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  • The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO). II. Dust and Gas Disk Properties in the Ophiuchus Star-forming Region

This content will become publicly available on July 31, 2026

Title: The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO). II. Dust and Gas Disk Properties in the Ophiuchus Star-forming Region
Abstract The ALMA survey of Gas Evolution in PROtoplanetary disks (AGE-PRO) Large Program aims to trace the evolution of gas disk mass and size throughout the lifetime of protoplanetary disks by using the Atacama Large Millimeter/submillimeter Array (ALMA). This paper presents Band-6 ALMA observations of 10 embedded (Class I and Flat Spectrum) sources in the Ophiuchus molecular cloud, with spectral types ranging from M3 to K6 stars, which serve as the evolutionary starting point in the AGE-PRO sample. While we find four nearly edge-on disks (≥70°), and three highly inclined disks (≥60°) in our sample, we show that, as a population, embedded disks in Ophiuchus are not significantly contaminated by more-evolved, but highly inclined sources. We derived dust disk masses from the Band-6 continuum and estimated gas disk masses from the C18OJ= 2−1 and C17OJ= 2−1 lines. The mass estimates from the C17O line are slightly higher, suggesting C18O emission might be partially optically thick. While the12CO and13CO lines are severely contaminated by extended emission and self-absorption, the C18O and C17O lines are allowed to trace the radial extent of the gaseous disks. From these measurements, we found that the C18OJ= 2−1 and C17OJ= 2−1 fluxes correlate well with each other and with the continuum fluxes. Furthermore, the C18O and C17O lines present a larger radial extension than disk dust sizes by factors ranging from ∼1.5 to ∼2.5, as is found for Class II disks using the radial extension of the12CO. In addition, we have detected outflows in three disks from12CO observations.  more » « less
Award ID(s):
2205617
PAR ID:
10646924
Author(s) / Creator(s):
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publisher / Repository:
The Astrophysical Journal
Date Published:
Journal Name:
The Astrophysical Journal
Volume:
989
Issue:
1
ISSN:
0004-637X
Page Range / eLocation ID:
2
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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