Astronomy and Astrophysics, volume 640A, 27-27 (2020/8-1)
Protoplanetary disk masses in NGC 2024: Evidence for two populations.
VAN TERWISGA S.E., VAN DISHOECK E.F., MANN R.K., DI FRANCESCO J., VAN DER MAREL N., MEYER M., ANDREWS S.M., CARPENTER J., EISNER J.A., MANARA C.F. and WILLIAMS J.P.
Abstract (from CDS):
Context. Protoplanetary disks in dense, massive star-forming regions are strongly affected by their environment. How this environmental impact changes over time is an important constraint on disk evolution and external photoevaporation models.
Aims. We characterize the dust emission from 179 disks in the core of the young (0.5Myr) NGC 2024 cluster. By studying how the disk mass varies within the cluster, and comparing these disks to those in other regions, we aim to determine how external photoevaporation influences disk properties over time.
Methods. Using the Atacama Large Millimeter/submillimeter Array, a 2.9'x 2.9' mosaic centered on NGC 2024 FIR 3 was observed at 225GHz with a resolution of 0.25'', or ∼100AU. The imaged region contains 179 disks identified at IR wavelengths, seven new disk candidates, and several protostars.
Results. The overall detection rate of disks is 32±4%. Few of the disks are resolved, with the exception of a giant (R=300AU) transition disk. Serendipitously, we observe a millimeter flare from an X-ray bright young stellar object (YSO), and resolve continuum emission from a Class 0 YSO in the FIR 3 core. Two distinct disk populations are present: a more massive one in the east, along the dense molecular ridge hosting the FIR 1-5 YSOs, with a detection rate of 45±7%. In the western population, towards IRS 1, only 15±4% of disks are detected.
Conclusions. NGC 2024 hosts two distinct disk populations. Disks along the dense molecular ridge are young (0.2-0.5Myr) and partly shielded from the far ultraviolet radiation of IRS 2b; their masses are similar to isolated 1-3Myr old SFRs. The western population is older and at lower extinctions, and may be affected by external photoevaporation from both IRS 1 and IRS 2b. However, it is possible these disks had lower masses to begin with.
© S. E. van Terwisga et al. 2020
stars: pre-main sequence - techniques: interferometric - protoplanetary disks
VizieR on-line data:
<Available at CDS (J/A+A/640/A27): table1.dat table2.dat tableb1.dat list.dat fits/*>
Status at CDS
Examining the need for a new acronym. // Tables of objects will be appraised for possible ingestion in SIMBAD.
Calibrators J0432-0120 and J0541-0211 not in SIMBAD.
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