CTTS Excess Emission from 0.8 to 2.4 Microns
First Author:
William Fischer
Email: wjfischer AT gmail.com
University of Toledo
Department of Physics and Astronomy, MS 111, The University of Toledo, 2801 West Bancroft Street
Toledo, OH, 43606, US
Coauthors:
Edwards, Suzan, Smith College
Hillenbrand, Lynne, Caltech
Kwan, John, University of Massachusetts
Abstract
We present the first-ever CTTS excess emission SEDs between 0.8 and 2.4 microns. With SpeX on the IRTF, we obtained medium-resolution (R=2000) spectra of 16 CTTS spanning a broad range of mass accretion rates. Here we present the excess SEDs of a 7-star subsample with spectral types of K7/M0 for which the WTTS V819 Tau is a suitable template. We find more emission than expected from the sum of the accretion-heated photosphere that dominates shortward of 0.5 microns and warm dust from the dust sublimation radius in the inner disk that dominates beyond 2.2 microns, consistent with our earlier finding that the 1-micron veiling exceeds the contributions from these 2 sources. Accounting for this emission may require modification of the magnetospheric accretion scenario and revision of accretion luminosities in CTTS.
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