Massi, M;Chernyakova, M;Kraus, A;Malyshev, D;Jaron, F;Kiehlmann, S;Dzib, SA;Sharma, R;Migliari, S;Readhead, ACS

2020

November

Monthly Notices Of The Royal Astronomical Society

Evidence for periodic accretion-ejection in LS I+61 degrees 303

Published

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RELATIVISTIC RADIO JET ACTIVE GALACTIC NUCLEI RAY BINARIES VARIABILITY EMISSION INDEX MODEL

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3592

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The stellar binary system LS I +61 degrees 303, composed of a compact object in an eccentric orbit around a B0 Ve star, emits from radio up to gamma-ray energies. The orbital modulation of radio spectral index, X-ray, and GeV gamma-ray data suggests the presence of two peaks. This two-peaked profile is in line with the accretion theory predicting two accretion-ejection events for LS I +61 degrees 303 along the 26.5 d orbit. However, the existing multiwavelength data are not simultaneous. In this paper, we report the results of a campaign covering radio, X-ray, and gamma-ray observations of the system along one single orbit. Our results confirm the two predicted events along the orbit and in addition show that the positions of radio and gamma-ray peaks are coincident with X-ray dips as expected for radio and gamma-ray emitting ejections depleting the X-ray emitting accretion flow. We discuss future observing strategies for a systematic study of the accretion-ejection physical processes in LS I +61 degrees 303.

OXFORD

0035-8711

10.1093/mnras/staa2623