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 7

Best-fit parameters obtained for OO Ser assuming a source size of 0.155″.

Species	n_lines	E_up (K)	N (cm⁻²)	T_ex (K)	FWHM (km s⁻¹)	v_LSR (km s⁻¹)
COMs with FWHM = 2.0 km s⁻¹ and v_LSR = 9.25 km s⁻¹

CH₃OH	8	56–746	$({2.52}_{- 0.11}^{+ 0.11}) \times 10^{17}$ ${\left( {2.52_{ - 0.11}^{ + 0.11}} \right) \times {{10}^{17}}}$	${158.70}_{- 5.44}^{+ 9.40}$ ${158.70_{ - 5.44}^{ + 9.40}}$
CH₃CHO	14	65–351	$({6.39}_{- 0.46}^{+ 0.64}) \times 10^{15}$ ${\left( {6.39_{ - 0.46}^{ + 0.64}} \right) \times {{10}^{15}}}$	${142.40}_{- 11.80}^{+ 15.00}$ ${142.40_{ - 11.80}^{ + 15.00}}$
CH₃OCH₃	4	81	$({3.00}_{- 0.68}^{+ 0.70}) \times 10^{16}$ ${\left( {3.00_{ - 0.68}^{ + 0.70}} \right) \times {{10}^{16}}}$	${174.35}_{- 25.25}^{+ 22.31}$ ${174.35_{ - 25.25}^{ + 22.31}}$
CH₃OCHO	7	106–312	$({3.89}_{- 0.18}^{+ 0.29}) \times 10^{16}$ ${\left( {3.89_{ - 0.18}^{ + 0.29}} \right) \times {{10}^{16}}}$	${150.90}_{- 6.80}^{+ 11.80}$ ${150.90_{ - 6.80}^{ + 11.80}}$
CH₃COCH₃	8	115	$({1.95}_{- 0.59}^{+ 0.73}) \times 10^{16}$ ${\left( {1.95_{ - 0.59}^{ + 0.73}} \right) \times {{10}^{16}}}$	${151.60}_{- 19.57}^{+ 20.70}$ ${151.60_{ - 19.57}^{ + 20.70}}$

COMs with T_ex = 151.6 K, FWHM = 2.0 km s⁻¹ and v_LSR = 9.25 km s⁻¹

CH₃OH	8	56–746	$({2.54}_{- 0.08}^{+ 0.08}) \times 10^{17}$ $\left( {2.54_{ - 0.08}^{ + 0.08}} \right) \times {10^{17}}$
CH₃CHO	14	65–351	$({6.58}_{- 0.32}^{+ 0.28}) \times 10^{15}$ $\left( {6.58_{ - 0.32}^{ + 0.28}} \right) \times {10^{15}}$
CH₃OCH₃	4	81	$({2.35}_{- 0.10}^{+ 0.11}) \times 10^{16}$ $\left( {2.35_{ - 0.10}^{ + 0.11}} \right) \times {10^{16}}$
CH₃OCHO	7	106–312	$({3.17}_{- 0.15}^{+ 0.15}) \times 10^{16}$ $\left( {3.17_{ - 0.15}^{ + 0.15}} \right) \times {10^{16}}$
CH₃COCH₃	8	115	$({1.97}_{- 0.12}^{+ 0.12}) \times 10^{16}$ $\left( {1.97_{ - 0.12}^{ + 0.12}} \right) \times {10^{16}}$

Notes. In the case of a single value of E_up, when n_lines > 1 it means that those lines are all within 1 K of each other.source size and T_ex. Thus, we estimated their column densities following two approaches.

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