Comet SW3 and XMM-Newton: an extremely close encounter with a flying laboratory

Astronomy and Astrophysics – Astrophysics

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Stars, White Dwarfs, Solar System, Comet 73P-C/Sw3, Xmm-Newton Proposal 04069501

Scientific paper

Collisions between stellar winds and their gaseous environments play an important role in many areas of astrophysics. We propose to utilize XMM-Newton to study the X-ray aurora produced by the collision of the solar wind with the neutral coma around the largest remaining fragment of comet SW3. Its extremely close encounter in May 2006 provides the opportunity to spatially resolve the deceleration and depletion of the solar wind ions in the coma. In combination with laboratory atomic data, this provides a quantitative handle on the conditions throughout the interaction zone, which will greatly improve our understanding of the interaction of the solar wind with solar system objects and in more general, of physical processes in wind-environment collisions.

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