VVV-WIT-01: highly obscured classical nova or protostellar collision?

VVV-WIT-01: highly obscured classical nova or protostellar collision?
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VVV-WIT-01:高度模糊的经典新星或原恒星碰撞?

DOI:
10.1093/mnras/staa155
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发表时间:
2020
影响因子:
4.8
通讯作者:
Smith, L C
Smith, L C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lucas, P W;Minniti, D;Kamble, A;Kaplan, D L;Cross, N;Dekany, I;Ivanov, V D;Kurtev, R;Saito, R K;Smith, L C

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对 Via Lactea (VVV) 调查中 VISTA 变量的第一个数据发布的搜索发现了异常红色的瞬变 VVV-WIT-01 (H−Ks= 5.2)。它在 2010 年 3 月之前达到顶峰,然后在接下来的 2 年内减弱了~9.5 星等。 2010 年 3 月的 1.6–22μm 光谱能量分布与 T∼ 1000 K 和 Mag 的高度模糊的黑体非常吻合。光源相对于红外暗云 (IRDC) SDC G331.062−0.294 进行投影。对于任何单个事件,机会投影概率都很小 (p≈ 0.01–0.02),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(尤其是 CO 新星)中,由于爆炸后约 30-60 天的尘埃凝结,在光曲线的红外峰值处,T∼1000K 的黑体发射很常见。澳大利亚望远镜紧凑阵列的无线电跟踪检测到一个衰落的连续谱源,其特性与经典新星一致,但可能与碰撞的原恒星不一致。考虑到所有可能针对编目 IRDC 进行预测的 VVV 瞬变,提高了机会关联 top= 0.13–0.24 的概率。在权衡了多种选择后,VVV-WIT-01 似乎是位于 IRDC 后面的经典新星事件。
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−Ks= 5.2). It peaked before March 2010, then faded by ∼9.5 mag over the following 2 yr. The 1.6–22μm spectral energy distribution in March 2010 was well fit by a highly obscured blackbody withT∼ 1000 K andmag. 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≈ 0.01–0.02), which suggests a physical association, e.g. a collision between low mass protostars. However, blackbody emission atT∼ 1000 K is common in classical novae (especially CO novae) at the infrared peak in the light curve due to condensation of dust ∼30–60 d after the explosion. Radio follow-up with the Australia Telescope Compact Array 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 top= 0.13–0.24. After weighing several options, it appears likely that VVV-WIT-01 was a classical nova event located behind an IRDC.
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