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Table 4
Model parameters for the L 98-59 three-planet system.
| Three-planet model plus GP | Three-planet model plus an | |
|---|---|---|
| activity model trained on Hα | untrained GP activity model | |
ln Bayesian evidence,  |
− 411.5 | − 410.3 |
| Systemic velocity, γ0 (m s−1) | − 5678.4 ± 0.2 | − 5678.3 ± 0.3 |
| GP hyperparameters | ||
| Covariance amplitude, a (m s−1) |  |
 |
| Exponential timescale, λ (days) |  |
 |
| Coherence, Γ |  |
 |
| Periodic timescale, PGP (days) |  |
 |
| Additive jitter, s (m s−1) |  |
 |
| Measured parameters | ||
| L 98-59b (TOI-175.03) | ||
| Orbital period, Pb (days) | 2.2531 ± 0.0004 | |
| Time of mid-transit, T0,b [BJD-2 457 000] | 1366.1708 ± 0.0001 | |
| Semi-amplitude, Kb (m s−1)* | <1.06 | <1.07 |
 |
0.03 ± 0.22 | − 0.07 ± 0.24 |
 |
− 0.01 ± 0.22 | − 0.06 ± 0.26 |
| L 98-59c (TOI-175.01) | ||
| Orbital period, Pc (days) | 3.6904 ± 0.0003 | |
| Time of mid-transit, T0,c [BJD-2 457 000] | 1367.2752 ± 0.0006 | |
| Semi-amplitude, Kc (m s−1) | 2.21 ± 0.28 | 2.13 ± 0.32 |
 |
0.08 ± 0.15 | − 0.05 ± 0.16 |
 |
0.01 ± 0.19 | 0.04 ± 0.22 |
| L 98-59d (TOI-175.02) | ||
| Orbital period, Pd (days) | 7.4512 ± 0.0007 | |
| Time of mid-transit, T0,d [BJD-2 457 000] | 1362.7376 ± 0.0009 | |
| Semi-amplitude, Kd (m s−1) | 1.67 ± 0.31 | 1.59 ± 0.38 |
 |
− 0.04 ± 0.20 | 0.02 ± 0.18 |
 |
0.08 ± 0.25 | − 0.01 ± 0.23 |
| Derived parameters | ||
| L 98-59b (TOI-175.03) | ||
| Semi-major axis, ab (AU) | 0.02282 ± 0.00008 | |
| Equilibrium temperature, Teq,b (K) | ||
| Bond albedo = 0 | 610 ± 13 | |
| Bond albedo = 0.3 | 558 ± 12 | |
| Planet radius, rp,b (R⊕) (†) | 0.80 ± 0.05 | |
| Planet mass, mp,b (M⊕) (*) | <1.01 | <1.01 |
| Bulk density, ρb (g cm−3) (*) | <12.7 | <13.1 |
| Surface gravity, gb (m s−2) (*) | <16.1 | <17.1 |
| Escape velocity, vesc,b (km s−1) (*) | <14.3 | <14.7 |
| Eccentricity, eb (‡) | <0.12 | <0.15 |
| L 98-59c (TOI-175.01) | ||
| Semi-major axis, ac (AU) | 0.0317 ± 0.0001 | |
| Equilibrium temperature, Teq,c (K) | ||
| Bond albedo = 0 | 517 ± 11 | |
| Bond albedo = 0.3 | 473 ± 10 | |
| Planet radius, rp,c (R⊕) (†) | 1.35 ± 0.07 | |
| Planet mass, mp,c (M⊕) |  |
 |
| Bulk density, ρc (g cm−3) |  |
 |
| Surface gravity, gc (m s−2) |  |
 |
| Escape velocity, vesc,c (km s−1) | 15.0 ± 1.1 | 14.8 ± 1.2 |
| Eccentricity, ec (‡) | < 0.07 | < 0.07 |
| L 98-59d (TOI-175.02) | ||
| Semi-major axis, ad (AU) | 0.0506 ± 0.0002 | |
| Equilibrium temperature, Teq,d (K) | ||
| Bond albedo = 0 | 409 ± 8 | |
| Bond albedo = 0.3 | 374 ± 8 | |
| Planet radius, rp,d (R⊕) (†) | 1.57 ± 0.14 | |
| Planet mass, mp,d (M⊕) |  |
 |
| Bulk density, ρd (g cm−3) |  |
 |
| Surface gravity, gd (m s−2) |  |
 |
| Escape velocity, vesc,d (km s−1) | 13.6 ± 1.5 |  |
| Eccentricity, ed (‡) | <0.09 | <0.08 |
Notes. (*) Upper limit given by the 95% confidence interval. (†)Planetary radii from K19. (‡)Upper limit given by the 95% confidence interval derived from the joint RV and dynamical stability analyses.
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