ALMA Super-resolution Survey of Ophiuchus Class I/Flat/II Disks: Discovery of New Substructures and Implications for Disk Evolution

Shoshi Ayumu  (Kyushu University)

Recently, high-resolution observations with the ALMA telescope (<0".10) have revealed a variety of Class II disk substructures and several Class I disks in the Ophiuchus star-forming region. However, these disks represent only a small fraction of the total, and the ALMA telescope's observation time and maximum baseline length. In this study, we applied super-resolution imaging, Sparse Modeling (SpM), to the ALMA archival data including 147 Ophiuchus disks (1.3 mm and spatial resolution of 0”.30). We obtained super-resolution continuous wave images of 67 objects with spatially resolved disk structures by SpM. We discovered substructures such as rings and local structures in 17 disks. Then, we measured the inclination angles of the disks and made comparisons for each stage of disk evolution. It was found that Class I and Flat disks accounted for more than 50% of the edge-on disks with an inclination of 70 degrees or more. The evolutionary stage of disks has been determined based on the flux slope in the near- and mid-red (SED). Our results show that Edge-on disks tend to increase the flux slope and appear younger than their actual evolutionary stage.