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 8

Best-fit parameters obtained for the small molecules.

Species	s and T_ex from COMs			s=2″ and T_ex=50K and 300K
Species	N (cm⁻²)	FWHM (km s⁻¹)	v_LSR (km s⁻¹)	N_50K (cm⁻²)	N_300K (cm⁻²)
L1551 IRS 5 North

H₂S	$({3.01}_{- 0.18}^{+ 0.20}) \times 10^{16}$ $\left( {3.01_{ - 0.18}^{ + 0.20}} \right) \times {10^{16}}$	${2.61}_{- 0.09}^{+ 0.09}$ $2.61_{ - 0.09}^{ + 0.09}$	${9.38}_{- 0.06}^{+ 0.05}$ $9.38_{ - 0.06}^{ + 0.05}$	$({1.96}_{- 0.22}^{+ 0.31}) \times 10^{16}$ $\left( {1.96_{ - 0.22}^{ + 0.31}} \right) \times {10^{16}}$	$({3.81}_{- 0.24}^{+ 0.22}) \times 10^{16}$ $\left( {3.81_{ - 0.24}^{ + 0.22}} \right) \times {10^{16}}$
DCN	$({5.00}_{- 0.35}^{+ 0.34}) \times 10^{14}$ $\left( {5.00_{ - 0.35}^{ + 0.34}} \right) \times {10^{14}}$	${2.61}_{- 0.12}^{+ 0.15}$ $2.61_{ - 0.12}^{ + 0.15}$	${9.68}_{- 0.06}^{+ 0.06}$ $9.68_{ - 0.06}^{ + 0.06}$	$({1.96}_{- 0.15}^{+ 0.18}) \times 10^{14}$ $\left( {1.96_{ - 0.15}^{ + 0.18}} \right) \times {10^{14}}$	$({6.53}_{- 0.35}^{+ 0.42}) \times 10^{14}$ $\left( {6.53_{ - 0.35}^{ + 0.42}} \right) \times {10^{14}}$
H₂CO	$({8.83}_{- 0.62}^{+ 0.62}) \times 10^{16}$ $\left( {8.83_{ - 0.62}^{ + 0.62}} \right) \times {10^{16}}$	${2.30}_{- 0.10}^{+ 0.11}$ $2.30_{ - 0.10}^{ + 0.11}$	${9.43}_{- 0.06}^{+ 0.06}$ $9.43_{ - 0.06}^{ + 0.06}$	$({1.38}_{- 0.11}^{+ 0.12}) \times 10^{17}$ $\left( {1.38_{ - 0.11}^{ + 0.12}} \right) \times {10^{17}}$	$({8.54}_{- 0.53}^{+ 0.61}) \times 10^{16}$ $\left( {8.54_{ - 0.53}^{ + 0.61}} \right) \times {10^{16}}$
D₂CO	$(\begin{array}{l} {2.77}_{- 0.20}^{+ 0.18} \end{array}) \times 10^{15}$ $\left( {\matrix{ {2.77_{ - 0.20}^{ + 0.18}} \hfill \cr } } \right) \times {10^{15}}$	${2.90}_{- 0.19}^{+ 0.14}$ $2.90_{ - 0.19}^{ + 0.14}$	${9.35}_{- 0.09}^{+ 0.07}$ $9.35_{ - 0.09}^{ + 0.07}$	$({6.57}_{- 0.52}^{+ 0.53}) \times 10^{14}$ $\left( {6.57_{ - 0.52}^{ + 0.53}} \right) \times {10^{14}}$	$({4.91}_{- 0.33}^{+ 0.32}) \times 10^{15}$ $\left( {4.91_{ - 0.33}^{ + 0.32}} \right) \times {10^{15}}$
OC³³S	$({2.65}_{- 0.35}^{+ 0.40}) \times 10^{15}$ $\left( {2.65_{ - 0.35}^{ + 0.40}} \right) \times {10^{15}}$	${2.04}_{- 0.20}^{+ 0.23}$ $2.04_{ - 0.20}^{ + 0.23}$	${9.35}_{- 0.13}^{+ 0.12}$ $9.35_{ - 0.13}^{ + 0.12}$	$({2.31}_{- 0.33}^{+ 0.35}) \times 10^{15}$ $\left( {2.31_{ - 0.33}^{ + 0.35}} \right) \times {10^{15}}$	$({2.52}_{- 0.33}^{+ 0.40}) \times 10^{15}$ $\left( {2.52_{ - 0.33}^{ + 0.40}} \right) \times {10^{15}}$
SO₂	$({1.24}_{- 0.14}^{+ 0.16}) \times 10^{16}$ $\left( {1.24_{ - 0.14}^{ + 0.16}} \right) \times {10^{16}}$	${2.42}_{- 0.26}^{+ 0.30}$ $2.42_{ - 0.26}^{ + 0.30}$	${9.10}_{- 0.12}^{+ 0.13}$ $9.10_{ - 0.12}^{ + 0.13}$	$({4.47}_{- 0.51}^{+ 0.56}) \times 10^{16}$ $\left( {4.47_{ - 0.51}^{ + 0.56}} \right) \times {10^{16}}$	$({1.04}_{- 0.11}^{+ 0.12}) \times 10^{16}$ $\left( {1.04_{ - 0.11}^{ + 0.12}} \right) \times {10^{16}}$

L1551 IRS 5 South

H₂S	$({10.00}_{- 0.78}^{+ 0.76}) \times 10^{16}$ $\left( {10.00_{ - 0.78}^{ + 0.76}} \right) \times {10^{16}}$	${3.08}_{- 0.14}^{+ 0.17}$ $3.08_{ - 0.14}^{ + 0.17}$	${4.12}_{- 0.06}^{+ 0.07}$ $4.12_{ - 0.06}^{ + 0.07}$	$({1.10}_{- 0.09}^{+ 0.09}) \times 10^{16}$ $\left( {1.10_{ - 0.09}^{ + 0.09}} \right) \times {10^{16}}$	$({2.85}_{- 0.17}^{+ 0.17}) \times 10^{16}$ $\left( {2.85_{ - 0.17}^{ + 0.17}} \right) \times {10^{16}}$

Haro 5a IRS

H₂S	$({1.21}_{- 0.14}^{+ 0.20}) \times 10^{16}$ ${\left( {1.21_{ - 0.14}^{ + 0.20}} \right) \times {{10}^{16}}}$	${4.09}_{- 0.58}^{+ 0.73}$ ${4.09_{ - 0.58}^{ + 0.73}}$	${13.63}_{- 0.24}^{+ 0.21}$ ${13.63_{ - 0.24}^{ + 0.21}}$	$({1.51}_{- 0.18}^{+ 0.20}) \times 10^{15}$ ${\left( {1.51_{ - 0.18}^{ + 0.20}} \right) \times {{10}^{15}}}$	$({5.26}_{- 0.81}^{+ 1.35}) \times 10^{15}$ ${\left( {5.26_{ - 0.81}^{ + 1.35}} \right) \times {{10}^{15}}}$
DCN	$({1.59}_{- 0.28}^{+ 0.32}) \times 10^{14}$ ${\left( {1.59_{ - 0.28}^{ + 0.32}} \right) \times {{10}^{14}}}$	${2.96}_{- 0.41}^{+ 1.23}$ ${2.96_{ - 0.41}^{ + 1.23}}$	${14.00}_{- 0.36}^{+ 0.27}$ ${14.00_{ - 0.36}^{ + 0.27}}$	$({1.38}_{- 0.27}^{+ 0.35}) \times 10^{13}$ ${\left( {1.38_{ - 0.27}^{ + 0.35}} \right) \times {{10}^{13}}}$	$({6.29}_{- 1.00}^{+ 1.19}) \times 10^{13}$ ${\left( {6.29_{ - 1.00}^{ + 1.19}} \right) \times {{10}^{13}}}$

V346 Nor

H₂S	$({7.89}_{- 0.36}^{+ 0.38}) \times 10^{16}$ $\left( {7.89_{ - 0.36}^{ + 0.38}} \right) \times {10^{16}}$	${5.24}_{- 0.14}^{+ 0.15}$ $5.24_{ - 0.14}^{ + 0.15}$	$- {4.33}_{- 0.09}^{+ 0.09}$ $- 4.33_{ - 0.09}^{ + 0.09}$	$({3.35}_{- 0.28}^{+ 0.35}) \times 10^{16}$ $\left( {3.35_{ - 0.28}^{ + 0.35}} \right) \times {10^{16}}$	$({6.56}_{- 0.30}^{+ 0.29}) \times 10^{16}$ $\left( {6.56_{ - 0.30}^{ + 0.29}} \right) \times {10^{16}}$
DCN	$({2.94}_{- 0.17}^{+ 0.17}) \times 10^{15}$ $\left( {2.94_{ - 0.17}^{ + 0.17}} \right) \times {10^{15}}$	${6.47}_{- 0.41}^{+ 0.59}$ $6.47_{ - 0.41}^{ + 0.59}$	$- {4.14}_{- 0.19}^{+ 0.19}$ $- 4.14_{ - 0.19}^{ + 0.19}$	$({1.41}_{- 0.25}^{+ 0.48}) \times 10^{15}$ $\left( {1.41_{ - 0.25}^{ + 0.48}} \right) \times {10^{15}}$	$({2.57}_{- 0.17}^{+ 0.17}) \times 10^{15}$ $\left( {2.57_{ - 0.17}^{ + 0.17}} \right) \times {10^{15}}$
H₂CO	$({1.98}_{- 0.12}^{+ 0.13}) \times 10^{17}$ $\left( {1.98_{ - 0.12}^{ + 0.13}} \right) \times {10^{17}}$	${6.57}_{- 0.31}^{+ 0.41}$ $6.57_{ - 0.31}^{ + 0.41}$	$- {4.52}_{- 0.16}^{+ 0.19}$ $- 4.52_{ - 0.16}^{ + 0.19}$	$({2.23}_{- 0.16}^{+ 0.17}) \times 10^{17}$ $\left( {2.23_{ - 0.16}^{ + 0.17}} \right) \times {10^{17}}$	$({1.53}_{- 0.10}^{+ 0.10}) \times 10^{17}$ $\left( {1.53_{ - 0.10}^{ + 0.10}} \right) \times {10^{17}}$
D₂CO	$({1.12}_{- 0.09}^{+ 0.09}) \times 10^{16}$ $\left( {1.12_{ - 0.09}^{ + 0.09}} \right) \times {10^{16}}$	${5.48}_{- 0.58}^{+ 0.68}$ $5.48_{ - 0.58}^{ + 0.68}$	$- {4.54}_{- 0.21}^{+ 0.18}$ $- 4.54_{ - 0.21}^{ + 0.18}$	$({1.57}_{- 0.11}^{+ 0.12}) \times 10^{15}$ $\left( {1.57_{ - 0.11}^{ + 0.12}} \right) \times {10^{15}}$	$({1.25}_{- 0.09}^{+ 0.09}) \times 10^{16}$ $\left( {1.25_{ - 0.09}^{ + 0.09}} \right) \times {10^{16}}$
SO₂	$({9.66}_{- 0.56}^{+ 0.54}) \times 10^{16}$ $\left( {9.66_{ - 0.56}^{ + 0.54}} \right) \times {10^{16}}$	${6.95}_{- 0.54}^{+ 0.36}$ $6.95_{ - 0.54}^{ + 0.36}$	$- {3.72}_{- 0.15}^{+ 0.26}$ $- 3.72_{ - 0.15}^{ + 0.26}$	$({3.53}_{- 0.23}^{+ 0.24}) \times 10^{17}$ $\left( {3.53_{ - 0.23}^{ + 0.24}} \right) \times {10^{17}}$	$({6.70}_{- 0.36}^{+ 0.35}) \times 10^{16}$ $\left( {6.70_{ - 0.36}^{ + 0.35}} \right) \times {10^{16}}$

OO Ser

H₂S	$({1.14}_{- 0.11}^{+ 0.12}) \times 10^{16}$ $\left( {1.14_{ - 0.11}^{ + 0.12}} \right) \times {10^{16}}$	${2.79}_{- 0.23}^{+ 0.32}$ $2.79_{ - 0.23}^{ + 0.32}$	${8.32}_{- 0.12}^{+ 0.08}$ $8.32_{ - 0.12}^{ + 0.08}$	$({4.03}_{- 0.43}^{+ 0.49}) \times 10^{15}$ $\left( {4.03_{ - 0.43}^{ + 0.49}} \right) \times {10^{15}}$	$({1.25}_{- 0.13}^{+ 0.14}) \times 10^{16}$ $\left( {1.25_{ - 0.13}^{ + 0.14}} \right) \times {10^{16}}$
DCN	$({3.51}_{- 0.26}^{+ 0.27}) \times 10^{14}$ $\left( {3.51_{ - 0.26}^{ + 0.27}} \right) \times {10^{14}}$	${2.52}_{- 0.14}^{+ 0.17}$ $2.52_{ - 0.14}^{ + 0.17}$	${9.51}_{- 0.07}^{+ 0.06}$ $9.51_{ - 0.07}^{ + 0.06}$	$({9.41}_{- 0.82}^{+ 0.81}) \times 10^{13}$ $\left( {9.41_{ - 0.82}^{ + 0.81}} \right) \times {10^{13}}$	$({3.82}_{- 0.31}^{+ 0.32}) \times 10^{14}$ $\left( {3.82_{ - 0.31}^{ + 0.32}} \right) \times {10^{14}}$
H₂CO	$({1.34}_{- 0.09}^{+ 0.09}) \times 10^{16}$ $\left( {1.34_{ - 0.09}^{ + 0.09}} \right) \times {10^{16}}$	${2.76}_{- 0.21}^{+ 0.15}$ $2.76_{ - 0.21}^{ + 0.15}$	${8.88}_{- 0.09}^{+ 0.09}$ $8.88_{ - 0.09}^{ + 0.09}$	$({1.40}_{- 0.09}^{+ 0.10}) \times 10^{16}$ $\left( {1.40_{ - 0.09}^{ + 0.10}} \right) \times {10^{16}}$	$({1.11}_{- 0.08}^{+ 0.08}) \times 10^{16}$ $\left( {1.11_{ - 0.08}^{ + 0.08}} \right) \times {10^{16}}$
D₂CO	$({1.30}_{- 0.17}^{+ 0.16}) \times 10^{15}$ $\left( {1.30_{ - 0.17}^{ + 0.16}} \right) \times {10^{15}}$	${2.72}_{- 0.37}^{+ 0.73}$ $2.72_{ - 0.37}^{ + 0.73}$	${9.72}_{- 0.11}^{+ 0.10}$ $9.72_{ - 0.11}^{ + 0.10}$	$({2.16}_{- 0.27}^{+ 0.29}) \times 10^{14}$ $\left( {2.16_{ - 0.27}^{ + 0.29}} \right) \times {10^{14}}$	$({1.82}_{- 0.22}^{+ 0.22}) \times 10^{15}$ $\left( {1.82_{ - 0.22}^{ + 0.22}} \right) \times {10^{15}}$
SO₂	$({1.59}_{- 0.17}^{+ 0.16}) \times 10^{16}$ $\left( {1.59_{ - 0.17}^{ + 0.16}} \right) \times {10^{16}}$	${2.57}_{- 0.31}^{+ 0.39}$ $2.57_{ - 0.31}^{ + 0.39}$	${9.43}_{- 0.11}^{+ 0.15}$ $9.43_{ - 0.11}^{ + 0.15}$	$({4.62}_{- 0.54}^{+ 0.59}) \times 10^{16}$ $\left( {4.62_{ - 0.54}^{ + 0.59}} \right) \times {10^{16}}$	$({1.06}_{- 0.12}^{+ 0.13}) \times 10^{16}$ $\left( {1.06_{ - 0.12}^{ + 0.13}} \right) \times {10^{16}}$

Notes. The second, third, and fourth columns were obtained using the same source size and T_ex as for the COMs. The fifth and sixth columns show the best-fit column densities assuming a source size of 2″, the FWHM and v_LSR of the third and fourth columns, and T_ex values of 50 K (fifth column) and 300 K (sixth column).

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