Accretion as a function of Orbital Phase in Young Close Binaries

Type Conference Paper
Names David R. Ardila, G. Herczeg, C. M. Johns-Krull, R. D. Mathieu, A. Vodniza, B. M. Tofflemire
Proceedings Title American Astronomical Society
Conference Name AAS Meeting #223, #424.07
Date January 1, 2014
URL http://adsabs.org/2014AAS.22342407A
Library Catalog labs.adsabs.harvard.edu
Abstract Many planets are known to reside around binaries and the study of young binary systems is crucial to understand their formation. Young ($<10$ Myrs) low-mass binaries are generally surrounded by circumbinary disk with an inner gap. Gas from the disk must cross this gap for accretion to take place and here we present observations of this process as a function of orbital phase. We have obtained time-resolved FUV and NUV spectroscopy (1350 to 3000 A) of DQ Tau and UZ Tau E, using the Cosmic Origins Spectrograph on-board the Hubble Space Telescope. Each target was observed 2 to 4 times per binary orbit, over three or four consecutive orbits. For DQ Tau, we find some evidence that accretion occurs equally into both binary members, while for UZ Tau E this is not the case. H2 emission for DQ Tau most likely originates within the circumbinary gap, while for UZ Tau E no 1000 K gas is detected within the gap, although magnetospheric accretion does take place.
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