VVV-WIT-01：高度模糊的经典新星或原恒星碰撞？
VVV-WIT-01: highly obscured classical nova or protostellar collision?
摘要：
在Via Lactea（VVV）调查中搜索VISTA变量的第一个数据发布，发现异常红色瞬态VVV-WIT-01（$H-K_s=5.2$）。它在2010年3月前达到峰值，然后在接下来的两年里下降了$\sim$ 9.5等。在2010年3月的1.6- 22 $μ$ m光谱能量分布与一个高度模糊的黑体与$T \sim 1000$ K和$A_{K_s} \sim 6.6$ MAG很好地拟合。该源被投射到红外暗云（IRDC）SDC G331.062 $-$ 0.294。对于任何单个事件（$p \approx 0.01$至0.02），机会投影概率都很小，这表明存在物理关联，例如低质量原恒星之间的碰撞。然而，在经典新星（特别是CO新星）中，在光变曲线的红外峰处，$T \sim 1000$ K的黑体发射是常见的，这是由于爆炸后30- 60天尘埃$\sim$的凝结。澳大利亚望远镜紧凑阵列（ATCA）的无线电跟踪探测到一个衰落的连续源，其性质与经典新星一致，但可能与碰撞的原恒星不一致。考虑到所有VVV瞬变可能已经被投射到编目的IRDC，将与$p=0.13$的偶然关联概率提高到0.24。在权衡了几个选项之后，VVV-WIT-01似乎很可能是位于IRDC后面的经典新星事件。
英文摘要：
A search of the first Data Release of the VISTA Variables in the Via Lactea (VVV) Survey discovered the exceptionally red transient VVV-WIT-01 ($H-K_s=5.2$). It peaked before March 2010, then faded by $\sim$9.5 mag over the following two years. The 1.6--22 $μ$m spectral energy distribution in March 2010 was well fit by a highly obscured black body with $T \sim 1000$ K and $A_{K_s} \sim 6.6$ mag. The source is projected against the Infrared Dark Cloud (IRDC) SDC G331.062$-$0.294. The chance projection probability is small for any single event ($p \approx 0.01$ to 0.02) which suggests a physical association, e.g. a collision between low mass protostars. However, black body emission at $T \sim 1000$ K is common in classical novae (especially CO novae) at the infrared peak in the light curve, due to condensation of dust $\sim$30--60 days after the explosion. Radio follow up with the Australia Telescope Compact Array (ATCA) detected a fading continuum source with properties consistent with a classical nova but probably inconsistent with colliding protostars. Considering all VVV transients that could have been projected against a catalogued IRDC raises the probability of a chance association to $p=0.13$ to 0.24. After weighing several options, it appears likely that VVV-WIT-01 was a classical nova event located behind an IRDC.
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