Decrease of the organic deuteration during the evolution of Sun-like protostars: the case of SVS13-A
Decrease of the organic deuteration during the evolution of Sun-like protostars: the case of SVS13-A
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DOI：
10.1093/mnras/stx252
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发表时间：
2017-06-01
影响因子：
4.8
通讯作者：
Taquet, V.
中科院分区：
文献类型：
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作者：
Bianchi, E.;Codella, C.;Taquet, V.
我们提出的结果，甲醛和甲醇氘代测量对I类低质量原恒星SVS 13-A的IRAM 30米ASAI（天体化学调查在IRAM）项目的框架。在276 K以下，我们探测到了甲醛、甲醇及其氘代产物（HDCO、D_2CO、CHD_2OH、CH_3OD）的发射谱线。甲醛分析表明T-kin近似于15-30 K，H-n（2）>= 10（6）cm（-3），大小约为1200 Au，表明起源于原恒星包层。对于甲醇，我们发现了两种组分：（i）来自热科里诺（半径类似或等于35 Au）的高温（T-kin类似于80 K）和非常致密（> 10（8）cm（-3））的气体，以及（ii）较冷的（T-kin
We present the results of formaldehyde and methanol deuteration measurements towards the Class I low-mass protostar SVS13-A in the framework of the IRAM 30-m ASAI (Astrochemical Surveys at IRAM) project. We detected emission lines of formaldehyde, methanol and their deuterated forms (HDCO, D2CO, CHD2OH, CH3OD) with Eup up to 276 K. The formaldehyde analysis indicates T-kin similar to 15-30 K, H-n(2) >= 10(6) cm(-3) and a size of about 1200 au suggesting an origin in the protostellar envelope. For methanol, we find two components: (i) a high temperature (T-kin similar to 80 K) and very dense (> 10(8) cm(-3)) gas from a hot corino ( radius similar or equal to 35 au), and (ii) a colder (T-kin