Survey of Orion Disks with ALMA (SODA) II: UV-driven disk mass loss in L1641 and L1647

Abstract

External FUV irradiation of protoplanetary disks has an important impact on their evolution and ability to form planets. However, nearby (<300 pc) star-forming regions lack sufficiently massive young stars, while the Trapezium Cluster and NGC 2024 have complicated star-formation histories and their O-type stars' intense radiation fields ($>10^4{G}_0$) destroy disks too quickly to study this process in detail. We study disk mass loss driven by intermediate (10 - 1000 $G_0$) FUV radiation fields in L1641 and L1647, where it is driven by more common A0 and B-type stars. Using the large (N=873) sample size offered by the Survey of Orion Disks with ALMA (SODA), we search for trends in the median disk dust mass with FUV field strength across the region as a whole and in two separate regions containing a large number of irradiated disks. For radiation fields between 1 - 100 $G_0$, the median disk mass in the most irradiated disks drops by a factor $\sim 2$ over the lifetime of the region, while the 95th percentile of disk masses drops by a factor 4 over this range. This effect is present in multiple populations of stars, and localized in space, to within 2 pc of ionizing stars. We fit an empirical irradiation - disk mass relation for the first time: $M_{\mathrm{dust},\mathrm{median}}=-1.3_{-0.13}^{+0.14}{\log }_{10}(F_{\mathrm{FUV}}/G_0)+5.2_{-0.19}^{+0.18}$. This work demonstrates that even intermediate FUV radiation fields have a significant impact on the evolution of protoplanetary disks.

Accepted to A&A Letters. 5 pages, 4 figures

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• A Novel Method to Estimate the FUV Flux and a Catalogue for Star-Hosting Discs in Nearby Star-Forming Regions
• The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO): VIII. The impact of external photoevaporation on disk masses and radii in Upper Scorpius
• A New Look at Disk Winds and External Photoevaporation in the $\sigma$-Orionis Cluster
• A complete Herbig disk mass survey in Orion
• Using simultaneous mass accretion and external photoevaporation rates for d203-504 to constrain disc evolution processes
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• Survey of Orion Disks with ALMA (SODA) III: Disks in wide binary systems in L1641 and L1647
• First detection of the $J_{-1}\to (J-$ 1)${}_0-E$ methanol maser transitions at $J=7$ and $10$
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