A chemical view of protostellar-disk formation in L1527

Nami Sakai, Yoko Oya, Takeshi Sakai, Yoshimasa Watanabe, Tomoya Hirota, Cecilia Ceccarelli, Claudine Kahane, Ana Lopez-Sepulcre, Bertrand Lefloch, Charlotte Vastel, Sandrine Bottinelli, Emmanuel Caux, Audrey Coutens, Yuri Aikawa, Shigehisa Takakuwa, Nagayoshi Ohashi, Hsi Wei Yen, Satoshi Yamamoto

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


Subarcsecond images of the rotational line emissions of CCH, CS, H 2CO, and CH3OH have been obtained toward the low-mass protostar IRAS 04368+2557 in L1527 as one of the early science projects of the Atacama Large Millimeter/submillimeter Array. The intensity distributions of CCH and CS show a double-peaked structure along the edge-on envelope with a dip toward the protostar position, whereas those of H2CO and CH 3OH are centrally peaked. By analyzing the position-velocity diagrams along the envelope, CCH and CS are found to reside mainly in the envelope, where the gas is infalling with conservation of its angular momentum. They are almost absent inward of the centrifugal barrier (a half of the centrifugal radius). Although H2CO exists in the infalling rotating envelope, it also resides in the disk component inside the centrifugal barrier to some extent. On the other hand, CH3OH seems to exist around the centrifugal barrier and in the disk component. Hence, the drastic chemical change occurs at the centrifugal barrier. A discontinuous infalling motion as well as the gas-grain interaction would be responsible for the chemical change. This result will put an important constraint on initial chemical compositions for chemical evolution of protostellar disks.

Original languageEnglish
Article numberL38
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 2014 Aug 20
Externally publishedYes


  • ISM: abundances
  • ISM: individual objects (L1527)
  • ISM: molecules
  • stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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