Erratum: Discovery of a mid-infrared protostellar outburst of exceptional amplitude
Erratum: Discovery of a mid-infrared protostellar outburst of exceptional amplitude
复制标题
勘误表：发现异常振幅的中红外原恒星爆发
DOI：
10.1093/mnras/staa3506
复制
发表时间：
2021
影响因子：
4.8
通讯作者：
Lucas P
中科院分区：
文献类型：
--
作者：
Lucas P
We report the discovery of a mid-infrared outburst in a young stellar object (YSO) with an amplitude close to 8 mag at λ ≈ 4.6 μm. WISEA J142238.82−611553.7 is one of 23 highly variableWide-field Infrared Survey Explorer(WISE) sources discovered in a search of infrared dark clouds (IRDCs). It lies within the small IRDC G313.671−0.309 (d≈2.6 kpc), seen by theHerschel/Hi-Gal survey as a compact massive cloud core that may have been measurably warmed by the event. Pre-outburst data fromSpitzerin 2004 suggest it is a class I YSO, a view supported by observation of weak 2.12 μm H2emission in an otherwise featureless red continuum spectrum in 2019 (6 mag below the peak inKs).Spitzer, WISE, and VISTA Variables in the Via Lactea (VVV) data show that the outburst began by 2006 and has a duration >13 yr, with a fairly flat peak from 2010 to 2014. The low pre-outburst luminosity implies a low-mass progenitor. The outburst luminosity of a few × 102L⊙is consistent with an accretion rateM⊙yr−1, comparable to a classical FU Orionis event. The 4.6 μm peak in 2010 impliesT= 800–1000 K and a disc radial locationR≈ 4.5 au for the emitting region. The colour evolution suggests subsequent progression outwards. The apparent absence of the hotter matter expected in thermal instability or MRI models may be due to complete obscuration of the innermost disc, e.g. by an edge-on disc view. Alternatively, disc fragmentation/infalling fragment models might more naturally explain a mid-infrared peak, though this is not yet clear.
