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The inner disks of EXor-type eruptive stars

Published online by Cambridge University Press:  06 January 2014

Nikoletta Sipos  and
Ágnes Kóspál
Nikoletta Sipos
Affiliation:
Institute for Astronomy, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zurich, Switzerland email: niki@phys.ethz.ch
Ágnes Kóspál
Affiliation:
Research and Scientific Support Department, European Space Agency (ESA, ESTEC, SRE-SA), PO Box 299, 2200 AG, Noordwijk, The Netherlands, email: akospal@rssd.esa.int
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Abstract

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EX Lupi-type young stars (EXors) show sporadic brightenings of several magnitudes, caused by the episodic increase in the accretion rate of the circumstellar matter onto the young star. As the inner disk plays a crucial role during the onset of the outburst, we examined the quiescent properties of the circumstellar environment of EXors, focusing on the inner regions. We found that in case of three EXors (VY Tau, V1143 Ori and EX Lup) the spectral energy distributions show no or weak excess above the stellar photosphere at NIR-MIR wavelengths, indicative of inner disk clearing. A detailed radiative transfer modeling of the sources revealed that the inner regions of these disks had to go through significant evolution, either the inner radius of the dusty disk is beyond the sublimation radius and/or the inner disks are flattened.

Keywords

stars: formation – stars: protoplanetary disks – stars: individual: VY TauV1143 OriEX Lup
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 121 - 122
Copyright
Copyright © International Astronomical Union 2013 

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