Early Planet Formation in Embedded Disks (eDisk) XIII: Aligned Disks with Non-Settled Dust Around the Newly Resolved Class 0 Protobinary R CrA IRAS 32

• DOI: 10.48550/arxiv.2403.14143
• Publication Date: 2024-03-21
• Authors: Frankie J. Encalada; Leslie W. Looney; Shigehisa Takakuwa; John Tobin; Nagayoshi Ohashi; J. K. Jørgensen; Zhi‐Yun Li; Yuri Aikawa; Yusuke Aso; Patrick M. Koch; Woojin Kwon; S. Lai; Chang Won Lee; Zhe-Yu Daniel Lin; Alejandro Santama...; I. de Gregorio‐Mo...; Nguyễn Thị Phương; Adele Plunkett; Jinshi Sai; Rajeeb Sharma; Hsi-Wei Yen; Ilseung Han
• Keywords: Protoplanetary disks; QB460-466; Earth and Planetary Astrophysics (astro-ph.EP); Astrophysics - Solar and Stellar Astrophysics; Astrophysics of Galaxies (astro-ph.GA); FOS: Physical sciences; Astrophysics; Astrophysics - Astrophysics of Galaxies; Close binary stars; Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics - Earth and Planetary Astrophysics

Young protostellar binary systems, with expected ages less than $\sim$10$^5$ years, are little modified since birth, providing key clues to formation and evolution. We present a first look at the young, Class 0 system R CrA IRAS 32 from Early Planet Formation in Embedded Disks (eDisk) ALMA large program, which observed 1.3 mm continuum emission, $^{12}$CO (2-1), $^{13}$CO C$^{18}$O SO (6$_5$-5$_4$), nine other molecular lines that trace disk, envelope, shocks, outflows. With resolution of $\sim$0.03$^{\prime\prime}$ ($\sim$5 au, distance 150 pc), we characterize newly discovered separation 207 their circumstellar disks, circumbinary disk-like structure. The disk radii 26.9$\pm$0.3 22.8$\pm$0.3 au for sources A B, respectively, dust masses estimated as 22.5$\pm$1.1 12.4$\pm$0.6 M$_{\Earth}$. disks structure have well aligned position angles inclinations, indicating smooth, ordered process such fragmentation. In addition, near/far-side asymmetry emission suggesting has yet settle into thin layer near midplane. Spectral analysis CO isotopologues reveals outflows originate both possibly Furthermore, detect Keplerian rotation toward likely structure; latter suggests it is probably disk.