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

  • Aso Y
  • Ohashi N
  • Aikawa Y
  • et al.
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Abstract

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 μ m or shorter wavelengths. The ALMA observations show 1.3 mm continuum emission associated with a collimated 12 CO 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 C 18 O abundance, X (C 18 O) = 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.

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Aso, Y., Ohashi, N., Aikawa, Y., Machida, M. N., Saigo, K., Saito, M., … Williams, J. P. (2017). ALMA Observations of SMM11 Reveal an Extremely Young Protostar in Serpens Main Cluster. The Astrophysical Journal Letters, 850(1), L2. https://doi.org/10.3847/2041-8213/aa9701

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