2020A&A...640A..27V


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET04:26:07

2020A&A...640A..27V - 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.

Abstract Copyright: © S. E. van Terwisga et al. 2020

Journal keyword(s): 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.

CDS comments: Calibrators J0432-0120 and J0541-0211 not in SIMBAD.

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1226 0
2 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 656 1
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3572 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2019 1
5 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1285 1
6 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1485 1
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3756 0
8 OMC 2 MoC 05 35 27 -05 10.1           ~ 394 1
9 NAME Ori A MoC 05 38 -07.1           ~ 2704 0
10 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 492 0
11 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 747 0
12 NGC 2024 1 Y*O 05 41 37.8540355489 -01 54 36.625596390   13.58 12.17     B0.5V 48 0
13 2MASS J05414134-0153326 Y*O 05 41 41.3524630 -01 53 32.838938           ~ 10 0
14 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1188 0
15 [MCK88] NGC 2024 FIR 3 PoC 05 41 43.00 -01 54 24.0           ~ 49 0
16 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1077 1
17 2MASS J05414404-0154444 Y*O 05 41 44.047 -01 54 44.42           ~ 6 0
18 [BCB89] IRS 2 Y*O 05 41 45.81 -01 54 29.8           B 95 0
19 NAME Cha I MoC 11 06 48 -77 18.0           ~ 990 1
20 THA 15-12 Or* 15 56 09.2067120748 -37 56 06.126159332   13.12 11.93 11.45   M0e 262 0
21 NAME Lup Cloud SFR 16 03 -38.1           ~ 535 0
22 NAME Upper Sco Association As* 16 12 -23.4           ~ 1064 1
23 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 616 0
24 [GY92] 91 Y*O 16 26 40.46952 -24 27 14.4720           ~ 63 1
25 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3083 0
26 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 935 2
27 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 455 1

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2020.11.25-04:26:07

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