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The 2008 Extreme Outburst of the Young Eruptive Variable Star EX Lupi

Aspin, Colin and Reipurth, Bo and Herczeg, Gregory J. and Capak, Peter (2010) The 2008 Extreme Outburst of the Young Eruptive Variable Star EX Lupi. Astrophysical Journal Letters, 719 (1). L50-L55. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20100831-133312246

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Abstract

In early 2008, the young low-mass star EX Lupi, the prototype of the EXor class of eruptive variables, optically brightened by over 5 mag for a period of seven months. The previous time a change of such amplitude had been observed in EX Lup was over 50 years ago. In this Letter, we present new optical and near-IR high-resolution spectroscopy of EX Lup during the 2008 outburst. We investigate the physical characteristics of the outburst both soon after it began and some four months later, and consider the observed energetics and kinematics. Emission line strengths, widths, and profiles significantly changed between the two observations. Also, modeling of the 2.2935 μm CO overtone band head emission suggests that an inner gap in the circumstellar gas disk around the star may be present and that it is from the inner edge of the gas disk that the CO overtone emission probably arises. We derive a mass accretion luminosity and rate during the extreme outburst of ~2 ± 0.5 L_⊙ and ~(2 ± 0.5) × 10^(–7) M_⊙ yr^(–1), respectively, which suggests that this outburst was indeed one of the strongest witnessed in EX Lup, yet not as strong as those observed in FU Orionis stars.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/2041-8205/719/1/L50 DOIUNSPECIFIED
http://iopscience.iop.org/2041-8205/719/1/L50/PublisherUNSPECIFIED
Additional Information:© 2010 The American Astronomical Society. Received 2010 March 13; accepted 2010 June 28; published 2010 July 22. We warmly thank G.H. Herbig for providing access to the J23 HIRES data on EX Lupi. We are indebted to A. Jones for alerting us (via G.H. Herbig) to this new outburst of EX Lup. We also thank A. Juhasz for providing the K-band magnitude used above. Data were obtained at the W.M. Keck Observatory, operated as a scientific partnership by the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. B.R. acknowledges partial support from the NASA Astrobiology Institute (Cooperative Agreement No. NNA04CC08A).
Group:COSMOS
Funders:
Funding AgencyGrant Number
NASA Astrobiology Institute NNA04CC08A
Subject Keywords:circumstellar matter; stars: formation; stars: individual (EX Lupi)
Classification Code:PACS: 97.21.+a; 95.85.Jq; 97.10.Gz; 95.85.Kr; 97.10.Ri; 97.30.Sw
Record Number:CaltechAUTHORS:20100831-133312246
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100831-133312246
Official Citation:Colin Aspin et al 2010 ApJ 719 L50 doi: 10.1088/2041-8205/719/1/L50
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19745
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Sep 2010 19:10
Last Modified:06 Jul 2015 20:31

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