Transit spectrophotometry of the exoplanet HD 189733b - I. Searching for water but finding haze with HST NICMOS

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Volume 505 / No 2 (October II 2009)

A&A, 505 2 (2009) 891-899

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Table 2:

System parameters of HD 189733b.
Parameter	Individual NICMOS Fits		Joint HST & Spitzer $^\dagger$
	F166N filter	F187N filter	F166N filter	F187N filter
central wavelength, $\lambda$ ( $\mu$ m)	1.6607	1.8748
wavelength range, $\Delta\lambda$ ( $\mu$ m)	0.0170	0.0191
planet-to-star radius contrast, $R_{\rm pl}$ / $R_{\star }$	0.15464 $\pm$ 0.00051	0.15496 $\pm$ 0.00028	$0.15498\pm0.00035$	$0.15517\pm0.00019$
inclination, i (deg)	85.75 $\pm$ 0.13	85.715 $\pm$ 0.076	85.723 $\pm$ 0.024 $^\dagger$
system scale, a/ $R_{\star }$	8.871 $\pm$ 0.095	8.854 $\pm$ 0.062	8.898 $\pm$ 0.027 $^\dagger$
impact parameter, $b=a\cos i$ / $R_{\star }$	0.657 $\pm$ 0.021	0.661 $\pm$ 0.013	0.6x636 $\pm$ 0.0031 $^\dagger$
stellar density, $\rho_{\star}$ (g cm^-3)	2.684 $\pm$ 0.086	2.669 $\pm$ 0.056	2.709 $\pm$ 0.025 $^\dagger$
linear limb-darkening coefficient, c₂	2.195 $\pm$ 0.058	1.972 $\pm$ 0.029	2.1483	1.9508

$^\dagger$ System parameter values and 1- $\sigma$ error derived from the weighted mean using: Pont et al. (2007) HST/ACS, Désert et al. (2009a,b) Spitzer/IRAC, Knutson et al. (2009) Spitzer/IRAC, and the individual fits of this work HST/NICMOS. The mean value was adopted for the fits.

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