Revealing Proper Motion of Protostars and Associated Outflows in the Ophiuchus by High-Resolution Observations

Kazuya Saigo  (Kagoshima University)

We have revealed the proper motions of protostars and the outflows associated with the Ophiuchus Star-Forming Cloud using high-resolution archival data with sub-0.1 arcsecond resolution from EVLA/ALMA/HST/JWST observations. Internal proper motion and the shape of outflows are important fossils and clues to understanding the complex formation history of such a protostellar group. In this study, we found that: 1. The proper motions of protostars in this region are consistent with nearby more evolved young stars (CTTSs) as indicated by Gaia DR3. 2. The internal proper motion of GY30 can be interpreted as being ejected from the GSS30 IRS1 (binary) system tens of thousands of years ago. It seems to be the origin of the bow-shaped outflows associated with GY30. 3. The orbital period of the VLA1623 Aa/Ab proto-binary system is approximately 300 years, and this motion is the origin of the wiggled structures observed in the outflows.