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
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2024
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| author | Encalada, Frankie J. Looney, Leslie W. Takakuwa, Shigehisa Tobin, John J. Ohashi, Nagayoshi Jørgensen, Jes K. Li, Zhi-Yun Aikawa, Yuri Aso, Yusuke Koch, Patrick M. Kwon, Woojin Lai, Shih-Ping Lee, Chang Won Lin, Zhe-Yu Daniel Santamarıa-Miranda, Alejandro de Gregorio-Monsalvo, Itziar Phuong, Nguyen Thi Plunkett, Adele Sai, Jinshi Sharma, Rajeeb Yen, Hsi-Wei Han, Ilseung |
| author_facet | Encalada, Frankie J. Looney, Leslie W. Takakuwa, Shigehisa Tobin, John J. Ohashi, Nagayoshi Jørgensen, Jes K. Li, Zhi-Yun Aikawa, Yuri Aso, Yusuke Koch, Patrick M. Kwon, Woojin Lai, Shih-Ping Lee, Chang Won Lin, Zhe-Yu Daniel Santamarıa-Miranda, Alejandro de Gregorio-Monsalvo, Itziar Phuong, Nguyen Thi Plunkett, Adele Sai, Jinshi Sharma, Rajeeb Yen, Hsi-Wei Han, Ilseung |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_14143 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | 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 Encalada, Frankie J. Looney, Leslie W. Takakuwa, Shigehisa Tobin, John J. Ohashi, Nagayoshi Jørgensen, Jes K. Li, Zhi-Yun Aikawa, Yuri Aso, Yusuke Koch, Patrick M. Kwon, Woojin Lai, Shih-Ping Lee, Chang Won Lin, Zhe-Yu Daniel Santamarıa-Miranda, Alejandro de Gregorio-Monsalvo, Itziar Phuong, Nguyen Thi Plunkett, Adele Sai, Jinshi Sharma, Rajeeb Yen, Hsi-Wei Han, Ilseung Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies 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. |
| 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 |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.14143 |