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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Astrochemical evolution along star formation: overview of the IRAM Large Program ASAI

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Lefloch, Bertrand [1, 2] ; Bachiller, R. [3] ; Ceccarelli, C. [2] ; Cernicharo, J. [4] ; Codella, C. ; Fuente, A. [3] ; Kahane, C. [5, 2] ; Lopez-Sepulcre, A. [2, 6] ; Tafalla, M. [3] ; Vastel, C. [7] ; Caux, E. [7] ; Gonzalez-Garcia, M. [3, 4] ; Bianchi, E. [5, 8] ; Gomez-Ruiz, A. [5, 9] ; Holdship, J. [10, 2] ; Mendoza, E. [1] ; Ospina-Zamudio, J. ; Podio, L. [5] ; Quenard, D. [10] ; Roueff, E. [11] ; Sakai, N. [12] ; Viti, S. [10] ; Yamamoto, S. [13] ; Yoshida, K. [13] ; Favre, C. [5] ; Monfredini, T. [14] ; Quitian-Lara, H. M. [14] ; Marcelino, N. [4] ; Boechat-Roberty, H. M. [14] ; Cabrit, S. [15]
Total Authors: 30
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[1] Univ Sao Paulo, IAG, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Grenoble Alpes, IPAG, CNRS, F-38000 Grenoble - France
[3] IGN Observ Astron Nacl, Apartado 1143, Alcala De Henares 28800 - Spain
[4] CSIC, ICMM, Grp Mol Astrophys, C Sor Juana La Cruz N3, E-28049 Madrid - Spain
[5] INAF, Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence - Italy
[6] IRAM, 300 Rue Piscine, F-38406 St Martin Dheres - France
[7] Univ Toulouse, UPS OMP, IRAP, F-31028 Toulouse - France
[8] Univ Florence, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino - Italy
[9] CONACYT Inst Nacl Astrofis Opt & Elect, Luis E Erro 1, Puebla 72840 - Mexico
[10] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT - England
[11] Univ PSL, Sorbonne Univ, LERMA, CNRS, Observ Paris, F-92190 Meudon - France
[12] Inst Phys & Chem Res RIKEN, Wako, Saitama 3510198 - Japan
[13] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033 - Japan
[14] Univ Fed Rio de Janeiro, Observ Valongo, BR-20080090 Rio De Janeiro - Brazil
[15] Univ PSL, Sorbonne Univ, Observ Paris, CNRS, LERMA, F-75014 Paris - France
Total Affiliations: 15
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 477, n. 4, p. 4792-4809, JUL 2018.
Web of Science Citations: 23

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 millimetre line surveys between 80 and 272 GHz of a sample of 10 template sources, which fully cover the first stages of the formation process of solar-type stars, from pre-stellar cores to the late protostellar phase. In this paper, 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. (AU)

FAPESP's process: 15/22254-0 - Preparing for LLAMA: astrochemistry of star forming regions i. on the origin of C-chain molecules and deuteration around protostars
Grantee:Edgar Fabián Mendoza Rodríguez
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/22095-6 - ACHEMOS: astrochemistry of our origins, a comprehensive study of the prebiotic chemistry in pre-stellar regions
Grantee:Edgar Fabián Mendoza Rodríguez
Support type: Scholarships in Brazil - Post-Doctorate