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Timing Characteristics of the Gamma-ray Emission from LS I +61303

F. Jaron
M. Massi, G. Torricelli-Ciamponi

Abstract:

The stellar binary system LS I +61303 is composed of a Be type star and a compact object of still unkown nature, i.e., black hole or neutron star, in an eccentric orbit with an orbital period of P1 = 26.4960 +/- 0.0028 days. The source is highly periodic all over the electromagnetic spectrum and is a particularly bright Fermi LAT source. Aimed at better understanding the physical processes responsible for the emission at GeV energies and its connection to the radio emission, we performed timing analysis of Fermi LAT data from the source. In this talk I will present our recent results and discuss a possible mechanism behind the gamma-ray emission.