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

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

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


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.

Original languageEnglish (US)
Article numberL35
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Apr 20 2014


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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