The TOI-2427 system: Two close-in planets orbiting a late K-dwarf star

Open Access

Table 3

Model parameters of the transit and RV joint analysis of TOI-2427 b and c.

Parameter	Prior^(a)	Derived value
TOI-2427 b’s model parameters
Orbital period P_orb (d)	$U [1.30, 1.31]$ $\mathcal{U}[1.30, 1.31]$	${1.305962}_{- 0.000070}^{+ 0.00071}$ $1.305962_{-0.000070}^{+0.00071}$
Mid-time of reference transit T₀ (BJD_TDB−2 450 000)	$U [9169.61, 9169.63]$ $\mathcal{U}[9169.61, 9169.63]$	${9169.61992}_{- 0.00083}^{+ 0.0008}$ $9169.61992_{-0.00083}^{+0.0008}$
Planet-to-star radius ratio R_b/R_*	$U [0.00, 0.05]$ $\mathcal{U}[0.00, 0.05]$	0.0232 ± 0.0012
Impact parameter b_b	$U [0, 1]$ $\mathcal{U}[0, 1]$	${0.854}_{- 0.036}^{+ 0.026}$ $0.854_{-0.036}^{+0.026}$
$\sqrt{e} \sin ω_{⋆, b}$ $\sqrt{e} \sin \omega_{\star, \mathrm{b}}$	$U [- 1, 1]$ $\mathcal{U}[-1, 1]$	${0.18}_{- 0.21}^{+ 0.17}$ $0.18_{-0.21}^{+0.17}$
$\sqrt{e} \cos ω_{⋆, b}$ $\sqrt{e} \cos \omega_{\star, \mathrm{b}}$	$U [- 1, 1]$ $\mathcal{U}[-1, 1]$	${0.01}_{- 0.18}^{+ 0.17}$ $0.01_{-0.18}^{+0.17}$
Radial velocity semi-amplitude K_b (ms⁻¹)	$U [0, 50]$ $\mathcal{U}[0, 50]$	4.47 ± 0.39
TOI-2427 c’s model parameters
Orbital period P_orb (d)	$U [5.05, 5.25]$ $\mathcal{U}[5.05, 5.25]$	5.150 ± 0.011
Time of inferior conjunction T₀ (BJD_TDB−2 450 000)	$U [9471.29, 9474.29]$ $\mathcal{U}[9471.29, 9474.29]$	9472.75 ± 0.22
$\sqrt{e} \sin ω_{⋆, c}$ $\sqrt{e} \sin \omega_{\star, \mathrm{c}}$	$U [- 1, 1]$ $\mathcal{U}[-1, 1]$	−0.04 ± 0.26
$\sqrt{e} \cos ω_{⋆, c}$ $\sqrt{e} \cos \omega_{\star, \mathrm{c}}$	$U [- 1, 1]$ $\mathcal{U}[-1, 1]$	${0.00}_{- 0.25}^{+ 0.24}$ $0.00_{-0.25}^{+0.24}$
Radial velocity semi-amplitude K_c(ms⁻¹)	$U [0, 50]$ $\mathcal{U}[0, 50]$	${3.26}_{- 0.38}^{+ 0.39}$ $3.26_{-0.38}^{+0.39}$
Gaussian process (GP) model hyper-parameters and amplitudes
GP period P_GP (d)	$U [15, 40]$ $\mathcal{U}[15, 40]$	${28.14}_{- 0.52}^{+ 0.50}$ $28.14_{-0.52}^{+0.50}$
λ_p	$U [0.1, 5.0]$ $\mathcal{U}[0.1, 5.0]$	${0.61}_{- 0.10}^{+ 0.14}$ $0.61_{-0.10}^{+0.14}$
λ_e (d)	$U [1, 500]$ $\mathcal{U}[1, 500]$	${35.13}_{- 5.51}^{+ 6.97}$ $35.13_{-5.51}^{+6.97}$
$A_{R V} (m s^{- 1})$ $A_{\mathrm{RV}}\left(\mathrm{m} \mathrm{s}^{-1}\right)$	$U [0, 10]$ $\mathcal{U}[0, 10]$	${3.43}_{- 0.88}^{+ 1.55}$ $3.43_{-0.88}^{+1.55}$
B_RV (ms⁻¹ d)	$U [0, 100]$ $\mathcal{U}[0, 100]$	${18.4}_{- 4.9}^{+ 8.3}$ $18.4_{-4.9}^{+8.3}$
A_dLW (m²s⁻²)	$U [0, 70]$ $\mathcal{U}[0, 70]$	${18.61}_{- 4.75}^{+ 8.21}$ $18.61_{-4.75}^{+8.21}$
A_{Na D2}(Å)	$U [- 0.5, 0.5]$ $\mathcal{U}[-0.5, 0.5]$	$- {0.0059}_{- 0.0031}^{+ 0.0019}$ $-0.0059_{-0.0031}^{+0.0019}$
Other model parameters
Stellar mean density ρ_* (g cm⁻³)	$N [3.31, 0.40]$ $\mathcal{N}[3.31, 0.40]$	${3.36}_{- 0.42}^{+ 0.40}$ $3.36_{-0.42}^{+0.40}$
TESS parameterized limb-darkening coefficient q₁	$N [0.48, 0.10]$ $\mathcal{N}[0.48, 0.10]$	${0.47}_{- 0.11}^{+ 0.10}$ $0.47_{-0.11}^{+0.10}$
TESS parameterized limb-darkening coefficient q₂	$N [0.35, 0.10]$ $\mathcal{N}[0.35, 0.10]$	0.35 ± 0.10
HARPS RV offset (ms⁻¹)	$U [- 50, 50]$ $\mathcal{U}[-50, 50]$	$- {5.99}_{- 1.54}^{+ 1.70}$ $-5.99_{-1.54}^{+1.70}$
TESS jitter term σ_TESS (ppm)	$U [0, 1000]$ $\mathcal{U}[0, 1000]$	${60.8}_{- 42.4}^{+ 58.5}$ $60.8_{-42.4}^{+58.5}$
HARPS jitter term σ_{RV, HARPS} (ms⁻¹)	$U [0, 20]$ $\mathcal{U}[0, 20]$	2.15 ± 0.26
dLW jitter term σ_dLW (m²s⁻²)	$U [0, 20]$ $\mathcal{U}[0, 20]$	${0.69}_{- 0.63}^{+ 0.23}$ $0.69_{-0.63}^{+0.23}$
Na D 2 jitter term (Å) σ_NaD2	$U [0.0, 0.1]$ $\mathcal{U}[0.0, 0.1]$	${0.00051}_{- 0.00038}^{+ 0.00063}$ $0.00051_{-0.00038}^{+0.00063}$

Notes. The stellar mass, radius, and effective temperature listed in Table 1 were used as input parameters for jointly modeling the TESS detrended transit light curve and the HARPS measurements.^(a) $U [a, b]$ $\mathcal{U}[\mathrm{a}, \mathrm{b}]$ refers to uniform priors between a and b, whereas $N [a, b]$ $\mathcal{N}[\mathrm{a}, \mathrm{b}]$ to Gaussian priors with mean a and standard deviation b.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.