The ALMA-QUARKS survey: A Keplerian Circumbinary Disk Candidate in the High-mass Star-forming Region IRAS 08303-4303

@misc{lee2026almaquarks,
  title = {{The ALMA-QUARKS survey: A Keplerian Circumbinary Disk Candidate in the High-mass Star-forming Region IRAS 08303-4303}},
  author = {Gyuho Lee and Kee-Tae Kim and Tie Liu and Xunchuan Liu and Sheng-Yuan Liu and Lei Zhu and Guido Garay and Jihyun Kang and Hyeong-Sik Yun and Hong-Li Liu and Sami Dib and James O. Chibueze and Jianjun Zhou and Siju Zhang and Di Li and Pablo Garcia and Swagat R. Das and Lokesh Dewangan and Prasanta Gorai and Suinan Zhang and Aiyuan Yang and Manuel Merello and Leonardo Bronfman and Mika Juvela and Xindi Tang and Wenyu Jiao and Fengwei Xu and Zhiyuan Ren and Tapas Baug and Jihye Hwang and Patricio Sanhueza and Yankun Zhang and Xu Zhang and Chang Won Lee and Dongting Yang and Xiaofeng Mai},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.30811},
  eprint = {2610.30811},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.30811},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - The ALMA-QUARKS survey: A Keplerian Circumbinary Disk Candidate in the High-mass Star-forming Region IRAS 08303-4303
AU  - Gyuho Lee
AU  - Kee-Tae Kim
AU  - Tie Liu
AU  - Xunchuan Liu
AU  - Sheng-Yuan Liu
AU  - Lei Zhu
AU  - Guido Garay
AU  - Jihyun Kang
AU  - Hyeong-Sik Yun
AU  - Hong-Li Liu
AU  - Sami Dib
AU  - James O. Chibueze
AU  - Jianjun Zhou
AU  - Siju Zhang
AU  - Di Li
AU  - Pablo Garcia
AU  - Swagat R. Das
AU  - Lokesh Dewangan
AU  - Prasanta Gorai
AU  - Suinan Zhang
AU  - Aiyuan Yang
AU  - Manuel Merello
AU  - Leonardo Bronfman
AU  - Mika Juvela
AU  - Xindi Tang
AU  - Wenyu Jiao
AU  - Fengwei Xu
AU  - Zhiyuan Ren
AU  - Tapas Baug
AU  - Jihye Hwang
AU  - Patricio Sanhueza
AU  - Yankun Zhang
AU  - Xu Zhang
AU  - Chang Won Lee
AU  - Dongting Yang
AU  - Xiaofeng Mai
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.30811
UR  - https://arxiv.org/abs/2610.30811
AB  - We present the ALMA Band 6 continuum and molecular line observations of IRAS 08303-4303, a high-mass star-forming region, with an angular resolution of ∼ 0.3'' (∼ 700 au at the distance of 2.35 kpc). Six dense condensations are identified in the 1.3 mm continuum, and at least four of them are associated with molecular outflows. The estimated outflow parameters, particularly mass outflow rates ≥ 10^−4 M_⊙ yr^−1, suggest that the driving sources are high-mass young stellar objects. Two of the condensations are forming a wide protobinary system with a separation of ∼ 900 au. They reside within a single rotating structure, identified as a circumbinary disk which has a mass of about 2 M_⊙. This structure is traced by multiple molecular lines and exhibits a Keplerian rotation pattern. Based on the Keplerian rotation assumption, the enclosed mass is derived to be between 32 and 61 M_⊙: 22-43 M_⊙ for the primary and 10-18 M_⊙ for the secondary. The circumbinary disk is on the whole gravitationally stable, yet some parts with Toomre Q < 2 indicate potential fragmentation. Various molecular lines reveal a streamer-like structure connecting to the circumbinary disk, suggesting transfer of material from the envelope to the protobinary system through it. Despite the observational rarity of such circumbinary disks around high-mass YSOs, the high binary fraction among massive stars underscores their significance. This source, therefore, serves as a key laboratory for understanding the formation of high-mass binary systems.
ER  -