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Table 2
Observed and derived parameters of the Keplerian two-planet LTT model for NN Ser.
| Parameter | Island solutions1 | Best fit2 |
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|
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| (a) Observed parameters: | ||
| Period Po (yr) | 15.482 ± 0.027 | 15.473 |
| Period Pi (yr) | 7.647 ± 0.058 | 7.653 |
| Period ratio | 2.025 ± 0.018 | 2.022 |
| Eccentricity eo | 0.142 ± 0.011 | 0.144 |
| Eccentricity ei | 0.223 ± 0.019 | 0.222 |
| LTT amplitude Kbin,o (s) | 27.65 ± 0.12 | 27.68 |
| LTT amplitude Kbin,i (s) | 4.32 ± 0.22 | 4.28 |
| Argument of periapse ωbin,o (°) | 317.0 ± 6.4 | 318.4 |
| Argument of periapse ωbin,i (°) | 48.0 ± 2.6 | 47.5 |
| χ2 for 109 degrees of freedom | < 97.9 | 95.56 |
| Periapse passage To (BJD) | 2 456 145 ± 80 | |
| Periapse passage Ti (BJD) | 2 454 406 ± 20 | |
| (b) Derived parameters: | ||
| Outer planet, semi-major axis ao (AU) | 5.389 ± 0.045 | 5.387 |
| Inner planet, semi-major axis ai (AU) | 3.358 ± 0.033 | 3.360 |
| Outer planet, mass Mo sin io (MJup) | 6.96 ± 0.12 | 6.97 |
| Inner planet, mass Mi sin ii (MJup) | 1.74 ± 0.09 | 1.73 |
Notes.
(1)
For the island of stability in the righthand panel of Fig. 3 with χ2 < 97.9 and τ > 106 yr, including the 1σ errors.
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