ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster

Yusuke Aso, Nagayoshi Ohashi, Yuri Aikawa, Masahiro N. Machida, Kazuya Saigo, Masao Saito, Shigehisa Takakuwa, Kengo Tomida, Kohji Tomisaka, Hsi Wei Yen, Jonathan P. Williams

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We report the discovery of an extremely young protostar, SMM11, located in the associated submillimeter condensation in the Serpens Main cluster using the Atacama Large Millimeter/submillimeter Array (ALMA) during its Cycle 3 at 1.3 mm and an angular resolution of . SMM11 is a Class 0 protostar without any counterpart at 70 μm or shorter wavelengths. The ALMA observations show 1.3 mm continuum emission associated with a collimated 12CO bipolar outflow. Spitzer and Herschel data show that SMM11 is extremely cold ( 26 K) and faint ( 0.9 ). We estimate the inclination angle of the outflow to be , almost parallel to the plane of the sky, from simple fitting using a wind-driven-shell model. The continuum visibilities consist of Gaussian and power-law components, suggesting a spherical envelope with a radius of ∼600 au around the protostar. The estimated low C18O abundance, X(C18O) = 1.5-3 , is also consistent with its youth. The high outflow velocity, a few 10 at a few 1000 au, is much higher than theoretical simulations of first hydrostatic cores, and we suggest that SMM11 is a transitional object right after the second collapse of the first core.

元の言語英語
記事番号L2
ジャーナルAstrophysical Journal Letters
850
発行部数1
DOI
出版物ステータス出版済み - 11 20 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Aso, Y., Ohashi, N., Aikawa, Y., Machida, M. N., Saigo, K., Saito, M., Takakuwa, S., Tomida, K., Tomisaka, K., Yen, H. W., & Williams, J. P. (2017). ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster. Astrophysical Journal Letters, 850(1), [L2]. https://doi.org/10.3847/2041-8213/aa9701