Chemical evolution during the formation of a protoplanetary disk

Open Access

Table 2

Classification of molecules according to their spatial distributions.

Component	Molecules with the highest gas-phase abundances	Molecules with the highest total (gas + solid) abundances
Spiral arms only	CH₅⁺, H₃⁺	CH₃^(‡), CH₅⁺, H₃⁺, HCO^(‡), OH^(‡), NH, NH₂

Spiral arms + transition region	c-C₃H, C₂H₇⁺, C₄H, CCH, HCO⁺, l-C₃H, N₂H⁺, NH₂, O₂, PCH₃⁺	c-C₃H, c-C₃H₂, C₂H₇⁺, C₄H, CCH, CCS, CH₂OH, CH₃^(‡), CH₃O, CH₃S, CN, HCO^(‡), HCO⁺, HCS, HNO^(‡), l-C₃H, l-C₃H₂, N₂H⁺, O₂, OH^(‡), PCH₃⁺

Transition region only	c-C₃H₂, CCS, CH₂OH, CH₃^†, CH₃O, CH₃S, CN, HCO^(‡), HCS, l-C₃H₂, OH

Inner disk (with or without the transition region)	C₃H₈, CH₂NH, CH₃CCH, CH₃CHO, CH₃CN, CH₃COCH₃, CH₃NH₂, CH₃OCH₃, CH₃OH, CH₃SH, CO₂, CP, CS, H₂CCO, H₂CO, H₂CS, H₂O, H₂S, H₂S₃, H₅C₂O₂⁺, HC₃N, HCl, HCN, HCO^(‡), HCOOCH₃, HCOOH, HCP, HCSi, HF, HNC, HNCO, HNO, HOOH, HSO, N₂O, NH, NH₂CH₂OH, NH₂CHO, NH₃, NO, NS, OCS, SiC₄H, SiC₆H, SiC₈H, SiH₄, SiO, SO, SO₂	H₅ C₂O₂⁺, HNO^(‡), N₂O, SO^(‡), SO₂^(‡)

All regions	CH₃^(‡), CH₄, CO, N₂, P, PN, PO	C₃H₈, CH₂NH, CH₃CCH, CH₃CHO, CH₃CN, CH₃COCH₃, CH₃NH₂, CH₃OCH₃, CH₃OH, CH₃SH, CH₄, CO, CO₂, CP, CS, H₂CCO, H₂CO, H₂CS, H₂O, H₂S, H₂S₃, HC₃N, HCl, HCN, HCOOCH₃, HCOOH, HCP, HCSi, HF, HNC, HNCO, HOOH, HSO, N₂, NH₂CH₂OH, NH₂CHO, NH₃, NO, NS, OCS, P, PN, PO, SiC₄H, SiC₆H, SiC₈H, SiH₄, SiO, SO^(‡), SO₂^(‡)

Notes. We consider that the variation of abundance between two components is significant when the abundances change by at least an order of magnitude. ^(‡) These species appear in two categories, as their spatial distribution is sensitive to the chosen set of initial abundances.

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