Free Access
Table 6
System parameters for WASP-68.
| General information | ||
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| RA (J2000) | 20 20 22.98 | |
| Dec (J2000) | –19 18 52.9 | |
| V | 10.7 | |
| K | 8.9 | |
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| Stellar parameters from spectroscopic analysis | ||
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| Teff (K) | 5910 ± 60 | |
| log g⋆ [cgs] | 4.17 ± 0.11 | |
| [Fe/H] | 0.22 ± 0.08 | |
| ξt (km s-1) | 1.4 ± 0.1 | |
| vmac (km s-1) | 2.6 ± 0.3 | |
| v sin i⋆ (km s-1) | 2.3 ± 0.8 | |
| Sp. type | G0 | |
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| Parameters from MCMC analyses | ||
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| Jump parameters | e ≥ 0 | e = 0 (adopted) |
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| Planet/star area ratio (Rp/R⋆)2 [%] | 0.57 ± 0.03 |
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| b′ = acosip/R⋆ [R⋆] |
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| Transit width W [d] |
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| T0 [HJDTDB] |
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| Orbital period P [d] | 5.084299 ± 0.000015 | 5.084298 ± 0.000015 |
| RV K2 [ms-1d1/3] | 168.2 ± 3.3 |
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| RV slope [ms-1y-1] | 14 ± 2 | 14 ± 2 |
cos ω |
|
0 (fixed) |
|
sin ω |
|
0 (fixed) |
| c 1,I + z | 0.79 ± 0.04 |
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| c 2,I + z | –0.31 ± 0.02 | −0.31 ± 0.03 |
| c 1, Ic | 0.84 ± 0.03 | 0.84 ± 0.02 |
| c 2, Ic | −0.29 ± 0.02 | −0.29 ± 0.02 |
| Effective temperature Teff[K]a | 5911 ± 60 |
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| Metallicity [Fe/H] [dex]a | 0.22 ± 0.08 | 0.22 ± 0.08 |
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| Deduced stellar parameters | ||
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| Mean density ρ⋆ [ρ⊙] |
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| Surface gravity log g⋆ [cgs] |
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| Mass M⋆ [M⊙] | 1.23 ± 0.03 | 1.24 ± 0.03 |
| Radius R⋆ [R⊙] |
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| Luminosity L⋆ [L⊙] |
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| u 1,I + z | 0.25 ± 0.02 |
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| u 2,I + z | 0.28 ± 0.01 | 0.28 ± 0.01 |
| u 1, Ic | 0.28 ± 0.01 | 0.28 ± 0.01 |
| u 2, Ic | 0.28 ± 0.01 | 0.28 ± 0.01 |
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| Deduced planet parameters | ||
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| RV K [ms-1] | 97.9 ± 1.9 | 97.9 ± 1.9 |
| Planet/star radius ratio Rp/R⋆ | 0.075 ± 0.002 | 0.075 ± 0.002 |
| btr [R⋆] |
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| boc [R⋆] |
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| Toc [HJDTDB] | 2456067.444 ± 0.029 | 2456067.406 ± 0.001 |
| Scaled semi-major axis a/R⋆ |
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| Orbital semi-major axis a [AU] |
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| Orbital inclination ip [deg] |
|
88.1 ± 1.3 |
| Orbital eccentricity e |  ,
< 0.063 (95 %) |
0 (fixed) |
| Argument of periastron ω [deg] |
|
– |
| Mean density ρp [ρJup] |
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| Surface gravity log gp [cgs] |
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| Mass Mp [MJup] | 0.95 ± 0.03 | 0.95 ± 0.03 |
| Radius Rp [RJup] |
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| Roche limit aR[AU]b |
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| a/aR |
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| Equilibrium temperature Teq[K]c |
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| Irradiation [erg s-1cm-2] |
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Notes. The values given for the parameters derived from our MCMC analyses are medians and 1σ limits of the marginalized posterior probability distributions.
(b)
Using aR = 2.46 Rp(M⋆/Mp)1/3 (Chandrasekhar 1987).
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