The coronae of ultracool dwarfs: Simultaneous X-ray and radio monitoring

Details The coronae of ultracool dwarfs: Simultaneous X-ray and radio monitoring The coronae of ultracool dwarfs: Simultaneous X-ray and radio monitoring

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2327s&link_type=abstract

Chandra Proposal ID #09200198

Physics

Chandra Proposal Id #09200198

Scientific paper

In late-type stars the interaction of stellar magnetic fields with hot plasma trapped within the field lines gives rise to Halpha,X-ray and radio emission, as in the Sun. The coolest stars and brown dwarfs not follow this solar-stellar analogy: their radio emission tends to be overluminous by 3 dex with respect to their X-rays, and there is no clear rotation-activity connection. Possibly the situation in ultracool atmospheres is quite different from those of higher-mass stars, and new emission mechanisms need to be invoked. Since both radio and X-ray emission of these objects are strongly variable, the observational picture remains unclear as long as no simultaneous data is available in both bands. We propose here for joint Chandra/VLA observations of 3 ultracool dwarfs.

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