Abstract
Abstract
One of the most poorly understood aspects of low-mass star formation is how multiple-star systems are formed. Here we present the results of Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations toward a forming quadruple protostellar system, G206.93-16.61E2, in the Orion B molecular cloud. ALMA 1.3 mm continuum emission reveals four compact objects, of which two are Class I young stellar objects and the other two are likely in prestellar phase. The 1.3 mm continuum emission also shows three asymmetric ribbon-like structures that are connected to the four objects, with lengths ranging from ∼500 to ∼2200 au. By comparing our data with magnetohydrodynamic simulations, we suggest that these ribbons trace accretion flows and also function as gas bridges connecting the member protostars. Additionally, ALMA CO J = 2−1 line emission reveals a complicated molecular outflow associated with G206.93-16.61E2, with arc-like structures suggestive of an outflow cavity viewed pole-on.
Funder
National Key Research and Development Program of China Stem Cell and Translational Research
MOST ∣ National Natural Science Foundation of China
International partnership program of Chinese Academy of Sciences
Shanghai Pujiang Program
NSF
National Aeronautics and Space Administration
MOST ∣ NSFC ∣ Young Scientists Fund
CPSF
KAKENHI
Academy of Finland
ANID BASAL
UK Science and Technology Facilities Council
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics