OPTICAL TiO AND VO BAND EMISSION IN TWO EMBEDDED PROTOSTARS: IRAS 04369+2539 AND IRAS 05451+0037
OPTICAL TiO AND VO BAND EMISSION IN TWO EMBEDDED PROTOSTARS: IRAS 04369+2539 AND IRAS 05451+0037
复制标题
两个嵌入式原恒星中的光学 TiO 和 VO 波段发射：IRAS 04369 2539 和 IRAS 05451 0037
DOI：
10.1088/0004-6256/143/2/37
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
P. McGehee
中科院分区：
文献类型：
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作者：
L. Hillenbrand;G. Knapp;D. Padgett;L. Rebull;P. McGehee
来自斯隆数字巡天的两颗光学上微弱的平光谱原恒星IRAS 04369+2539和IRAS 05451+0037的档案光谱显示出强烈的发射在线特征，包括TiO和VO的几个分子带的清晰和广泛的发射。分子发射表明了密集、温暖的星周气体，以前只在一个物体上看到过：在强烈的光学爆发（PTF 10nvg）期间，平光谱原恒星IRAS 20496+4354。在另外两个具有类似中红外特性（但不知道正在经历爆发）的物体中存在广泛的分子发射特征，可以为原行星盘早期阶段的快速吸积/流出阶段提供新的见解。目前，观测到的TiO/VO冷却发射的相关几何结构和形成或加热机制仍未得到解释。
Archival spectra from the Sloan Digital Sky Survey of two optically faint flat-spectrum protostars, IRAS 04369+2539 and IRAS 05451+0037, show strong emission-line features including—notably—clear and broad emission across several molecular bands of TiO and VO. The molecular emission is indicative of dense, warm circumstellar gas and has been seen previously in only one object: the flat-spectrum protostar IRAS 20496+4354 during a strong optical outburst (PTF 10nvg). The presence of broad molecular emission features in two additional objects having similar mid-infrared properties (but not known to be undergoing outbursts) could provide new insight into phases of rapid accretion/outflow at early stages of the protoplanetary disk. At present, the relevant geometry and the formation or heating mechanisms responsible for the observed TiO/VO cooling emission remain unexplained.