Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope - Results from the Early Release Science Ice Age program

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Volume 693 (January 2025)

A&A, 693 (2025) A288

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Table 3

Ice column densities and abundances with respect to H₂O ice towards Ced 110 IRS4A and IRS4B compared with literature values.

Species	N_ice (10¹⁷ cm⁻²)		$X_{H_{2} O} (%)$ ${X_{{{\rm{H}}_{\rm{2}}}{\rm{O}}}}\left( \% \right)$		Literature (% H₂O)

	IRS4A^(a)	IRS4B	IRS4A	IRS4B	LYSOs ^(b)	NIR38 ^(e)	J110621 ^(f)	Comet 67P/C-G ^(f)
H₂O	45.2±2.3	${63.5}_{48.1}^{69.3}$ $63.5_{48.1}^{69.3}$	100	100	100	100	100	100
¹²CO₂	${11.1}_{9.7}^{15.0}$ $11.1_{9.7}^{15.0}$	${7.1}_{6.8}^{7.9}$ $7.1_{6.8}^{7.9}$	24.5	11.2	$28_{23}^{37}$ $28_{23}^{37}$	${20.1}_{7.3}^{38.7}$ $20.1_{7.3}^{38.7}$	${13.0}_{6.1}^{19.0}$ $13.0_{6.1}^{19.0}$	4.7±1.4
¹³CO₂	…	0.1±0.01	…	0.2	…	0.3	0.3	…
¹²CO	…	${6.6}_{5.9}^{7.2}$ $6.6_{5.9}^{7.2}$	…	10.4	$21_{12}^{35}$ $21_{12}^{35}$	${43.1}_{20.0}^{65.4}$ $43.1_{20.0}^{65.4}$	${27.5}_{13.0}^{47.2}$ $27.5_{13.0}^{47.2}$	3.1±0.9
CH₄	${0.78}_{0.52}^{1.0} ({0.80}_{0.55}^{1.12})$ $0.78_{0.52}^{1.0}\left( {0.80_{0.55}^{1.12}} \right)$	…	1.7 (1.8)	…	${4.5}_{3}^{6}$	${2.6}_{1.4}^{4.8}$ $2.6_{1.4}^{4.8}$	${1.9}_{0.9}^{2.4}$ $1.9_{0.9}^{2.4}$	0.340±0.07
SO₂	${0.11}_{0.06}^{0.17} ({0.09}_{0.07}^{0.15})$ $0.11_{0.06}^{0.17}\left( {0.09_{0.07}^{0.15}} \right)$	…	0.2 (0.2)	…	0.2^c	0.05	0.04	0.127±0.100
NH₃	${2.88}_{1.90}^{3.86} (0.0)$ $2.88_{1.90}^{3.86}(0.0)$	${5.7}_{2.1}^{6.3}$ $5.7_{2.1}^{6.3}$	6.4 (0.0)	8.9	$6_{4}^{8}$	${4.4}_{2.1}^{10.6}$ $4.4_{2.1}^{10.6}$	${5.0}_{2.5}^{8.6}$ $5.0_{2.5}^{8.6}$	0.67±0.20
HCOOH	${0.92}_{0.56}^{1.28} ({0.41}_{0.22}^{0.61})$ $0.92_{0.56}^{1.28}\left( {0.41_{0.22}^{0.61}} \right)$	…	2.0 (0.9)	…	<0.5–4^(d), 1.0^(c)	…	…	0.013±0.008
CH₃OH	${0.94}_{0.70}^{1.3} ({0.89}_{0.67}^{1.05})$ $0.94_{0.70}^{1.3}\left( {0.89_{0.67}^{1.05}} \right)$	${3.85}_{2.7}^{5.2}$ $3.85_{2.7}^{5.2}$	2.1 (2.0)	6.1	$6_{5}^{12}$ $6_5^{12}$	${8.9}_{2.6}^{17.7}$ $8.9_{2.6}^{17.7}$	${3.9}_{2.5}^{8.2}$ $3.9_{2.5}^{8.2}$	0.21±0.06
OCN⁻	${0.92}_{0.46}^{1.4} ({0.63}_{0.35}^{0.82})$ $0.92_{0.46}^{1.4}\left( {0.63_{0.35}^{0.82}} \right)$	…	2.0 (1.4)	…	${0.6}_{0.4}^{0.8}, 1.2$ $0.6_{0.4}^{0.8},1.2$ ^(c)	0.3	0.3	…
N₂O	${0.81}_{0.53}^{1.10} ({0.85}_{0.55}^{1.21})$ $0.81_{0.53}^{1.10}\left( {0.85_{0.55}^{1.21}} \right)$	…	1.8 (1.9)	…	…	…	…	…

Upper limits

${NH}_{4}^{+}$ ${\rm{NH}}_4^ +$	<6.5	…	<14.3	…	$11_{7}^{15}$	<6	<8	…
H₂CO	<3.4	…	<7.5	…	∼6	…	…	0.32±0.1

Notes. This table shows literature values for LYSOs, the two field stars probing lines of sight towards Chamaleon I (NIR38 and J110621), and the comet 67P/G-C. ^(a)Values inside parentheses are calculated based on the data after polynomial silicate subtraction. ^(b)When not indicated otherwise, the values correspond to the median and lower and upper quartile values from summarised by Boogert et al. (2015), ^(c)Rocha et al. (2024b): IRAS 2A, ^(d)Öberg et al. (2011), ^(e)McClure et al. (2023), ^(f)Rubin et al. (2019).

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