WASP-4b transit observations with GROND | Astronomy & Astrophysics (A&A)

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Volume 539 (March 2012)

A&A, 539 (2012) A159

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Table 3

System parameters of the WASP-4 system derived from the light curve analysis.

Parameter		Value	68.3% Conf. limits	Unit	Comment

– Light curve fit –
Planet-to-star size ratio	p = R_p/R_∗	0.15655	0.00028	–	1
Orbital inclination	i	88.57	0.45	deg	1
Normalized semimajor axis	a/R_∗	5.455	0.031	–	1
Transit impact parameter	b = (a/R_∗)cosi	0.136	0.043	–	1
Reduced chi-square		1.005	–	–	1

– Planetary parameters –
Radius	R_p	1.413	0.020	R_Jup	2
Semimajor axis	a	0.02300	0.00036	AU	2
Mean density	ρ_p	0.582	0.036	ρ_Jup	2
Surface gravity	g_p	15.36	0.91	m s^-2	2
Transit duration	t_D	2.1696	0.0047	h	1
Ingress/egress	t_ing/egr	0.3014	0.0039	h	1

– Stellar parameters –
Mean density	ρ_∗	1.715	0.029	g cm^-3	1
g′ Linear limb-darkening coefficient	u ₁	0.616	0.046	–	1
g′ Quadratic limb-darkening coefficient	u₂	0.211	0.060	–	1
r′ Linear limb-darkening coefficient	u₁	0.427	0.044	–	1
r′ Quadratic limb-darkening coefficient	u₂	0.303	0.064	–	1
i′ Linear limb-darkening coefficient	u₁	0.292	0.047	–	1
i′ Quadratic limb-darkening coefficient	u₂	0.304	0.060	–	1
z′ Linear limb-darkening coefficient	u₁	0.241	0.045	–	1
z′ Quadratic limb-darkening coefficient	u₂	0.386	0.063	–	1

Notes. (1) Based on the analysis of the multiband light curves presented in this work; (2) values obtained using (1) and results for the M_∗, R_∗, T_eff and M_p from Winn et al. (2009) and Sanchis-Ojeda et al. (2011).

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