JOYS+: The link between the ice and gas of complex organic molecules - Comparing JWST and ALMA data of two low-mass protostars

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Volume 690 (October 2024)

A&A, 690 (2024) A205

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Table G.1

Inferred range of crystallization temperature of COM ices under laboratory conditions (T_crystal,lab). All the considered lab spectra of the five COM ices are obtained from the LIDA database (Rocha et al. 2022).

	pure ices		mixed ices^a

Species	measured T_lab (K)^b	T_{crystal, lab} (K)	measured T_lab (K)^b	T_{crystal, lab} (K)	fit B1-c (K)^c
CH₃CHO	15, 30, 70, 90, 110, 120	70–90	15, 30, 70, 90, 110, 120, 140, 160	110–140	all^d

C₂H₅OH	15, 30, 70, 100, 120, 130, 140, 150	100–120	15, 30, 70, 100, 120, 130, 140, 150, 160	100–160	all^d

CH₃OCH₃	15, 30, 70, 90, 100	30^e–70	15, 30, 70, 90, 100, 120, 140, 160	100–140	< 100–120

CH₃OCHO	15, 30, 50, 80, 100, 120	80–100	15, 30, 50, 80, 100, 120	50–80^f	< 100

CH₃COCH₃	15, 30, 70, 90, 110, 120, 130, 140	90–110	15, 30, 70, 90, 100, 110, 120, 140, 160	100–140	< 90

^a The mixing constituents are provided in the legends of Figs. 5 and C.1.

^b In experiments, temperature is usually sampled at small intervals (e.g., 1 K), but only a small part of the spectra measured at certain temperatures are provided on databases.

^c The range of T_lab in which the lab spectra can fit into the B1-c spectrum, as long as there is no anti-correlation.

^d The changes in the band profiles around crystallization are small; therefore, it is hard to exclude the crystalline features when compared with observations.

^e The lower limit of T_{crystal, lab} of pure CH₃OCH₃ ice is likely higher than 30 K.

^f For CH₃OCHO, the T_{crystal, lab} of mixed ice is lower than that of pure ice. This is likely due to the crystallization or desorption of CO and H₂CO, not the crystallization of CH₃OCHO itself.

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