New perspectives on MASCARA-1b: A combined analysis of pre- and post-eclipse emission data using CRIRES+

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Volume 695 (March 2025)

A&A, 695 (2025) A110

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Table F.1

C/O ratios for hot and/or ultra-hot Jupiters included in Fig. 10 with constrained abundances of C- and O-bearing species from ground-based high-resolution measurements.

Planet	Planet Mass [MJ]	C/O ratio	Instrument [retrieval framework]	Reference
HD 189733b	1.13±0.08	0.3±0.1	KPIC [free-retrieval]	Finnerty et al. (2024)
HIP 65A b	3.213±0.078	${0.72}_{- 0.30}^{+ 0.13}$ $0.72_{ - 0.30}^{ + 0.13}$	IGRINS [chemical eq.]	Bazinet et al. (2024)
MASCARA-1b	3.7±0.9	${0.68}_{- 0.22}^{+ 0.12}$ ${0.68_{ - 0.22}^{ + 0.12}}$ (pre)	CRIRES+ [chemical eq.]	Ramkumar et al. (2023)
		${0.75}_{- 0.17}^{+ 0.11}$ ${0.75_{ - 0.17}^{ + 0.11}{\rm{}}}$ (post)	CRIRES+ [chemical eq.]	This work
		${0.74}_{- 0.14}^{+ 0.10}$ $0.74_{ - 0.14}^{ + 0.10}{\rm{}}$ (pre+post)	CRIRES+ [chemical eq.]	This work
WASP-18b^(a)	10.4296±0.69	${0.75}_{- 0.17}^{+ 0.14}$ $0.75_{ - 0.17}^{ + 0.14}$	IGRINS [free-retrieval]	Brogi et al. (2023)
WASP-33b	2.093±0.139	${0.8}_{- 0.2}^{+ 0.1}$ $0.8_{ - 0.2}^{ + 0.1}$	KPIC [free-retrieval]	Finnerty et al. (2023)
WASP-43b	1.998±0.079	0.78±0.09	CRIRES+ [chem eq.]	Lesjak et al. (2023)
WASP-76b	${0.894}_{- 0.013}^{+ 0.014}$ $0.894_{ - 0.013}^{ + 0.014}$	${0.59}_{- 0.14}^{+ 0.13}$ $0.59_{ - 0.14}^{ + 0.13}$	IGRINS [grid retrieval]	Weiner Mansfield et al. (2024)
		0.94±0.39	SPIRou [free-retrieval]	Hood et al. (2024)
WASP-77Ab	1.76±0.06	0.59±0.08	IGRINS [free-retrieval]	Line et al. (2021)
WASP-121b	1.157±0.070	${0.73}_{- 0.08}^{+ 0.07}$ $0.73_{ - 0.08}^{ + 0.07}$	CRIRES+ & ESPRESSO [chem eq.]	Pelletier et al. (2025)
		${0.70}_{- 0.10}^{+ 0.07}$ $0.70_{ - 0.10}^{ + 0.07}$	IGRINS [chemical eq.]	Smith et al. (2024b)
WASP-127b^(b)	${1.647}_{- 0.0172}^{+ 0.0214}$ $1.647_{ - 0.0172}^{ + 0.0214}$	${0.56}_{- 0.07}^{+ 0.05}$ $0.56_{ - 0.07}^{ + 0.05}$	CRIRES+ [chemical eq.]	Nortmann et al. (2025)
		${0.34}_{- 0.09}^{+ 0.08}$ $0.34_{ - 0.09}^{ + 0.08}$ (c)	IGRINS [grid retrieval]	(Kanumalla et al. 2024)
WASP-189b	${1.99}_{- 0.14}^{+ 0.16}$ $1.99_{ - 0.14}^{ + 0.16}$	${0.32}_{- 0.14}^{+ 0.41}$ $0.32_{ - 0.14}^{ + 0.41}$	CRIRES+ [chemical eq.]	Lesjak et al. (2025)

Notes. ^(a) We include the free-retrieval-based derived value since the authors only reported an upper limit on the C/O ratio retrieved assuming RCTE grid retrievals.^(b) We note that there is a C/O measurement for WASP-127b from RCPE grid retrievals using IGRINS (e.g. Kanumalla et al. 2024), but it is not included here as the authors reported only an upper limit. ^(c) Although the authors report a bounded value using RCTE grid retrievals, they emphasise in their study that their main conclusions are drawn from the RCPE grid retrievals, which provided an upper limit on the C/O ratio (< 0.68). As such, we include the bounded value for completeness.

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