Table 6
Orbital parameters for the XO-2N and XO-2S systems. Errors and upper limits refer to 1σ uncertainties.
| Parameter | XO-2Nb | XO-2Nc* | XO-2Sb | XO-2Sc | Note |
|
|
|||||
| P [days] | 2.61585922 ± 2.8 × 10-7 | ≥17 years | 18.157 ± 0.034 | 120.80 ± 0.34 | fitted |
| K [m s-1] | 90.17 ± 0.82 | ≥20 | 20.64 ± 0.85 | 57.68 ± 0.69 | fitted |
| K·P-2 [ m s-1 day-2] | – | −5.13 ± 0.54 × 10-7 | – | – | derived |
|
– | – | −0.314 |
−0.388 |
fitted |
|
– | – | 0.282 |
−0.038 |
fitted |
| ecosω |
|
– | – | – | fitted |
| esinω |
|
– | – | – | fitted |
| e | <0.006 | – | 0.180 ± 0.035 |
|
derived |
| ω [deg] | unconstrained | – | 311.9 ± 9.5 | 264.5 ± 4.9 | derived |
| Tc [BJDTDB–2 450 000] | 5565.546480 ± 5.4 × 10-5 | – | 6413.11 |
6408.1 |
fitted |
| γHDS [ m s-1] | −17.3 ± 2.0 | – | – | – | fitted |
| γHIRES [ m s-1] | −13.5 ± 2.9 | – | – | – | fitted |
| γHARPS − N [ m s-1] | 46932.9 ± 1.7 | – | 46 543 ± 1 | fitted | |
| jitterHDS [ m s-1] | <1.2 | – | – | – | fitted |
| jitterHIRES [ m s-1] |
|
– | – | – | fitted |
| jitterHARPS − N [m s-1] | 2.6 ± 0.7 | – | 1.80 ± 0.43 | fitted | |
 [ m s-1 day-1] |
0.0017 ± 0.0018 | – | 0.0531 ± 0.0087 | fitted | |
[m s-1 day-2]
|
−2.03 ± 0.21 × 10-5 | – | – | – | fitted |
| Msini [MJup] | 0.597 ± 0.021 a | ≥1.8 | 0.259 ± 0.014 | 1.370 ± 0.053 | derived |
| Radius R [RJup] | 1.019 ± 0.031 | – | – | – | derived |
| Density ρ [gcm-3] |
|
– | – | – | derived |
| Surface gravity log g [cgs] | 3.15 ± 0.03 | – | – | – | derived |
| a [AU] | 0.0367 3 ± 0.00064 | – | 0.1344 ± 0.0025 | 0.4756 ± 0.0087 | derived |
Notes.The results for XO-2Nb are discussed in Sect. 5.1, while those for the XO-2S planets are taken from Desidera et al. (2014). We also include our estimates of a few parameters for a second companion to XO-2N, namely XO-2Nc, although its existence is a matter of debate, as discussed in Sect. 5.1.1.
See Sect. 5.1.1 for our discussion about the existence of this companion.
For XO-2Nb this corresponds to the real mass of the planet. It was obtained with a Monte Carlo analysis using the median values of the orbital period and inclination angle of the orbital plane listed in Table 5, the stellar mass in Table 2 (second value), and the amplitude K of the radial velocity included in this table.
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