Post-outburst chemistry in a Very Low-Luminosity Object - Peculiar high abundance of nitric oxide

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Volume 691 (November 2024)

A&A, 691 (2024) A281

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Table 1.

Column densities for the detected species.

		N_obs (10¹¹ cm⁻²)
Species	T_ex = 10 K	T_ex = 30 K	T_ex = 50 K
HCN	3.02 $_{- 0.51}^{+ 0.53}$ $^{+0.53}_{-0.51}$	1.51 $_{- 0.22}^{+ 0.25}$ $^{+0.25}_{-0.22}$	1.74 $_{- 0.30}^{+ 0.29}$ $^{+0.29}_{-0.30}$
DCN	0.51 $_{- 0.08}^{+ 0.06}$ $^{+0.06}_{-0.08}$	0.36 $_{- 0.04}^{+ 0.05}$ $^{+0.05}_{- 0.04}$	0.44 $_{- 0.07}^{+ 0.06}$ $^{+0.06}_{-0.07}$
HCO⁺	18.62 $_{- 2.77}^{+ 3.26}$ $^{+3.26}_{-2.77}$	7.59 $_{- 0.93}^{+ 0.83}$ $^{+0.83}_{-0.93}$	8.71 $_{- 1.07}^{+ 0.95}$ $^{+0.95}_{-1.07}$
DCO⁺	4.27 $_{- 1.25}^{+ 1.23}$ $^{+1.23}_{-1.25}$	2.75 $_{- 0.79}^{+ 0.76}$ $^{+0.76}_{-0.79}$	3.47 $_{- 0.90}^{+ 0.96}$ $^{+0.96}_{- 0.90}$
HNC	18.20 $_{1.60}^{+ 1.30}$ $^{+1.30}_{1.60}$	7.59 $_{- 0.73}^{+ 0.51}$ $^{+0.51}_{-0.73 }$	8.71 $_{- 0.62}^{+ 0.58}$ $^{+0.58}_{- 0.62}$
N₂D⁺	1.32 $_{- 0.32}^{+ 0.34}$ $^{+0.34}_{-0.32}$	0.83 $_{- 0.20}^{+ 0.22}$ $^{+0.22}_{-0.20}$	0.10 $_{- 0.02}^{+ 0.03}$ $^{+0.03}_{- 0.02}$
NO	1000.00 $_{- 160.11}^{+ 96.48}$ $^{+96.48}_{-160.11}$	707.95 $_{- 76.99}^{+ 86.38}$ $^{+86.38}_{-76.99}$	912.01 $_{- 99.18}^{+ 111.28}$ $^{+111.28}_{-99.18}$
D₂CO	0.79 $_{- 0.20}^{+ 0.22}$ $^{+0.22}_{- 0.20}$	0.54 $_{- 0.14}^{+ 0.15}$ $^{+0.15}_{- 0.14}$	0.79 $_{- 0.21}^{+ 0.22}$ $^{+0.22}_{-0.21}$
SO	32.73 $_{- 7.90}^{+ 7.54}$ $^{+7.54}_{-7.90}$	8.51 $_{- 0.28}^{+ 0.28}$ $^{+0.28}_{-0.28}$	8.41 $_{- 0.31}^{+ 0.32}$ $^{+0.32}_{- 0.31}$
C₂D	4.67 $_{- 1.08}^{+ 1.05}$ $^{+1.05}_{-1.08}$	3.24 $_{- 0.75}^{+ 0.72}$ $^{+0.72}_{-0.75}$	4.07 $_{- 0.94}^{+ 0.91}$ $^{+0.91}_{-0.94}$
CH₃OH	97.72 $_{- 31.14}^{+ 28.48}$ $^{+28.48}_{-31.14}$	-	-
H₂CO	20.95 $_{- 3.74}^{+ 3.61}$ $^{+3.61}_{-3.74}$	-	-

Notes. The column densities were derived via the grid-fitting method for T_ex of 10, 30, and 50 K with the exception of CH₃OH and H₂CO, where only the values calculated at 10 K are shown (see text for discussion).

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