{
  "id": "2403.14143",
  "version": "v1",
  "published": "2024-03-21T05:39:58.000Z",
  "updated": "2024-03-21T05:39:58.000Z",
  "title": "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",
  "authors": [
    "Frankie J. Encalada",
    "Leslie W. Looney",
    "Shigehisa Takakuwa",
    "John J. Tobin",
    "Nagayoshi Ohashi",
    "Jes K. Jørgensen",
    "Zhi-Yun Li",
    "Yuri Aikawa",
    "Yusuke Aso",
    "Patrick M. Koch",
    "Woojin Kwon",
    "Shih-Ping Lai",
    "Chang Won Lee",
    "Zhe-Yu Daniel Lin",
    "Alejandro Santamarıa-Miranda",
    "Itziar de Gregorio-Monsalvo",
    "Nguyen Thi Phuong",
    "Adele Plunkett",
    "Jinshi Sai",
    "Rajeeb Sharma",
    "Hsi-Wei Yen",
    "Ilseung Han"
  ],
  "comment": "33 pages, 29 figures, 6 tables",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP",
    "astro-ph.GA"
  ],
  "abstract": "Young protostellar binary systems, with expected ages less than $\\sim$10$^5$ years, are little modified since birth, providing key clues to binary formation and evolution. We present a first look at the young, Class 0 binary protostellar system R CrA IRAS 32 from the Early Planet Formation in Embedded Disks (eDisk) ALMA large program, which observed the system in the 1.3 mm continuum emission, $^{12}$CO (2-1), $^{13}$CO (2-1), C$^{18}$O (2-1), SO (6$_5$-5$_4$), and nine other molecular lines that trace disk, envelope, shocks, and outflows. With a continuum resolution of $\\sim$0.03$^{\\prime\\prime}$ ($\\sim$5 au, at a distance of 150 pc), we characterize the newly discovered binary system with a separation of 207 au, their circumstellar disks, and a circumbinary disk-like structure. The circumstellar disk radii are 26.9$\\pm$0.3 and 22.8$\\pm$0.3 au for sources A and B, respectively, and their circumstellar disk dust masses are estimated as 22.5$\\pm$1.1 and 12.4$\\pm$0.6 M$_{\\Earth}$. The circumstellar disks and the circumbinary structure have well aligned position angles and inclinations, indicating formation in a smooth, ordered process such as disk fragmentation. In addition, the circumstellar disks have a near/far-side asymmetry in the continuum emission suggesting that the dust has yet to settle into a thin layer near the midplane. Spectral analysis of CO isotopologues reveals outflows that originate from both of the sources and possibly from the circumbinary disk-like structure. Furthermore, we detect Keplerian rotation in the $^{13}$CO isotopologues toward both circumstellar disks and likely Keplerian rotation in the circumbinary structure; the latter suggests that it is probably a circumbinary disk.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-03-21T05:39:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "early planet formation",
      "circumstellar disk",
      "cra iras",
      "newly resolved class",
      "embedded disks"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 33,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}