# Study of orbital and superorbital variability of LSI +61 303 with X-ray data

## TL;DR

This study analyzes X-ray data from multiple observatories to understand the orbital and superorbital variability of the binary system LSI +61 303, focusing on absorption profiles and short-term variability to elucidate high-energy emission mechanisms.

## Contribution

It provides a systematic analysis of archival X-ray data to characterize absorption and variability patterns in LSI +61 303, advancing understanding of its high-energy activity.

## Key findings

- Absorption profile varies with orbital and superorbital phases.
- Short-term variability observed, indicating dynamic physical processes.
- Insights into the interaction between the compact object and Be star disk.

## Abstract

LSI +61 303 is one of the few X-ray binaries with a Be star companion from which radio, X-rays and high-energy gamma-ray (GeV and TeV) emission have been observed. The nature of the high energy activity of the system is not yet fully understood, but it is widely believed that it is generated due to the interaction of the relativistic electrons leaving the compact object with the photons and non-relativistic wind of the Be star. The superorbital variability of the system has been observed in the radio, optical and X-ray domains and could be due to the cyclic change of the Be star disk size. In this paper we systematically review all publicly available data from Suzaku, XMM-Newton, Chandra and Swift observatories in order to measure the absorption profile of the circumstellar Be disk as a function of orbital and superorbital phases. We also discuss short-term variability of the system, found during the analysis and its implications for the understanding of the physical processes in this system.