Refined physical properties and g′, r′, i′, z′, J, H, K transmission spectrum of WASP-23b from the ground

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Table 1

Instrumental and observational settings used to obtain data for WASP-23 (median values), during the observation on UT February 25, 2012.

GROND	Gain	d _ring ^a	Max count	Background^b
band	(ADU)	(pixel)	(ADU) × 10³	(ADU) × 10³

g ′	1.45	57	18.6	0.3
r ′	1.33	67	43.8	0.3
i ′	1.62	51	27.2	0.3
z ′	1.74	48	22.3	0.4
J	2.39	9	26.7	5.0
H	2.65	6	18.2	17.0
K	2.55	24	13.1	11.0

Notes.

^(a)

Diameter of the defocussed PSF ring in pixels.

^(b)

Measured using an annulus, centered on the stellar PSF, encompassing an area four times larger than the area used to produce a photometric measurement of the stellar PSF.

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