First light of the VLT planet finder SPHERE - I. Detection and characterization of the substellar companion GJ 758 B

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Table 2

Observing log.

UT date	Julian date	Filter pair	DIT^a× NDIT	Dithering^b	T_exp	FoV rot.	Seeing^c	Sr^c
	(day)		(s)		(min)	(deg)	(as)	(%)

2014-08-13	2 456 882	J23	32 × 3	4 × 4	25.6	7.1	0.50 ± 0.06	74 ± 4
2014-08-13	2 456 882	H23	32 × 3	4 × 4	25.6	7.2	0.58 ± 0.06	85 ± 2

2014-08-14	2 456 883	Y23	32 × 3	4 × 4	25.6	7.1	0.50 ± 0.11	58 ± 6
2014-08-14	2 456 883	K12	32 × 3	4 × 4	25.6	7.2	0.44 ± 0.05	89 ± 1

Notes.

^(a)

Detector integration time.

^(b)

Detector dithering (see text for details). NDIT images are acquired at each detector dithering position.

^(c)

The seeing and Strehl ratio estimations are calculated over periods of 10 s every 30 s by the real-time computer. The Strehl ratio is expressed in the mean wavelength of the considered filter pair. The error bar is calculated as the standard deviation of the values.

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