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X-Ray Flares and Outflows Driven by Magnetic Interaction Between a Protostar and its Surrounding Disk

Published online by Cambridge University Press:  12 April 2016

Mitsuru Hayashi ,
Kazunari Shibata  and
Ryoji Matsumoto
Mitsuru Hayashi
Affiliation:
Department of Physics, Graduate School of Science and Technology, Chiba University, Inage-Ku, Chiba 263, Japan
Kazunari Shibata
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181, Japan
Ryoji Matsumoto
Affiliation:
Department of Physics, Faculty of Science, Chiba University, Inage-Ku, Chiba 263, Japan & Advanced Science Research Center, JAERI, Naka, Japan

Abstract

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Here we present a model of hard X-ray flares and hot plasma outflows (optical jets) observed in protostars. Assuming that the dipole magnetic field of a protostar threads the protostellar disk, we carried out 2.5-dimensional magnetohydrodynamic (MHD) simulations of the diskstar interaction. The closed magnetic loops connecting the central star and the disk are twisted by the rotation of the disk. In the presence of resistivity, magnetic reconnection takes place in the current sheet formed inside the expanding loops. Hot, outgoing plasmoid and post flare loops are formed as a result of the reconnection. Numerical results are consistent with the observed plasma temperature (107 – 108K), the length of the flaring loop (1011 – 1012cm), and the speed of optical jets (200 – 400 km s−1 ).

Type
Part 15. Poster Papers
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 717 - 718
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

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