Table 1: Fitted and derived parameters for the HD 17156 system, host star and transiting planet. See Sect. 4.2. for a description of the fitted parameters.
MCMC fitted parameters  
D $0.00605^{\rm +0.00041}_{-0.00051}$
K [m s-1] $272.6^{\rm + 4.5}_{-4.2}$
b $0.591^{\rm + 0.088}_{-0.191}$
W [phase] $0.00626^{\rm + 0.00015}_{-0.00016}$
P [days] $21.21747^{\rm + 0.00070}_{-0.00067}$
$T_{\rm tr}$ [BJD] $2\,454\,438.48271^{\rm +0.00077}_{-0.00057}$
e $0.6719^{\rm + 0.0052}_{-0.0063}$
$\omega_0$ [$^\circ$] $121.14^{\rm + 0.76}_{-0.89}$
Deduced transit parameters  
p = $R_{\rm p}/R_{\star}$ $0.0777^{\rm + 0.0026}_{-0.0034}$
$r_{\star} = R_{\star} /a$ $0.0476^{\rm + 0.0045}_{-0.0058}$
$r_{\rm p} = R_{\rm p} /a$ $0.00371^{\rm + 0.00047}_{-0.00059}$
Deduced stellar radius$^\ast$  
$R_{\star}$ [$R_\odot$] $1.63^{\rm + 0.17}_{-0.20}$
Deduced planetary parameters  
$M_{\rm p}$ [ $M_{\rm Jup}$] $3.09^{\rm + 0.22}_{-0.17}$
$R_{\rm p}$ [ $R_{\rm Jup}$] $1.23 ^{\rm + 0.17}_{-0.20}$
$\rho_{\rm p}$ [ $\rho_{\rm Jup}$] $1.66^{\rm +1.37}_{-0.60}$
Deduced orbital parameters  
a [AU] $0.1589^{\rm + 0.0054}_{-0.0044}$
i [$^\circ$] $85.4^{\rm + 1.9}_{-1.2}$
Probability of secondary eclipse $0.04039 \%$
$^\ast$ The value for the stellar mass was kept fixed to the one presented
in Fischer et al. (2007): $1.2 \pm 0.1~M_{\odot}$.


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