Evidence for periodic accretion–ejection in LS I +61°303
Abstract
The stellar binary system LS I +61°303, composed of a compact object in an eccentric orbit around a B0 Ve star, emits from radio up to γ-ray energies. The orbital modulation of radio spectral index, X-ray, and GeV γ-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°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 γ-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 γ-ray peaks are coincident with X-ray dips as expected for radio and γ-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°303.
Additional Information
© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2020 August 24. Received 2020 July 30; in original form 2019 July 22. Published: 27 August 2020. FJ thanks Walter Alef and Helge Rottmann for providing computer power at the MPIfR high performance computer cluster. We thank Eduardo Ros for reading the manuscript and providing helpful comments. This research has made use of observations with the 100-m telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) at Effelsberg, Fermi–LAT data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by National Aeronautics and Space Administration (NASA) Goddard Space Flight Center, XMM-Newton data, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA, OVRO 40-m monitoring program supported in part by NASA grants NNX08AW31G, NNX11A043G, and NNX14AQ89G and NSF grants AST-0808050 and AST-1109911. The authors acknowledge support by the state of Baden-Württemberg through bwHPC. This work was supported in part by DFG through the grant MA 7807/2-1. Data Availability: The data underlying this article will be shared on reasonable request to the corresponding author.Attached Files
Published - staa2623.pdf
Accepted Version - 2010.08598.pdf
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Additional details
- Eprint ID
- 107061
- Resolver ID
- CaltechAUTHORS:20201214-095337008
- ESA Member States
- NASA
- NNX08AW31G
- NASA
- NNX11A043G
- NASA
- NNX14AQ89G
- NSF
- AST-0808050
- NSF
- AST-1109911
- Baden-Württemberg Stiftung
- Deutsche Forschungsgemeinschaft (DFG)
- MA 7807/2-1
- Created
-
2020-12-14Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Astronomy Department