Year: 2026
Type: article
Abstract: We report the Atacama Large Millimeter/submillimeter Array observations of 1.3 mm continuum, C 18 O ( J = 2−1), and N 2 D + ( J = 3−2) toward the millimeter multisystem MMS 2 in the Orion molecular cloud 3 region at an angular resolution of 1 . ″ 59 (∼620 au). MMS 2 is in the flat-spectrum phase, with its protostars in the late stage of the main accretion phase. We detect the centrally condensed structures traced by C 18 O emission associated with the 1.3 mm continuum sources MMS 2-North and MMS 2-South, which are spatially resolved and unresolved, respectively. The estimated diameter and mass of the centrally condensed structure associated with MMS 2-North are 1 . ″ 64 (∼640 au) and 3.0 × 10 −4 M ⊙ , respectively. We also detect an extended structure traced by C 18 O emission associated with the circumbinary envelope at a scale of 5 . ″ 70 (∼2240 au) with an estimated gas mass of 1.4 × 10 −2 M ⊙ . In addition, we detect a filamentary structure traced by N 2 D + emission to the south of MMS 2, which is spatially offset from the C 18 O emission. This offset may be attributed to the influence of the warm surrounding environment.
Source: The Astrophysical Journal
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, Natural Science Foundation of Shanghai, National Radio Astronomy Observatory, National Natural Science Foundation of China, Chinese Academy of Sciences, Korea Astronomy and Space Science Institute, National Astronomical Observatory of Japan, National Institutes of Natural Sciences
OpenAlex ID: W7212325903