An origin of arc structures deeply embedded in dense molecular cloud cores

Tomoaki Matsumoto, Toshikazu Onishi, Kazuki Tokuda, Shu ichiro Inutsuka

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


We investigated the formation of arc-like structures in the infalling envelope around protostars, motivated by the recent Atacama Large Millimeter/Submillimeter Array (ALMA)observations of the high-density molecular cloud core, MC27/L1521F. We performed self-gravitational hydrodynamical numerical simulations with an adaptive mesh refinement code. A filamentary cloud with a 0.1 pc width fragments into cloud cores because of perturbations due to weak turbulence. The cloud core undergoes gravitational collapse to form multiple protostars, and gravitational torque from the orbiting protostars produces arc structures extending up to a 1000 au scale. As well as on a spatial extent, the velocity ranges of the arc structures, ~0.5 kms-1, are in agreement with the ALMA observations. We also found that circumstellar discs are often misaligned in triple system. The misalignment is caused by the tidal interaction between the protostars when they undergo close encounters because of a highly eccentric orbit of the tight binary pair.

Original languageEnglish
Pages (from-to)L123-L127
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Publication statusPublished - Feb 18 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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