Probing methane in Uranus’ upper stratosphere using HST observations of the 1280 Å Raman feature

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Volume 705 (January 2026)

A&A, 705 (2026) A109

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Table 1

Parameters of methane profiles shown in Fig. 5.

$K_{z z}^{}$ $K_{zz}^$ [cm²/s ]	Lyα B [R]	Raman B [R]	z [km] (P [mbar]) for $τ_{abs}^{1216} = 0.1 - 1$ $\tau _{{\rm{abs}}}^{1216} = 0.1 - 1$ at SZA=0^◦	$n_{{CH}_{4}}$ ${n_{{\rm{C}}{{\rm{H}}_4}}}$ & $N_{{CH}_{4}}$ ${N_{{\rm{C}}{{\rm{H}}_4}}}$ at $τ_{abs}^{1216} = 1$ $\eqalign{ & \tau _{{\rm{abs}}}^{1216} = 0.1 - 1 \cr & \tau _{{\rm{abs}}}^{1216} = 1 \cr}$ [cm⁻³ & cm²]	z [km] (P [mbar]) where $n_{{CH}_{4}} ~ 1 {cm}^{- 3}$ ${n_{{\rm{C}}{{\rm{H}}_4}}}\~1\,{\rm{c}}{{\rm{m}}^{ - 3}}$	Remark
2430	710	13.16	297–259 (7.45e-2–1.58e-1)	3.35e10 & 5.3e16	∼520 (2.25e-3)	a
2150	713	14	292–257 (8.2e-2–1.65e-1)	3.2e10 & 4.87e16	∼515 (2.4e-3)	b
1130	728	20	275–239 (1.14e-2–2.43e-1)	3.8e10 & 5.2e16	∼480 (3.9e-3)	b
1040	731	21	272–237 (1.21e-2–2.54e-1)	3.82e10 & 5.13e16	∼478 (4e-3)	b
170	138	20	223–192 (3.47e-1–7.3e-1)	5.21e10 & 5.13e16	∼395 (1.37e-2)	c

Notes. $n_{{CH}_{4}}$ ${N_{{\rm{C}}{{\rm{H}}_4}}}$ represents methane column density. Remarks: (a) reference profile; (b) fit to observation; (c) fit to observation without considering resonant scattering. For these simulations, we employed the model atmosphere used to explain the 2011 HST STIS Lyα observations by Joshi et al. (2025), with minor adjustments. Further details are provided in Sect. 4.

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