Misaligned Rotations of the Envelope, Outflow, and Disks in the Multiple Protostellar System of VLA 1623-2417: FAUST. III

Satoshi Ohashi , Claudio Codella (1) , Nami Sakai , Claire J. Chandler , Cecilia Ceccarelli (1) , Felipe Alves , Davide Fedele , Tomoyuki Hanawa , Aurora Durán , Cécile Favre (1) , Ana López-Sepulcre (1) , Laurent Loinard , Seyma Mercimek , Nadia M. Murillo , Linda Podio , Yichen Zhang , Yuri Aikawa , Nadia Balucani , Eleonora Bianchi (1) , Mathilde Bouvier (1) , Gemma Busquet (1) , Paola Caselli , Emmanuel Caux (2) , Steven Charnley , Spandan Choudhury , Nicolas Cuello (1) , Marta de Simone (1) , Francois Dulieu , Lucy Evans , Siyi Feng , Francesco Fontani , Logan Francis , Tetsuya Hama , Eric Herbst , Shingo Hirano , Tomoya Hirota , Muneaki Imai , Andrea Isella , Izaskun Jímenez-Serra , Doug Johnstone , Claudine Kahane (1) , Romane Le Gal (2) , Bertrand Lefloch (1) , Luke T. Maud , Maria Jose Maureira , Francois Menard (1) , Anna Miotello , George Moellenbrock , Shoji Mori , Riouhei Nakatani , Hideko Nomura , Yasuhiro Oba , Ross O'Donoghue , Yuki Okoda , Juan Ospina-Zamudio (1) , Yoko Oya , Jaime Pineda , Albert Rimola , Takeshi Sakai , Dominique Segura-Cox , Yancy Shirley , Brian Svoboda , Vianney Taquet , Leonardo Testi , Charlotte Vastel (2) , Serena Viti , Naoki Watanabe , Yoshimasa Watanabe , Arezu Witzel (1) , Ci Xue , Bo Zhao , Satoshi Yamamoto

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
2 IRAP - Institut de recherche en astrophysique et planétologie

We report a study of the low-mass Class 0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using H¹³CO⁺ (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 circumbinary VLA 1623A disk, as well as the VLA 1623B disk. We found that the minor axis of the circumbinary disk of VLA 1623A is misaligned by about 12° with respect to the large-scale outflow and the rotation axis of the envelope. In contrast, the minor axis of the circumbinary 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 circumbinary disk. The origin of its opposite gradient is also discussed.

Keywords: Star formation; Stellar jets; Protostars; Circumstellar disks; Young stellar objects; Interstellar medium; Interstellar molecules; Astrochemistry

Domains: Sciences of the Universe [physics]; Astrophysics [astro-ph]

Satoshi Ohashi, Claudio Codella, Nami Sakai, Claire J. Chandler, Cecilia Ceccarelli, et al.. Misaligned Rotations of the Envelope, Outflow, and Disks in the Multiple Protostellar System of VLA 1623-2417: FAUST. III. The Astrophysical Journal, 2022, 927, ⟨10.3847/1538-4357/ac4cae⟩. ⟨insu-03672047⟩