Discovery and Observations of ASASSN-13db, an EX Lupi-type Accretion Event on a Low-mass T Tauri Star

April 2014 • 2014ApJ...785L..35H

Authors • Holoien, Thomas W. -S. • Prieto, Jose L. • Stanek, K. Z. • Kochanek, C. S. • Shappee, B. J. • Zhu, Z. • Sicilia-Aguilar, A. • Grupe, D. • Croxall, K. • Adams, J. J. • Simon, J. D. • Morrell, N. • McGraw, S. M. • Wagner, R. M. • Basu, U. • Beacom, J. F. • Bersier, D. • Brimacombe, J. • Jencson, J. • Pojmanski, G. • Starrfield, S. G. • Szczygieł, D. M. • Woodward, C. E.

Abstract • We discuss ASASSN-13db, an EX Lupi-type ("EXor") accretion event on the young stellar object (YSO) SDSS J051011.01-032826.2 (hereafter SDSSJ0510) discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). Using archival photometric data of SDSSJ0510 we construct a pre-outburst spectral energy distribution and find that it is consistent with a low-mass class II YSO near the Orion star forming region (d ~ 420 pc). We present follow-up photometric and spectroscopic observations of the source after the ΔV ~ -5.4 mag outburst that began in 2013 September and ended in early 2014. These data indicate an increase in temperature and luminosity consistent with an accretion rate of ~10^-7 M _⊙ yr^-1, three or more orders of magnitude greater than in quiescence. Spectroscopic observations show a forest of narrow emission lines dominated by neutral metallic lines from Fe I and some low-ionization lines. The properties of ASASSN-13db are similar to those of the EXor prototype EX Lupi during its strongest observed outburst in late 2008.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2014ApJ...785L..35H
• PDF https://stacks.iop.org/2041-8205/785/L35/pdf
• PREPRINT http://arxiv.org/abs/1401.3335
• DATA https://irsa.ipac.caltech.edu/bibdata/2014/H/2014ApJ...785L..35H.html
• ELECTR https://doi.org/10.1088%2F2041-8205%2F785%2F2%2FL35