Open Access

Table B.3

Production rates in C/2021 A1 in November-December 2021 (weekly average).

UT date (mm/dd.d) Molecule rh (au) Production rate (×1025 molecules s−1) Lines (a)
13-16 November average

11/15.8 HCN 1.17 3.0 ± 0.1 1
11/15.8 HNCd(b) 1.17 <0.44 1
11/14.8 CH3CN 1.18 0.9 ± 0.3 (8)
11/14.8 H2S 1.18 <11.5 (1)
11/14.8 CS 1.18 2.2 ± 0.5 1
11/14.8 H2COd 1.18 7.0 ± 3.7 (1)
11/15.3 CH3OH 1.17 39 ± 9 2+(23)

08-13 December average

12/10.8 HCN 0.79 3.4 ± 0.1 2
12/12.8 H13CN 0.77 <0.072 1
12/12.8 HC15N 0.77 <0.047 1
12/10.8 HNCd(b) 0.79 0.24 ± 0.02 1
12/12.5 CH3CN 0.77 0.62 ± 0.03 19+(6)
12/12.4 HC3N 0.78 0.14 ± 0.05 (8)
12/12.4 NH2CHO 0.78 0.91 ± 0.08 8+(27)
12/12.5 HNCO 0.78 2.95 ± 0.30 6+(6)
12/11.2 H2S 0.79 5.9 ± 0.7 1+(1)
12/12.0 CS 0.78 2.9 ± 0.1 2
CSd(c) 0.78 4.1 ± 0.1 2
12/13.1 C34S 0.77 0.15 ± 0.05 1
12/12.4 SO 0.78 <0.6 (5)
SOd(d) 0.78 <1.5 (5)
12/12.4 SO2 0.78 <1.6 (20)
12/12.4 OCS 0.78 4.3 ± 1.1 (6)
12/12.4 H2CS 0.78 <0.8 (5)
12/12.0 H2CO 0.78 5.0 ± 0.2 4+(2)
H2COd(e) 0.78 10.2 ± 0.5 4+(2)
12/12.5 CO 0.77 <78 (1)
12/12.4 HCOOH 0.78 7.6 ± 0.9 (28)
12/11.6 CH3OH 0.78 35 ± 1 42+(14)
12/12.4 CH3CHO 0.78 1.5 ± 0.3 (53)
12/12.4 (CH2OH)2 0.78 5.3 ± 1.3 (39)
12/12.0 HCOOCH3 0.78 <5.8 (6)
12/12.4 CH2OHCHO 0.78 2.0 ± 0.5 1+(10)
12/12.4 C2H5OH 0.78 7.3 ± 1.5 (84)
12/12.4 CH2CO 0.78 1.3 ± 0.6 (10)
12/11.6 CH3SH 0.79 <3.2 (32)
12/10.6 PH3 0.80 <6.4 (1)
12/11.6 c-C3H2 0.80 <0.9 (11)
12/11.6 l-C3H2 0.80 <0.2 (13)

Notes. Subscript “d” has been added to the molecules for which a daughter Haser density profile is assumed with the parent scale length provided below.

(a)Number of lines used for the determination of Q, in parentheses the number of lines that are not individually detected.

(b) Where we assume that HNC is produced in the coma with a Haser parent scale length of 1000 km and 500 km in December (Cordiner et al. 2017).

(c) Assuming a parent scale length of 1000 km (about 4× longer than the photo-dissociation scale length of CS2, assumed parent otherwise).

(d) Assuming a parent scale length of 1700 km (SO2).

(e)Where we assume that H2CO is produced in the coma with a Haser parent scale length of 2800 km in November and 1500 km in December.

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