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

TY - JOUR

T1 - Discovery and observations of ASASSN-13db, an EX lupi-type accretion event on a low-mass T tauri star

AU - Holoien, Thomas W. S.

AU - Prieto, J. L.

AU - Stanek, K. Z.

AU - Kochanek, C. S.

AU - Shappee, B. J.

AU - Zhu, Z.

AU - Sicilia-Aguilar, A.

AU - Grupe, D.

AU - Croxall, K.

AU - Adams, J. J.

AU - Simon, J. D.

AU - Morrell, Nicholas W.

AU - McGraw, S. M.

AU - Wagner, R. M.

AU - Basu, Ujani

AU - Beacom, J. F.

AU - Bersier, D.

AU - Brimacombe, J.

AU - Jencson, J.

AU - Pojmanski, G.

AU - Starrfield, S. G.

AU - Szczygie, D. M.

AU - Woodward, C. E.

N1 - J.F.B. is supported by NSF grant PHY-1101216. J.D.S. and J.J.A. are supported by NSF grant AST-1108811. 10.1088/2041-8205/785/2/L35 Article 2041-8205 L35

PY - 2014/4/20

Y1 - 2014/4/20

N2 - 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.

AB - 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.

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

U2 - 10.1088/2041-8205/785/2/L35

DO - 10.1088/2041-8205/785/2/L35

M3 - Article

SN - 2041-8205

VL - 785

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L35

ER -