Early Planet Formation in Embedded Disks (eDisk). IX. High-resolution ALMA Observations of the Class 0 Protostar R CrA IRS5N and Its Surroundings

• DOI: 10.3847/1538-4357/ace35c
• Publication Date: 2023-08-23T16:06:38Z
• Authors: Rajeeb Sharma; Jes K. Jørgensen; Sacha Gavino; Nagayoshi Ohashi; John J. Tobin; Zhe-Yu Daniel Lin; Zhi-Yun Li; Shigehisa Takakuwa; Chang Won Lee; Jinshi Sai (Insa ...; Woojin Kwon; Itziar de Gregori...; Alejandro Santama...; Hsi-Wei Yen; Yuri Aikawa; Yusuke Aso; Shih-Ping Lai; Jeong-Eun Lee; Leslie W. Looney; Nguyen Thi Phuong; Travis J. Thieme; Jonathan P. Williams
• Keywords: Protostar; Outflow; Bipolar outflow; Circumstellar disk; Submillimeter Array

We present high-resolution, high-sensitivity observations of the Class 0 protostar RCrA IRS5N as part Atacama Large Milimeter/submilimeter Array (ALMA) large program Early Planet Formation in Embedded Disks (eDisk). The 1.3 mm continuum emission reveals a flattened structure around IRS5N, consistent with protostellar disk early phases evolution. appears smooth and shows no substructures. However, brightness asymmetry is observed along minor axis disk, suggesting optically geometrically thick. estimate mass to be between 0.007 0.02 M$_{\odot}$. Furthermore, molecular has been detected from various species, including C$^{18}$O (2$-$1), $^{12}$CO $^{13}$CO H$_2$CO (3$_{0,3}-2_{0,2}$, 3$_{2,1}-2_{2,0}$, 3$_{2,2}-2_{2,1}$). By conducting position-velocity analysis (2$-$1) emission, we find that exhibits characteristics Keplerian rotation central approximately 0.3 Additionally, observe dust nearby binary source, IRS5a/b. toward IRS5a/b seems emanate IRS5b flow into IRS5a, material transport their mutual orbits. lack outflow large-scale negatives \tlvco~observed suggests much flux being resolved out. Due this substantial surrounding envelope, expected significantly more massive future.