Herschel measurements of the D/H and 16O/18O ratios in water in the Oort-cloud comet C/2009 P1 (Garradd)

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Volume 544 (August 2012)

A&A, 544 (2012) L15

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Table 1

HIFI observations of C/2009 P1 (Garradd) on 6 October 2011.

	Line	ν	Mode	Date^a	Line area^b	Δv	Production rateⁱ
							T_law T_kin = 25 K T_kin = 47 K
		(GHz)		(Oct. UT)	(mK km s^-1)	(m s^-1)	(s^-1)

HDO	1₁₀–1₀₁	509.29242	Single-point	6.428^c	22.5 ± 2.0	–59 ± 33	9.8( ± 0.9)9.2( ± 0.9)7.7( ± 0.6) × 10²⁵
	1₁₀–1₀₁	547.67644	Single-point	6.415^d	179 ± 5	–21 ± 13	4.55( ± 0.12)4.97( ± 0.12)3.94( ± 0.11) × 10²⁶
H₂O	1₁₀–1₀₁	556.93600	Single-point	6.415^d	9318 ± 12	320 ± 2	23.8( ± 0.6)23.4( ± 0.6)16.5( ± 0.4) × 10²⁸
H₂O	1₁₀–1₀₁	556.93600	Mapping	6.291^e	8897 ± 98^h	331 ± 20^h	23.2( ± 1.6)26.2( ± 4.0)20.8( ± 5.5) × 10²⁸
H₂O	1₁₀–1₀₁	556.93600	Mapping	6.559^f	8109 ± 82^h	293 ± 16^h	21.4( ± 1.8)24.1( ± 3.7)19.2( ± 5.0) × 10²⁸
H₂O	2₀₂–1₁₁	987.92676	Mapping	6.597^g	7140 ± 198^h	21 ± 19^h	18.2( ± 1.0)20.6( ± 2.1)15.5( ± 2.8) × 10²⁸

Notes. Spectra characteristics and production rates.

^(a)

Mean date.

^(b)

Average of HRS and WBS line area retrievals in main-beam brightness-temperature scale T_mB. The error bar corresponds to statistical noise, which is multiplied by 1.5 for single-point observations observed in FSW mode to account for uncertainties in the baseline removal.

^(c)

Herschel observation identification number (Obsid) 1342230#, with # = 187, 189, 191, 193, 195, 197, 199, 201, 203, and 205.

^(d)

Obsid: # = 186, 188, 190, 192, 194, 196, 198, 200, 202, and 204.

^(e)

Obsid: #185.

^(f)

Obsid: #206.

^(g)

Obsid: #209.

^(h)

From the average of spectra within 10′′ of the peak brightness.

⁽ⁱ⁾

For single-point data, a 4′′ beam offset is considered (Appendix A). For mapping data, the production rate corresponds to the weighted mean of apparent production rates measured over the whole map, and the error bar is the dispersion around the mean.

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