NIRPS tightens the mass estimate of GJ 3090 b and detects a planet near the stellar rotation period

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Volume 706 (February 2026)

A&A, 706 (2026) A278

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Table A.2

Priors and posteriors of the transit fit

Parameter	Description	Prior	Posterior	Units
Keplerian Parameters
GJ 3090 b
P	Orbital period	𝒩(2.853,0.010)	$2 . 85310198_{- 0.00000085}^{+ 0.0000080}$ $2.85310198_{-0.00000085}^{+0.0000080}$	days
t₀	Time of conjunction	𝒩(1356.153,0.010)	$1356 . 15312_{- 0.00026}^{+ 0.00027}$ $1356.15312_{-0.00026}^{+0.00027}$	BJD-2457000
r₁	−	𝒰(0,1)	0.798 ± 0.014	−
r₂=p	Scaled planetary radius R_p/R_*	𝒰(0,1)	$0 . 03853_{- 0.00047}^{+ 0.00050}$ $0.03853_{-0.00047}^{+0.00050}$	−
b	Impact parameter	−	$0 . 698_{- 0.021}^{+ 0.020}$ $0.698_{-0.021}^{+0.020}$	−
i	Inclination	−	$86 . 93_{- 0.18}^{+ 0.16}$ $86.93_{-0.18}^{+0.16}$	deg
e	Eccentricity	−	0 (fixed)	−
ω	argument of periastron	−	90 (fixed)	deg
Stellar Parameters
q₁	Limb darkening coeff	𝒩(0.8453,0.022)	$0 . 848_{- 0.022}^{+ 0.021}$ $0.848_{-0.022}^{+0.021}$	−
q₂	Limb darkening coeff	𝒩(0.4177,0.021)	$0 . 417_{- 0.020}^{+ 0.019}$ $0.417_{-0.020}^{+0.019}$	−
ρ	Stellar density	𝒩(5205,428)	$5178_{- 407}^{+ 404}$ $5178_{-407}^{+404}$	g/cm⁻³
Gaussian Process Parameters
ρ_{GP,TESS_S2}	GP Characteristic timescale	log 𝒰(0.001, 50.0)	$0 . 199_{- 0.016}^{+ 0.018}$ $0.199_{-0.016}^{+0.018}$	days
σ_{GP,TESS_S2}	GP Amplitude	log 𝒰(10⁻⁶, 50.0)	$5 . 03_{- 0.32}^{+ 0.35} \times 10^{- 4}$ $5.03_{-0.32}^{+0.35} \times 10^{-4}$	−
ρ_{GP,TESS_S3}	GP Characteristic timescale	log 𝒰(0.001,50.0)	$0 . 333_{- 0.052}^{+ 0.078}$ $0.333_{-0.052}^{+0.078}$	days
σ_{GP,TESS_S3}	GP Amplitude	log 𝒰(10⁻⁶, 50.0)	$6 . 69_{- 0.70}^{+ 0.91} \times 10^{- 4}$ $6.69_{-0.70}^{+0.91} \times 10^{-4}$	−
ρ_{GP,TESS_S29}	GP Characteristic timescale	log 𝒰(0.001,50.0)	$0 . 435_{- 0.077}^{+ 0.101}$ $0.435_{-0.077}^{+0.101}$	days
σ_{GP,TESS_S29}	GP Amplitude	log 𝒰(10⁻⁶, 50.0)	$4 . 31_{- 0.46}^{+ 0.61} \times 10^{- 4}$ $4.31_{-0.46}^{+0.61} \times 10^{-4}$	−
ρ_{GP,TESS_S69}	GP Characteristic timescale	log 𝒰(0.001,50.0)	$380_{- 0.041}^{+ 0.048}$ $380_{-0.041}^{+0.048}$	days
σ_{GP,TESS_S69}	GP Amplitude	log 𝒰(10⁻⁶, 50.0)	$8 . 54_{- 0.83}^{+ 1.09} \times 10^{- 4}$ $8.54_{-0.83}^{+1.09} \times 10^{-4}$	−
Instrument Offsets and Jitters
M_{TESS_S2}	Offset relative flux	𝒩(0.0,0.03)	$- 0 . 3_{- 6.3}^{+ 6.7} \times 10^{- 5}$ $-0.3_{-6.3}^{+6.7} \times 10^{-5}$	−
σ_{w,TESS_S2}	Jitter	log 𝒰(0.01,300.0)	$0 . 7_{- 0.7}^{+ 8.5}$ $0.7_{-0.7}^{+8.5}$	ppm
M_{TESS_S3}	Offset relative flux	𝒩(0.0,0.03)	$- 0 . 8_{- 14}^{+ 13} \times 10^{- 5}$ $-0.8_{-14}^{+13} \times 10^{-5}$	−
σ_{w,TESS_S3}	Jitter	log 𝒰(0.01,300.0)	$0 . 6_{- 0.6}^{+ 9.5}$ $0.6_{-0.6}^{+9.5}$	ppm
M_{TESS_S29}	Offset relative flux	𝒩(0.0,0.03)	$- 0 . 9_{- 9}^{+ 10} \times 10^{- 5}$ $-0.9_{-9}^{+10} \times 10^{-5}$	−
σ_{w,TESS_S29}	Jitter	log 𝒰(0.01,300.0)	$179_{- 31}^{+ 24}$ $179_{-31}^{+24}$	ppm
M_{TESS_S69}	Offset relative flux	𝒩(0.0,0.03)	−15 ± 17 × 10⁻⁵	−
σ_{w,TESS_S69}	Jitter	log 𝒰(0.01,300.0)	$2 . 1_{- 2.1}^{+ 41.8}$ $2.1_{-2.1}^{+41.8}$	ppm

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