The hot corino-like chemistry of four FUor-like protostars

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Volume 696 (April 2025)

A&A, 696 (2025) A18

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Table 3

Best-fit parameters obtained for the L1551 IRS 5 northern disk using two different approaches.

Species	n_lines	E_up (K)	N (cm⁻²)	T_ex (K)	FWHM (km s⁻¹)	v_LSR (km s⁻¹)	s (″)
COMs with free parameters

CH₃OH	18	56–946	$({1.72}_{- 0.08}^{+ 0.08}) \times 10^{19}$ ${\left( {1.72_{ - 0.08}^{ + 0.08}} \right) \times {{10}^{19}}}$	${294.90}_{- 4.40}^{+ 3.41}$ ${294.90_{ - 4.40}^{ + 3.41}}$	${1.97}_{- 0.03}^{+ 0.03}$ ${1.97_{ - 0.03}^{ + 0.03}}$	${9.59}_{- 0.01}^{+ 0.02}$ ${9.59_{ - 0.01}^{ + 0.02}}$	${0.05}_{- 0.01}^{+ 0.01}$ ${0.05_{ - 0.01}^{ + 0.01}}$
CH₃OH^a	7	657–946	$({1.11}_{- 0.12}^{+ 0.17}) \times 10^{20}$ ${\left( {1.11_{ - 0.12}^{ + 0.17}} \right) \times {{10}^{20}}}$	${140.30}_{- 4.60}^{+ 3.90}$ ${140.30_{ - 4.60}^{ + 3.90}}$	${1.92}_{- 0.04}^{+ 0.06}$ ${1.92_{ - 0.04}^{ + 0.06}}$	${9.77}_{- 0.03}^{+ 0.03}$ ${9.77_{ - 0.03}^{ + 0.03}}$	${0.05}_{- 0.01}^{+ 0.01}$ ${0.05_{ - 0.01}^{ + 0.01}}$
¹³CH₃OH	3	162–254	$({1.22}_{- 0.10}^{+ 0.25}) \times 10^{17}$ ${\left( {1.22_{ - 0.10}^{ + 0.25}} \right) \times {{10}^{17}}}$	${128.40}_{- 13.00}^{+ 9.20}$ ${128.40_{ - 13.00}^{ + 9.20}}$	${1.98}_{- 0.09}^{+ 0.12}$ ${1.98_{ - 0.09}^{ + 0.12}}$	${9.72}_{- 0.04}^{+ 0.04}$ ${9.72_{ - 0.04}^{ + 0.04}}$	${0.25}_{- 0.06}^{+ 0.03}$ ${0.25_{ - 0.06}^{ + 0.03}}$
CH₃¹⁸OH	9	33–96	$({1.12}_{- 0.10}^{+ 0.16}) \times 10^{16}$ ${\left( {1.12_{ - 0.10}^{ + 0.16}} \right) \times {{10}^{16}}}$	${91.31}_{- 8.76}^{+ 7.98}$ ${91.31_{ - 8.76}^{ + 7.98}}$	${2.56}_{- 0.16}^{+ 0.21}$ ${2.56_{ - 0.16}^{ + 0.21}}$	${9.75}_{- 0.05}^{+ 0.05}$ ${9.75_{ - 0.05}^{ + 0.05}}$	${0.42}_{- 0.04}^{+ 0.04}$ ${0.42_{ - 0.04}^{ + 0.04}}$
CH₂DOH	9	49–352	$({6.57}_{- 0.54}^{+ 0.57}) \times 10^{18}$ ${\left( {6.57_{ - 0.54}^{ + 0.57}} \right) \times {{10}^{18}}}$	${145.60}_{- 5.30}^{+ 4.90}$ ${145.60_{ - 5.30}^{ + 4.90}}$	${1.94}_{- 0.13}^{+ 0.13}$ ${1.94_{ - 0.13}^{ + 0.13}}$	${10.06}_{- 0.06}^{+ 0.06}$ ${10.06_{ - 0.06}^{ + 0.06}}$	${0.05}_{- 0.01}^{+ 0.01}$ ${0.05_{ - 0.01}^{ + 0.01}}$
CH₂DOH^b	6	49–352	$({5.25}_{- 0.72}^{+ 0.90}) \times 10^{18}$ ${\left( {5.25_{ - 0.72}^{ + 0.90}} \right) \times {{10}^{18}}}$	${210.30}_{- 12.50}^{+ 24.70}$ ${210.30_{ - 12.50}^{ + 24.70}}$	${1.78}_{- 0.04}^{+ 0.05}$ ${1.78_{ - 0.04}^{ + 0.05}}$	${9.98}_{- 0.02}^{+ 0.03}$ ${9.98_{ - 0.02}^{ + 0.03}}$	${0.06}_{- 0.01}^{+ 0.01}$ ${0.06_{ - 0.01}^{ + 0.01}}$
CH₃CHO	27	6 –387	$({1.12}_{- 0.15}^{+ 0.23}) \times 10^{17}$ $\left( {1.12_{ - 0.15}^{ + 0.23}} \right) \times {10^{17}}$	${212.30}_{- 6.30}^{+ 8.40}$ $212.30_{ - 6.30}^{ + 8.40}$	${2.28}_{- 0.05}^{+ 0.06}$ $2.28_{ - 0.05}^{ + 0.06}$	${9.80}_{- 0.02}^{+ 0.02}$ $9.80_{ - 0.02}^{ + 0.02}$	${0.07}_{- 0.01}^{+ 0.01}$ $0.07_{ - 0.01}^{ + 0.01}$
CH₃OCH₃	8	81–253	$({9.57}_{- 0.51}^{+ 0.65}) \times 10^{16}$ $\left( {9.57_{ - 0.51}^{ + 0.65}} \right) \times {10^{16}}$	${184.60}_{- 5.90}^{+ 6.20}$ $184.60_{ - 5.90}^{ + 6.20}$	${2.59}_{- 0.06}^{+ 0.06}$ $2.59_{ - 0.06}^{ + 0.06}$	${9.31}_{- 0.03}^{+ 0.03}$ $9.31_{ - 0.03}^{ + 0.03}$	${0.26}_{- 0.01}^{+ 0.01}$ $0.26_{ - 0.01}^{ + 0.01}$
CH₃OCHO	34	106–412	$({3.58}_{- 0.22}^{+ 0.30}) \times 10^{17}$ ${\left( {3.58_{ - 0.22}^{ + 0.30}} \right) \times {{10}^{17}}}$	${162.50}_{- 8.48}^{+ 5.40}$ ${162.50_{ - 8.48}^{ + 5.40}}$	${2.11}_{- 0.04}^{+ 0.05}$ ${2.11_{ - 0.04}^{ + 0.05}}$	${9.55}_{- 0.02}^{+ 0.02}$ ${9.55_{ - 0.02}^{ + 0.02}}$	${0.09}_{- 0.01}^{+ 0.01}$ ${0.09_{ - 0.01}^{ + 0.01}}$
CH₃COCH₃	13	111–116	$({6.55}_{- 3.35}^{+ 5.46}) \times 10^{16}$ ${\left( {6.55_{ - 3.35}^{ + 5.46}} \right) \times {{10}^{16}}}$	${104.60}_{- 10.40}^{+ 10.10}$ ${104.60_{ - 10.40}^{ + 10.10}}$	${2.38}_{- 0.22}^{+ 0.26}$ ${2.38_{ - 0.22}^{ + 0.26}}$	${9.60}_{- 0.08}^{+ 0.07}$ ${9.60_{ - 0.08}^{ + 0.07}}$	${0.05}_{- 0.01}^{+ 0.02}$ ${0.05_{ - 0.01}^{ + 0.02}}$
C₂H₅OH	24	24–464	$({5.24}_{- 2.04}^{+ 1.52}) \times 10^{17}$ $\left( {5.24_{ - 2.04}^{ + 1.52}} \right) \times {10^{17}}$	${190.70}_{- 23.30}^{+ 19.60}$ $190.70_{ - 23.30}^{ + 19.60}$	${2.23}_{- 0.10}^{+ 0.09}$ $2.23_{ - 0.10}^{ + 0.09}$	${9.95}_{- 0.03}^{+ 0.03}$ $9.95_{ - 0.03}^{ + 0.03}$	${0.07}_{- 0.01}^{+ 0.02}$ $0.07_{ - 0.01}^{ + 0.02}$
C₂H₅CN	20	147–368	$({2.43}_{- 0.07}^{+ 0.07}) \times 10^{15}$ $\left( {2.43_{ - 0.07}^{ + 0.07}} \right) \times {10^{15}}$	${190.60}_{- 5.20}^{+ 5.30}$ $190.60_{ - 5.20}^{ + 5.30}$	${2.48}_{- 0.08}^{+ 0.07}$ $2.48_{ - 0.08}^{ + 0.07}$	${9.74}_{- 0.03}^{+ 0.03}$ $9.74_{ - 0.03}^{ + 0.03}$	${0.42}_{- 0.02}^{+ 0.02}$ $0.42_{ - 0.02}^{ + 0.02}$
¹³CH₃CN	5	78–257	$({4.71}_{- 1.30}^{+ 1.73}) \times 10^{15}$ $\left( {4.71_{ - 1.30}^{ + 1.73}} \right) \times {10^{15}}$	${170.60}_{- 18.59}^{+ 15.50}$ $170.60_{ - 18.59}^{ + 15.50}$	${2.11}_{- 0.09}^{+ 0.11}$ $2.11_{ - 0.09}^{ + 0.11}$	${9.62}_{- 0.04}^{+ 0.03}$ $9.62_{ - 0.04}^{ + 0.03}$	${0.06}_{- 0.01}^{+ 0.01}$ $0.06_{ - 0.01}^{ + 0.01}$
CH₃C¹⁵N	3	78–335	$({4.64}_{- 0.78}^{+ 0.95}) \times 10^{14}$ $\left( {4.64_{ - 0.78}^{ + 0.95}} \right) \times {10^{14}}$	${242.55}_{- 35.53}^{+ 37.25}$ $242.55_{ - 35.53}^{ + 37.25}$	${2.77}_{- 0.38}^{+ 0.83}$ $2.77_{ - 0.38}^{ + 0.83}$	${9.27}_{- 0.18}^{+ 0.17}$ $9.27_{ - 0.18}^{ + 0.17}$	${0.43}_{- 0.12}^{+ 0.04}$ $0.43_{ - 0.12}^{ + 0.04}$

COMs with T_ex = 177.6K, FWHM = 2.17km s⁻¹, v_LSR = 9.67 km s⁻¹ and s = 0.08″

CH₃OH	18	56–946	$({4.66}_{- 0.18}^{+ 0.16}) \times 10^{18}$ $\left( {4.66_{ - 0.18}^{ + 0.16}} \right) \times {10^{18}}$
CH₃OH^a	7	657–946	$({1.60}_{- 0.07}^{+ 0.06}) \times 10^{19}$ $\left( {1.60_{ - 0.07}^{ + 0.06}} \right) \times {10^{19}}$
¹³CH₃OH	3	162–254	$({4.97}_{- 0.27}^{+ 0.30}) \times 10^{17}$ $\left( {4.97_{ - 0.27}^{ + 0.30}} \right) \times {10^{17}}$
CH₃¹⁸OH	9	33–96	$({9.94}_{- 0.49}^{+ 0.49}) \times 10^{16}$ $\left( {9.94_{ - 0.49}^{ + 0.49}} \right) \times {10^{16}}$
CH₂DOH	9	49–352	$({1.08}_{- 0.06}^{+ 0.07}) \times 10^{18}$ $\left( {1.08_{ - 0.06}^{ + 0.07}} \right) \times {10^{18}}$
CH₂DOH^b	6	49–352	$({2.81}_{- 0.17}^{+ 0.19}) \times 10^{18}$ $\left( {2.81_{ - 0.17}^{ + 0.19}} \right) \times {10^{18}}$
CH₃CHO	27	65–387	$({8.04}_{- 0.17}^{+ 0.18}) \times 10^{16}$ $\left( {8.04_{ - 0.17}^{ + 0.18}} \right) \times {10^{16}}$
CH₃OCH₃	8	81–253	$({3.41}_{- 0.10}^{+ 0.11}) \times 10^{17}$ $\left( {3.41_{ - 0.10}^{ + 0.11}} \right) \times {10^{17}}$
CH₃OCHO	34	106–412	$({5.05}_{- 0.11}^{+ 0.11}) \times 10^{17}$ $\left( {5.05_{ - 0.11}^{ + 0.11}} \right) \times {10^{17}}$
CH₃COCH₃	13	111–116	$({1.10}_{- 0.07}^{+ 0.07}) \times 10^{17}$ $\left( {1.10_{ - 0.07}^{ + 0.07}} \right) \times {10^{17}}$
C₂H₅OH	24	24–464	$({3.39}_{- 0.12}^{+ 0.12}) \times 10^{17}$ $\left( {3.39_{ - 0.12}^{ + 0.12}} \right) \times {10^{17}}$
C₂H₅CN	20	147–368	$({8.84}_{- 0.23}^{+ 0.22}) \times 10^{15}$ $\left( {8.84_{ - 0.23}^{ + 0.22}} \right) \times {10^{15}}$
¹³CH₃CN	5	78–257	$({2.73}_{- 0.12}^{+ 0.11}) \times 10^{15}$ $\left( {2.73_{ - 0.12}^{ + 0.11}} \right) \times {10^{15}}$
CH₃C¹⁵N	3	78–335	$({1.15}_{- 0.15}^{+ 0.16}) \times 10^{15}$ $\left( {1.15_{ - 0.15}^{ + 0.16}} \right) \times {10^{15}}$

Notes. The top part of the table shows the results from the runs with all parameters left free, and the bottom part when fixing the T_ex, FWHM, v_LSR, and s to the median values obtained from the all-free runs. The uncertainties listed in each column only represent the statistical uncertainties from the fitting procedure. For CH₃ OH we include the results obtained using only the high excitation lines (flagged with ^a), and for CH₂DOH we include the results obtained using only the lines with the lowest opacities (flagged with ^b). The second and third columns are the number of transitions used in the fit and their E_up range.

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