Competing chemical signatures in the atmosphere of TOI-270 d: Inference of sulfur and carbon chemistry

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Volume 701 (September 2025)

A&A, 701 (2025) A296

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Table 1

Priors and posteriors for the broadband MCMC light curve fit of the NIRspec BOTS G395H and NIRISS SOSS data, as shown in Fig. 1.

Parameters	NIRSpec		NIRISS
Parameters	Prior	Broadband fit	Prior	Broadband fit
TOI-270 d
t₀ (BJD)	U(60221.26,60221.41)	60221.3017 ± 2 . 10⁻⁵	U(60346.43,60346.53)	60346.478015 ± 3.5 . 10⁻⁵
R_p>/R_*	U(0.04,0.06)	${0.053987}_{- 0.000074}^{+ 0.000067}$ $0.053987^{+0.000067}_{-0.000074}$	Same as NIRSpec	0.05362 ± 0.00013
a/R_*	U(40, 44)	${42.73}_{- 0.25}^{+ 0.37}$ $42.73^{+0.37}_{-0.25}$	Same as NIRSpec	${42.33}_{- 0.52}^{+ 0.67}$ $42.33^{+0.67}_{-0.52}$
i (deg)	G(89.73,0.16)	${89.833}_{- 0.084}^{+ 0.078}$ $89.833^{+0.078}_{-0.084}$	Same as NIRSpec	89.75 ± 0.12

TOI-270 b
t₀ (BJD)	U(60221.16,60221.31)	60221.2401 ± 3.5 . 10⁻⁵	–	–
R_p/R_*	U(0.02,0.04)	0.0315356 ± 9.9 . 10⁻⁵	–	–
a/R_*	U(16, 20)	${18.79}_{- 0.45}^{+ 0.58}$ $18.79^{+0.58}_{-0.45}$	–	–
i (deg)	G(89.39,0.37)	${89.19}_{- 0.34}^{+ 0.31}$ $89.19^{+0.31}_{-0.34}$	–	–

Other parameters
u₁	G(0.037,0.050)	0.104 ± 0.019	G(0.096,0.090)	0.125 ± 0.025
u₂	G(0.130,0.065)	0.126 ± 0.031	G(0.252,0.115)	0.180 ± 0.041
v (day⁻¹)	U(−0.1,0.1)	−0.000913 ± 3.9 . 10⁻⁵	Same as NIRSpec	−0.000329 ± 7.1 . 10⁻⁵
c	U(0.99,1.01)	1.0000976 ± 5.4 . 10⁻⁶	Same as NIRSpec	1.0000339 ± 8.2 . 10⁻⁶
σ s (ppm)	U(0, 10⁶)	73.0 ± 2.2	Same as NIRSpec	112.0 ± 3.0

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