论文标题
首次检测CHD $ _ {2} $ oh to pre-Stellar核心
First detection of CHD$_{2}$OH towards pre-stellar cores
论文作者
论文摘要
在恒星和行星形成过程中材料的遗传是通过氘分馏所追踪的。我们在这里报告了第一次发现对固有核心的双脱脂甲醇的发现。我们研究甲醇的氘分馏，ch $ _ {3} $ OH，朝两个无星和两个前核心。我们的D/h比为0.8-1.9 $ \％$，ch $ _ {2} $ doh在固有前核H-MM1和L694-2中的D/h比率与更具进化的0/I对物体和Comet 67p/Churyumov-Gerasimenko的测量相一致，这是一个直接的化学链接，这是一个直接的化学链接。 Furthermore, the column density ratios of CHD$_{2}$OH/CH$_{2}$DOH are $\sim$50-80$\%$, consistently high as that towards Class 0/I objects, indicating an efficient formation mechanism of CHD$_{2}$OH, possibly through H atom additions to D$_{2}$CO. Ch $ _ {2} $ doh/ch $ _ {3} $ oh和Chd $ _ {2} $ oh/ch $ _ {3} $ oh圆柱密度比在两个前的核心中大于两个无星核B68和L1521E中的ch $ _ {2} $ _ {2} $ oh/chd $ _ {2} $ oh/chd $ _ {2} $ oh/chd $ _ {2} $ oh/chd $ _ {2} $ oh/chd $ _ {2} $ oh/chd $ _ {2}。
The inheritance of material across the star and planet formation process is traced by deuterium fractionation. We report here the first detection of doubly deuterated methanol towards pre-stellar cores. We study the deuterium fractionation of methanol, CH$_{3}$OH, towards two starless and two pre-stellar cores. We derive a D/H ratio of 0.8-1.9$\%$ with CH$_{2}$DOH in pre-stellar cores H-MM1 and L694-2, consistent with measurements in more evolved Class 0/I objects and comet 67P/Churyumov-Gerasimenko, suggesting a direct chemical link arising in the pre-stellar stage. Furthermore, the column density ratios of CHD$_{2}$OH/CH$_{2}$DOH are $\sim$50-80$\%$, consistently high as that towards Class 0/I objects, indicating an efficient formation mechanism of CHD$_{2}$OH, possibly through H atom additions to D$_{2}$CO. The CH$_{2}$DOH/CH$_{3}$OH and CHD$_{2}$OH/CH$_{3}$OH column density ratios in the two pre-stellar cores are larger than that in the two starless cores B68 and L1521E, representing an evolutionary trend of methanol deuteration in early-stage cores.
