Photochemistry of atomic oxygen green and red-doublet emissions in comets at larger heliocentric distances

Susarla Raghuram; Anil Bhardwaj

doi:10.1051/0004-6361/201321921

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Volume 566 (June 2014)

A&A, 566 (2014) A134

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Table 2

Calculated percentage contributions for major production processes of O(¹S) and O(¹D) in different comets.

Production processes of O(¹S) and O(¹D) at three cometocentric projected distances (km) (%)
Comet	hν + H₂O			hν + CO₂			hν + CO			O(¹S) → O(¹D)			e + H₂O⁺			e + CO
	10²	10³	10⁴	10²	10³	10⁴	10²	10³	10⁴	10²	10³	10⁴	10²	10³	10⁴	10²	10³	10⁴

116P/Wild 4	43	33	25	33	25	20	9	7	5				5	15	22	5	15	17
	(83)^*	(71)	(59)	(3)	(2)	(2)	(0.5)	(0.5)	(0.5)	(8)	(9)	(9)	(4)	(14)	(22)	(0.1)	(0.7)	(2)
C/2003 K4 (LINEAR)	46	42	32	35	32	25	11	11	9				1	4	13	1	5	14
	(88)	(83)	(71)	(3)	(3)	(2)	(1)	(1)	(1)	(7)	(8)	(9)	(0.5)	(3)	(13)	(0.5)	(0.5)	(1)
C/2007 Q3 (Siding Spring)	35	29	21	46	37	28	4	3	2				2	18	17	4	15	23
	(82)	(73)	(60)	(4)	(4)	(3)	(0.5)	(0.5)	(0.5)	(9)	(10)	(11)	(2)	(9)	(20)	(0.5)	(2)	(3)
C/2006 W3 (Christensen)	18	15	11	55	47	37	17	15	11				0.5	3	8	3	15	28
	(69)	(61)	(48)	(9)	(8)	(7)	(3)	(2)	(2)	(15)	(16)	(17)	(1)	(6)	(15)	(0.5)	(3)	(5)
C/2009 P1 (Garradd)	22	17	14	41	32	28	22	17	15				3	9	13	8	20	23
	(71)	(58)	(47)	(6)	(5)	(4)	(3)	(3)	(2)	(13)	(14)	(13)	(4)	(14)	(19)	(1)	(3)	(3)
C/2001 Q4 (NEAT)	11	9	7	63	50	40	11	9	7				1	4	6	7	23	34
	(57)	(47)	(37)	(13)	(11)	(9)	(2)	(2)	(2)	(21)	(22)	(22)	(2)	(8)	(14)	(1)	(5)	(8)
Comet X^**	8	6	5	63	47	41	8	6	5				1	3	5	12	30	37
	(48)	(38)	(31)	(15)	(12)	(10)	(2)	(1)	(1)	(23)	(25)	(24)	(3)	(10)	(13)	(3)	(8)	(10)

Notes.

^(*)

The values in parentheses are for O(¹D);

^(**)

comet X is a hypothetical comet similar to the observational condition of comet NEAT and having equal gas production rates of H₂O, CO₂, and CO; hν = photon; e = thermal electron.

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