Europlanet Science Congress 2020
Virtual meeting
21 September – 9 October 2020
Europlanet Science Congress 2020
Virtual meeting
21 September – 9 October 2020
EPSC Abstracts
Vol.14, EPSC2020-603, 2020
https://doi.org/10.5194/epsc2020-603
Europlanet Science Congress 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Fifty AU Study of the chemistry in the disk/envelope system of Solar-like protostars (FAUST) Large program first results: the hot corino in L1551 IRS5

Eleonora Bianchi1, Satoshi Yamamoto2, Cecilia Ceccarelli1, Claire Chandler3, Claudio Codella1,4, Nami Sakai5, and the FAUST Team*
Eleonora Bianchi et al.
  • 1Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
  • 2Department of Physics, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 3National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA
  • 4INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Firenze, Italy
  • 5RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
  • *A full list of authors appears at the end of the abstract

Detection of hot corinos in Solar-like protostars has been so far mostly limited to Class 0 objects, hampering our understanding of their origin and evolution. Recent evidence suggests that planet formation probably starts already in Class I protostars, representing a key step in our understanding of their chemical composition at the planet formation scale. Therefore, understanding the fate of hot corinos in Class I protostars has become of paramount importance. In this context, we report the discovery of a hot corino at the heart of the prototypical Class I source L1551 IRS5, obtained via ALMA observations as part of the Large Program FAUST (Fifty AU Study of the chemistry in the disk/envelope system of Solar-like protostars). More specifically, FAUST is the first ALMA Large Program based on astrochemistry and is designed to survey the chemical composition of a sample of 13 Class 0 and I protostars at the planet-formation scale.

We detected in L1551 IRS 5 several emission lines from interstellar complex organic molecules (iCOMs) such as methanol and its most abundant isotopologues, as well as methyl formate and ethanol.  The line emission is bright toward the north component (N), although a hot corino in the south component, cannot be excluded. The non-LTE analysis of the methanol lines towards N provides constraints on the gas temperature (~ 100 K), density (≥ 1.5 x 108 cm-3) and emitting size (~0.15”, i.e. ~ 10 au in radius). The lines are predicted to be optically thick, the 13CH3OH line having an opacity ≥ 2. The methyl formate and ethanol column densities relative to methanol are ≤ 0.03 and ≤ 0.015, respectively, compatible with those measured in Class 0 sources. Thus, the present observations towards L1551 IRS5 agree with little chemical evolution in hot corinos from Class 0 to I.

 

FAUST Team:

E. Bianchi C. J. Chandler C. Ceccarelli C. Codella N. Sakai A. Lòpez-Sepulcre L. T. Maud G. Moellenbrock B. Svoboda Y. Watanabe T. Sakai F. Ménard Y. Aikawa F. Alves N. Balucani M. Bouvier P. Caselli E. Caux S. Charnley S. Choudhury M. De Simone F. Dulieu A. Durán L. Evans C. Favre D. Fedele S. Feng F. Fontani L. Francis T. Hama T. Hanawa E. Herbst T. Hirota M. Imai A. Isella I. Jiménez-Serra D. Johnstone C. Kahane B. Lefloch L. Loinard M.J. Maureira S. Mercimek A. Miotello S. Mori R. Nakatani H. Nomura Y. Oba S. Ohashi Y. Okoda J. Ospina-Zamudio Y. Oya J. Pineda L. Podio A. Rimola D. Segura Cox Y. Shirley V. Taquet L. Testi C. Vastel S. Viti N. Watanabe A. Witzel C. Xue Y. Zhang B. Zhao and S. Yamamoto

How to cite: Bianchi, E., Yamamoto, S., Ceccarelli, C., Chandler, C., Codella, C., and Sakai, N. and the FAUST Team: Fifty AU Study of the chemistry in the disk/envelope system of Solar-like protostars (FAUST) Large program first results: the hot corino in L1551 IRS5, Europlanet Science Congress 2020, online, 21 September–9 Oct 2020, EPSC2020-603, https://doi.org/10.5194/epsc2020-603, 2020