FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 1623$-$2417
Creators: name: Ohashi, Satoshi
name: Codella, Claudio
name: Sakai, Nami
name: Chandler, Claire J.
name: Ceccarelli, Cecilia
name: Alves, Felipe
name: Fedele, Davide
name: Hanawa, Tomoyuki
name: Durán, Aurora
name: Favre, Cécile
name: López-Sepulcre, Ana
name: Loinard, Laurent
name: Mercimek, Seyma
name: Murillo, Nadia M.
name: Podio, Linda
name: Zhang, Yichen
name: Aikawa, Yuri
name: Balucani, Nadia
name: Bianchi, Eleonora
name: Bouvier, Mathilde
name: Busquet, Gemma
name: Caselli, Paola
name: Caux, Emmanuel
name: Charnley, Steven
name: Choudhury, Spandan
name: Cuello, Nicolas
name: De Simone, Marta
name: Dulieu, Francois
name: Evans, Lucy
name: Feng, Siyi
name: Fontani, Francesco
name: Francis, Logan
name: Hama, Tetsuya
name: Herbst, Eric
name: Hirano, Shingo
name: Hirota, Tomoya
name: Imai, Muneaki
name: Isella, Andrea
name: Jímenez-Serra, Izaskun
name: Johnstone, Doug
name: Kahane, Claudine
name: Gal, Romane Le
name: Lefloch, Bertrand
name: Maud, Luke T.
name: Maureira, Maria Jose
name: Menard, Francois
name: Miotello, Anna
name: Moellenbrock, George
name: Mori, Shoji
name: Nakatani, Riouhei
name: Nomura, Hideko
name: Oba, Yasuhiro
name: O'Donoghue, Ross
name: Okoda, Yuki
name: Ospina-Zamudio, Juan
name: Oya, Yoko
name: Pineda, Jaime
name: Rimola, Albert
name: Sakai, Takeshi
name: Segura-Cox, Dominique
name: Shirley, Yancy
name: Svoboda, Brian
name: Taquet, Vianney
name: Testi, Leonardo
name: Vastel, Charlotte
name: Viti, Serena
name: Watanabe, Naoki
name: Watanabe, Yoshimasa
name: Witzel, Arezu
name: Xue, Ci
name: Zhao, Bo
name: Yamamoto, Satoshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a study of the low-mass Class-0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using H$^{13}$CO$^+$ ($J=3-2$), CS ($J=5-4$), and CCH ($N=3-2$) lines as part of the ALMA Large Program FAUST. The analysis of the velocity fields revealed the rotation motion in the envelope and the velocity gradients in the outflows (about 2000 au down to 50 au). We further investigated the rotation of the circum-binary VLA 1623A disk as well as the VLA 1623B disk. We found that the minor axis of the circum-binary disk of VLA 1623A is misaligned by about 12 degrees with respect to the large-scale outflow and the rotation axis of the envelope. In contrast, the minor axis of the circum-binary disk is parallel to the large-scale magnetic field according to previous dust polarization observations, suggesting that the misalignment may be caused by the different directions of the envelope rotation and the magnetic field. If the velocity gradient of the outflow is caused by rotation, the outflow has a constant angular momentum and the launching radius is estimated to be $5-16$ au, although it cannot be ruled out that the velocity gradient is driven by entrainments of the two high-velocity outflows. Furthermore, we detected for the first time a velocity gradient associated with rotation toward the VLA 16293B disk. The velocity gradient is opposite to the one from the large-scale envelope, outflow, and circum-binary disk. The origin of its opposite gradient is also discussed.
description: 27 pages, 21 figures, 2 Tables, Accepted for publication in ApJ