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Published February 16, 2009 | Published
Book Section - Chapter Open

Measuring tiny mass accretion rates onto young brown dwarfs


We present low-resolution Keck I/LRIS-ADC spectra spanning from 3200–9000 Å of six young brown dwarfs in the TW Hya Association and in Upper Sco. The optical spectral types of the sample range from M7.25–M8.75, though two have near-IR spectral types of early L-dwarfs. For four brown dwarfs in our sample, the accretion luminosity is measurable only when the image is binned over large wavelength intervals. This method extends our sensivity to accretion rate down to ~10^(−13) M_☉ yr^(−1) for brown dwarfs.

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© 2009 American Institute of Physics. Issue Date: 16 February 2009. The data were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation.

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Published - Herczeg2009p8347Cool_Stars_Stellar_Systems_And_The_Sun.pdf


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