Unveiling the super-orbital modulation of LSI +61 303 in X-rays
Jian Li, Diego F. Torres, Shu Zhang, Daniela Hadasch, Nanda Rea, G., Andrea Caliandro, Yupeng Chen, and Jianmin Wang
TL;DR
This paper reports the detection of super-orbital modulation in the X-ray emission of LS I +61 303, revealing a 1667-day period and a phase shift relative to radio observations, based on extensive RXTE data.
Contribution
It presents the first evidence of super-orbital modulation in X-ray emission of LS I +61 303 with detailed phase shift analysis, expanding understanding of its variability.
Findings
Super-orbital period of 1667 days fitted with sinusoidal model
Detected a phase shift of approximately 282 days between radio and X-ray modulations
Confirmed super-orbital modulation in maximum count rate of orbital light curves
Abstract
We found evidence for the super-orbital modulation in the X-ray emission of LS I +61 303 from the longest monitoring date by the RXTE. The time evolution of the modulated fraction in the orbital light curves can be well fitted with a sinusoidal function having a super-orbital period of 1667 days. However, we have found a 281.8+/-44.6 day shift between the super-orbital variability found at radio frequencies and our X-ray data. We also find a super-orbital modulation in the maximum count rate of the orbital light curves, compatible with the former results, including the shift.
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