ROSINA ion zoo at Comet 67P | Astronomy & Astrophysics (A&A)

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Volume 642 (October 2020)

A&A, 642 (2020) A27

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Table 1

Compilation of the ions predicted and detected at comets as a function of the mass.

	Previous works (see caption)		This work

u q⁻¹	Identified species	Predicted species	Detected species in HR	Peaks in LR but not in HR
		(from modelling)		(new candidate)
13	CH⁺	¹³C⁺, CH⁺	CH⁺
14		N⁺, ¹³CH⁺, CH	CH
15		NH⁺, ¹³CH, CH	CH
16		O⁺, NH, ¹³CH, CH	O⁺, NH, CH
17	HO⁺	HO⁺, NH, ¹³CH, CH	HO⁺, NH
18	H₂O⁺	H₂O⁺, NH	H₂O⁺, NH
19	H₃O⁺	H₃O⁺	H₃O⁺
20		H₂¹⁸O⁺, H₃¹⁷O⁺, H₂DO⁺	H₂ ¹⁸O⁺, H₂DO⁺
21		H₃ ¹⁸O⁺	H₃ ¹⁸O⁺
22				✓(CO)
23			Na⁺
24		C		✓
25		C₂H⁺		✓
26	CN⁺	CN⁺, C₂H	C₂H
27		HCN⁺, C₂H	C₂H
28	CO⁺, N	CO⁺, N, HCNH⁺, C₂H	Si⁺*, CO⁺, HCNH⁺, C₂H
29	HCO⁺	HCO⁺, N₂H⁺, C₂H	HCO⁺, C₂H
30		NO⁺, H₂CO⁺, CH₂NH, C₂H		✓
31		HNO⁺, H₂COH⁺	P⁺*, H₂COH⁺
32		S⁺, O, CH₃OH⁺	S⁺, O*, CH₃OH⁺
33		HS⁺, HO, CH₃OH	CH₃OH
34	H₂S⁺	³⁴S⁺, H₂S⁺, ¹³CH₃OH		✓
35		H₃S⁺		✓
36		H₂ ³⁴S⁺, H₃ ³³S⁺, C		✗
37		C₃H⁺, H₃O H₂O⁺		✓
38		C₂N⁺, C₃H		✓
39		C₃H	K⁺
40	Ca⁺	CHCN⁺, C₃H		✓

Notes. “Identified species” are those detected by UV, IR, visible or radio spectroscopic ground-based observations of comets (Delsemme 1985, 1991; Lis et al. 1997, see Sect. 1). “Predicted species” are those included in photochemical models for 1P/Halley (Huebner et al. 1991; Haider & Bhardwaj 2005) or considered as dominant for the corresponding mass (Balsiger et al. 1995). “Detected species in HR” refers to those detected with ROSINA-DFMS for this study. “Peaks in LR but not in HR” refers to peaks detected in LR (✓), (✗) otherwise, while no peaks were present in HR with a strong candidate in parenthesis (see Sect. 4.4). * means for Si⁺, P⁺, and O that, although a peak is located at the correct mass, it is seen once or twice in one of the two channels only, which may cast some doubt on their presence.

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