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Home All issues Volume 696 (April 2025) A&A, 696 (2025) A147 Full HTML
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Table 1

Gas composition results: detections and upper limits.

Species Mult. factor(1) Mixing ratio Col. dens. (cm−2)
C2H6 1.05 ± 0.1 (1.35 ± 0.15) × 10−5 at 30−12+33$\[30_{-12}^{+33}\]$ km (1.05 ± 0.1) × 1017
C2H2 (LTE)(2) N/A (3.7 ± 0.2) × 10−6 at 32 km (2.0 ± 0.12) × 1016
N/A (5.8 ± 0.4) × 10−6 at 100 km
N/A (11.0 ± 0.8) × 10−6 at 200 km
C2H2 (NLTE)(3) 1.0 2.2 × 10−6 at 30 km 3.7 × 1016
C2H4 <4 <3.4 × 10−7 at 30−12+17$\[30_{-12}^{+17}\]$ km <4.6 × 1016
CH3C2H 0.105 ± 0.01 (4.6 ± 0.5) × 10−8 at 55−30+80$\[55_{-30}^{+80}\]$ km (3.7 ± 0.4) × 1014
C3H8 <0.2 <1.2 × 10−6 at 55−38+77$\[55_{-38}^{+77}\]$ km <4.5 × 1015
C4H2 0.22 ± 0.2 (1.1 ± 0.1) × 10−8 at 30−7+14$\[30_{-7}^{+14}\]$ km (2.1 ± 0.2) × 1013
C6H6 <50 <3.0 × 10−9 at 27−5+11$\[27_{-5}^{+11}\]$ km <7.2 × 1014
CO2 <500 <1.3 × 10−9 at 31−14+44$\[31_{-14}^{+44}\]$ km <8.4 × 1012
HCN <2 <9.3 × 10−9 at 35−14+35$\[35_{-14}^{+35}\]$ km <3.1 × 1014
HC3N <2 <3.6 × 10−9 at 35−14+32$\[35_{-14}^{+32}\]$ km <3.0 × 1013

Notes. (1)Multiplicative factor from the Lavvas et al. (2021) model. For undetected species, “<f” indicates that the MIRI data are consistent with at most f times the Lavvas et al. (2021) model. (2)Slope profile. See text for details. (3)Fixed abundance profile. See text for details.

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