DEUTERATED MOLECULES IN WARM CARBON CHAIN CHEMISTRY: THE L1527 CASE
DEUTERATED MOLECULES IN WARM CARBON CHAIN CHEMISTRY: THE L1527 CASE
复制标题
DOI：
10.1088/0004-637x/702/2/1025
复制
发表时间：
2009-09-10
影响因子：
4.9
通讯作者：
Yamamoto, Satoshi
中科院分区：
文献类型：
--
作者：
Sakai, Nami;Sakai, Takeshi;Yamamoto, Satoshi
我们对低质量恒星形成区域L1527的各种碳链分子的氘代物种进行了毫米波观测，该区域在原恒星附近显示出异常丰富的碳链分子（暖碳链化学; WCCC）。我们已经探测到1-C3 D，C4D，C4 HD，DC 3 N，DC 5 N和c-C3 HD的光谱线，其中1-C3 D和C4 HD是首次在太空中探测到的。氘分馏率被发现是中等的（2%至7%），虽然他们往往高于那些在无星核心，TMC-1。[CH 2DOH]/[CH 3OH]比率的上限也低至3%。因此，在L1527中没有发现热科里诺源的高氘分馏比。观测到的比值意味着，与热的科里诺相比，L1527中CO在尘埃颗粒上的消耗并没有进行得很远。这将与无星核心阶段的短时间尺度相一致，就像WCCC可能起源的建议一样。
We have conducted millimeter-wave observations of deuterated species of various carbon-chain molecules toward a low-mass star-forming region, L1527, which shows extraordinary richness of carbon-chain molecules in a vicinity of the protostar (Warm Carbon Chain Chemistry; WCCC). We have detected the spectral lines of 1-C3D, C4D, C4HD, DC3N, DC5N, and c-C3HD, where 1-C3D and C4HD are detected for the first time in space. The deuterium fractionation ratios are found to be moderate (2% to 7%), although they tend to be higher than those in the starless core, TMC-1. The upper limit to the [CH2DOH]/[CH3OH] ratio is also as low as 3%. Therefore, high deuterium fractionation ratios reported for hot corino sources are not seen in L1527. The observed ratios mean that the depletion of CO onto dust grains had not proceeded far in L1527, compared to the hot corino case. This would be consistent with a short timescale of the starless core phase, as suggested for the possible origin of WCCC.