Other
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..23j&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 23-23"
Other
Scientific paper
We have used high-resolution optical spectra from the ESO Very Large Telescope and Magellan to monitor several young brown dwarfs. We find significant variability in H-alpha and a number of other emission lines related to accretion and outflow processes on a variety of timescales ranging from hours to weeks to years. The most dramatic changes are seen for 2MASS J1207334-393254 (2M 1207), 2MASS J11013205-7718249 (2M 1101), and Cha I-ISO 217. We observe possible accretion rate changes by about an order of magnitude in two of these objects, over timescales of weeks (2M 1207) or hours (2M 1101). The accretion “burst”' seen in 2M 1101 could be due to a “clumpy” flow. We also see indications for changes in the outflow rate in at least three objects. In one case (ISO 217), there appears to be a ~1 hr time lag between outflow and accretion variations, consistent with a picture in which the wind forms at the inner disk edge. Our findings strongly suggest that the magnetospheric accretion scenario for T Tauri stars extends well into the sub-stellar regime, and that accretion/outflow phenomena are highly time variable.
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