Astrochemical evolution along star formation: Overview of the IRAM Large Program ASAI.
Astrochemical evolution along star formation: Overview of the IRAM Large Program ASAI.
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恒星形成过程中的天体化学演化：IRAM 大型计划 ASAI 概述。
DOI：
10.1093/mnras/sty937
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发表时间：
2018-04-14
影响因子：
4.8
通讯作者：
Cabrit S
中科院分区：
文献类型：
--
作者：
Lefloch B;Bachiller R;Ceccarelli C;Cernicharo J;Codella C;Fuente A;Kahane C;López-Sepulcre A;Tafalla M;Vastel C;Caux E;González-García M;Bianchi E;Gómez-Ruiz A;Holdship J;Mendoza E;Ospina-Zamudio J;Podio L;Quénard D;Roueff E;Sakai N;Viti S;Yamamoto S;Yoshida K;Favre C;Monfredini T;Quitián-Lara HM;Marcelino N;Boechat-Roberty HM;Cabrit S
越来越多的证据表明，我们太阳系的小天体，如彗星和小行星，至少部分继承了太阳系形成的第一阶段的化学成分。然后，这些小天体的分子复杂性很可能与恒星形成的最早阶段有关。因此，重要的是要刻画和了解化学演化如何随着太阳类型的原恒星演化而变化。我们在此介绍大型项目“IRAM天体化学调查”(ASAI)。其目标是在80至272 GHz范围内对10个模板源样本进行无偏毫米线测量，完全覆盖太阳型恒星形成过程的第一阶段，从恒星前核心到晚期原恒星阶段。在这篇文章中，我们概述了从3毫米波段观测获得的调查和分析结果。探测到的主要同位素物种的数量几乎不随演化阶段而变化，并被发现与大质量恒星形成区的数量非常相似。含氧和含碳物种中的分子含量使我们可以定义两种化学类型的包络，其组成由a)与热Corino源有关的富含O的复杂有机分子中的丰富含量，或b)碳氢化合物中的丰富含量，典型的热碳链化学源。总体而言，在太阳型恒星形成的初始阶段，已经发现了高度的化学丰度。
Evidence is mounting that the small bodies of our Solar System, such as comets and asteroids, have at least partially inherited their chemical composition from the first phases of the Solar System formation. It then appears that the molecular complexity of these small bodies is most likely related to the earliest stages of star formation. It is therefore important to characterize and to understand how the chemical evolution changes with solar-type protostellar evolution. We present here the Large Program ”Astrochemical Surveys At IRAM” (ASAI). Its goal is to carry out unbiased millimeter line surveys between 80 and 272 GHz of a sample of ten template sources, which fully cover the first stages of the formation process of solar-type stars, from prestellar cores to the late protostellar phase. In this article, we present an overview of the surveys and results obtained from the analysis of the 3 mm band observations. The number of detected main isotopic species barely varies with the evolutionary stage and is found to be very similar to that of massive star-forming regions. The molecular content in O- and C- bearing species allows us to define two chemical classes of envelopes, whose composition is dominated by either a) a rich content in O-rich complex organic molecules, associated with hot corino sources, or b) a rich content in hydrocarbons, typical of Warm Carbon Chain Chemistry sources. Overall, a high chemical richness is found to be present already in the initial phases of solar-type star formation.
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影响因子：
7.9
作者：
Arce, Hector G.;Santiago-Garcia, Joaquin;Bachiller, Rafael
通讯作者：
Bachiller, Rafael
影响因子：
4.9
作者：
Bachiller, R;Gutierrez, MP
通讯作者：
Gutierrez, MP
影响因子：
4.8
作者：
Bianchi, E.;Codella, C.;Taquet, V.
通讯作者：
Taquet, V.
影响因子：
6.5
作者：
Bottinelli, S.;Ceccarelli, C.;Lefloch, B.
通讯作者：
Lefloch, B.
影响因子：
6.5
作者：
Al-Edhari, A. Jaber;Ceccarelli, C.;Wiesenfeld, L.
通讯作者：
Wiesenfeld, L.