Discovery and observations of ASASSN-13db, an EX lupi-type accretion event on a low-mass T tauri star

Thomas W. S. Holoien (Lead / Corresponding author), J. L. Prieto, K. Z. Stanek, C. S. Kochanek, B. J. Shappee, Z. Zhu, A. Sicilia-Aguilar, D. Grupe, K. Croxall, David J. Adams, J. D. Simon, Nicholas W. Morrell, S. M. McGraw, R. M. Wagner, Ujani Basu, J. F. Beacom, D. Bersier, J. Brimacombe, J. Jencson, G. PojmanskiS. G. Starrfield, D. M. Szczygie, C. E. Woodward

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34 Citations (Scopus)


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 ?V ~ -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.
Original languageEnglish
Article numberL35
Number of pages6
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 20 Apr 2014


  • Stars: activity Stars: individual (SDSS J051011.01?032826.2) Stars: pre-main sequence


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