X-raying the beating heart of a newborn star: Rotational modulation of high-energy radiation from V1647 OriPublication date: 20 Jul 2012 Authors: Hamaguchi, K., et al.
Journal: The Astrophysical Journal Copyright: The American Astronomical Society We report a periodicity of ~1 day in the highly elevated X-ray emission from the protostar V1647 Ori during its two recent multiple-year outbursts of mass accretion. This periodicity is indicative of protostellar rotation at near-break-up speed. Modeling of the phased X-ray light curve indicates that the high-temperature (~50 MK), X-ray-emitting plasma, which is most likely heated by accretion-induced magnetic reconnection, resides in dense ( >~5 × 1010 cm-3), pancake-shaped magnetic footprints where the accretion stream feeds the newborn star. The sustained X-ray periodicity of V1647 Ori demonstrates that such protostellar magnetospheric accretion configurations can be stable over timescales of years.
Last Update: 03 Jul 2012
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