Early Planet Formation in Embedded Disks (eDisk) VI: Kinematic Structures around the Very Low Mass Protostar IRAS 16253-2429

• DOI: 10.48550/arxiv.2309.01891
• Publication Date: 2023-01-01
• Authors: Yusuke Aso; Woojin Kwon; Nagayoshi Ohashi; J. K. Jørgensen; John Tobin; Yuri Aikawa; I. de Gregorio‐Mo...; Ilseung Han; Miyu Kido; Patrick M. Koch; S. Lai; Chang Won Lee; Jeong‐Eun Lee; Zhi‐Yun Li; Zhe-Yu Daniel Lin; Leslie W. Looney; Suchitra Narayanan; Nguyễn Thị Phương; Jinshi Sai; Kazuya Saigo; Alejandro Santama...; Rajeeb Sharma; Shigehisa Takakuwa; Travis J. Thieme; Kengo Tomida; Jonathan P. Williams; Hsi-Wei Yen
• Keywords: Protostar

Precise estimates of protostellar masses are crucial to characterize the formation stars low down brown-dwarfs (BDs; M* < 0.08 Msun). The most accurate estimation mass uses Keplerian rotation in circumstellar disk around protostar. To apply method a protostar at low-mass end, we have observed Class 0 IRAS 16253-2429 using Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm continuum an angular resolution 0.07" (10 au), and 12CO, C18O, 13CO (J=2-1), SO (J_N = 6_5-5_4) molecular lines, as part ALMA Program Early Planet Formation Embedded Disks (eDisk). emission traces non-axisymmetric, disk-like structure perpendicular associated 12CO outflow. position-velocity (PV) diagrams C18O lines can be interpreted infalling rotating motions. In contrast, PV diagram along major axis line allows us identify rotation. central stellar radius estimated ~0.12-0.17 Msun ~13-19 au, respectively. suggests existence accretion shock ring (r~28 au) surrounding streamer from eastern side envelope. is not proto-BD but has close BD regime, our results provide typical picture such very protostars.