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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.

(a)

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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