J16418-4532

Supergiant Fast X-ray Transients (SFXTs) exhibit extreme X-ray variability on short timescales of minutes to hours, driven by accretion processes that are still poorly understood. IGR J16418–4532 is an intermediate SFXT in which X-ray pulsations have been detected and which has been proposed as a candidate cyclotron...

A. Devaraj, Rahul Sharma, Ketan Rikame et al. · 0 citations
Preprint Sep 2026

Detection of hard X-ray pulsations in non-ULX X-ray pulsar 3X J0042 in M31

We report the detection of hard X-ray pulsations from the M31 accreting non-ULX X-ray pulsar 3X J0042 (3XMM J004232.1+411314) using archival NuSTAR observations. The source has a spin period of ~3 s and an orbital period of ~4.15 hr, with coherent pulsations previously detected only in XMM-Newton observations. We reana...

Ketan Rikame, Biswajit Paul · 0 citations

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