Anatomy of the Class I protostar L1489 IRS with NOEMA - II. A disk replenished by a massive streamer

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Volume 703 (November 2025)

A&A, 703 (2025) A244

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Table 3

Summary of radiative transfer model results on the streamer.

Species	N_tot	T_ex	T_kin	$n_{{p-H}_{2}}$ ${n_{{\rm{p - }}{{\rm{H}}_2}}}$	Abundance X	Method
	(cm ⁻²)	(K)	(K)	(10⁵ cm ⁻³)
C₂H	(1.83 ± 0.56) × 10¹⁴	${7.3}_{- 1.5}^{+ 1.3}$ $7.3_{ - 1.5}^{ + 1.3}$	–	–	–	HFS fitting
	$({2.18}_{- 0.27}^{+ 0.31}) \times 10^{14}$ $\left( {2.18_{ - 0.27}^{ + 0.31}} \right) \times {10^{14}}$	6.6^(a)	${7.3}_{- 0.7}^{+ 1.3}$ $7.3_{ - 0.7}^{ + 1.3}$	≥1.31	≤1.09 × 10⁻⁷	MCMC `RADEX`

o-c-C₃H₂	$({3.44}_{- 0.95}^{+ 1.41}) \times 10^{12}$ $\left( {3.44_{ - 0.95}^{ + 1.41}} \right) \times {10^{12}}$	${7.8}_{- 1.0}^{+ 1.4}$ $7.8_{ - 1.0}^{ + 1.4}$	–	–	–	Rotational diagram
	$({3.28}_{- 0.28}^{+ 0.33}) \times 10^{12}$ $\left( {3.28_{ - 0.28}^{ + 0.33}} \right) \times {10^{12}}$	10.1^(a)	${12.4}_{- 2.3}^{+ 4.0}$ $12.4_{ - 2.3}^{ + 4.0}$	≥3.77	≤5.48 × 10⁻¹⁰	MCMC `RADEX`

HC₃N	(3.25 ± 1.09) × 10¹³	6.1 ± 0.5	–	–	–	Rotational diagram on 30m lines
	$({3.05}_{- 1.04}^{+ 1.89}) \times 10^{13}$ $\left( {3.05_{ - 1.04}^{ + 1.89}} \right) \times {10^{13}}$	6.3^(b)	${6.8}_{- 0.6}^{+ 1.0}$ $6.8_{ - 0.6}^{ + 1.0}$	≥1.99	≤1.42 × 10⁻⁸	MCMC `RADEX` on 30 m lines
	(2.39 ± 0.99) × 10¹³	6.3	–	–	–	Using Eq. (6) and T_ex = 6.3 K for NOEMA’s line

Notes. ^(a) Averaged on all levels from the best RADEX model. ^(b) J = 11 − 10 level from the best RADEX model.

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