Discovery and observations of ASASSN-13db, an EX lupi-type accretion event on a low-mass T tauri star
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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.
Holoien , T W-S , Prieto , J 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 2014 , ' Discovery and observations of ASASSN-13db, an EX lupi-type accretion event on a low-mass T tauri star ' Astrophysical Journal Letters , vol 785 , no. 2 , L35 . DOI: 10.1088/2041-8205/785/2/L35
Astrophysical Journal Letters
© 2014. The American Astronomical Society. All rights reserved.
J.F.B. is supported by NSF grant PHY-1101216. J.D.S. and J.J.A. are supported by NSF grant AST-1108811.
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