2022MNRAS.514.3604R

Query : 2022MNRAS.514.3604R

2022MNRAS.514.3604R - Mon. Not. R. Astron. Soc., 514, 3604-3611 (2022/August-2)

A survey of HDCO and D2CO towards Class 0/I proto-brown dwarfs.

RIAZ B. and THI W.-F.

Abstract (from CDS):

Deuterium fractionation can constrain the physical and chemical conditions at the early stage of brown dwarf formation. We present IRAM 30-m observations over a wide frequency range of 213-279 GHz of singly and doubly deuterated species of formaldehyde (HDCO and D2CO) towards Class 0/I proto-brown dwarfs (proto-BDs). Multiple low-excitation HDCO and D2CO transition lines with upper energy level <=40 K are detected. The D2CO/HDCO, HDCO/H2CO, and D2CO/H2CO abundance ratios range between 0.01 and 2.5 for the proto-BDs, similar to the range seen in low-mass protostars. The highest ratios of D2CO/HDCO ∼1.3-2.5 are measured for two Stage 0 proto-BDs. These objects could possess a warm corino, similar to the few hot corino cases reported among Class 0 protostars. The mean D2CO/HDCO, D2CO/H2CO, and HDCO/H2CO ratios for the proto-BDs are comparatively higher than the range predicted by the current gas-grain chemical models, indicating that HDCO and D2CO are formed via grain surface reactions in the dense and cold interiors of the proto-BDs at an early formation stage.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): astrochemistry - brown dwarfs - stars: evolution - stars: formation - ISM: abundances - ISM: molecules

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J03283875+3118068 Y*O 03 28 38.754 +31 18 06.83           ~ 15 0
2 2MASS J03284872+3116086 Y*O 03 28 48.721 +31 16 08.65           ~ 15 0
3 2MASS J03285129+3117397 Y*O 03 28 51.291 +31 17 39.79           ~ 28 0
4 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 513 3
5 2MASS J03285920+3120327 Y*? 03 28 59.202 +31 20 32.76           ~ 11 0
6 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
7 ALMA J162625.63-242429.5 Y*O 16 26 25.62 -24 24 28.9           ~ 49 1
8 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
9 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
10 [HMH2007] 24 Y*O 18 28 44.78 +00 51 25.8           ~ 20 1
11 [DCE2008] 204 cor 18 28 54.91 +00 18 32.7           M5: 21 2
12 [HMH2007] 46 Y*O 18 28 56.64 +00 30 08.3           ~ 9 0
13 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
14 [GFM2007] 32 Y*O 18 29 52.20 +01 15 59.0           ~ 10 0
15 SSTc2d J182959.3+011041 Y*O 18 29 59.38 +01 10 40.9           ~ 17 0

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