Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE

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Table 1

Observing log.

UT date	Instr. mode	IRDIS filter	IFS band	IRDIS DIT^a	IFS DIT^a	T_exp ^b	Field Rot.^c	Sr^d
				(s, #)	(s, #)	(min)	(deg)

2015-09-25	IRDIFS_EXT	K12	YH	16 × 256	16 × 256	68.3	41.66	0.80–0.90
2015-09-26	IRDIFS	H	YJ	4 × 918	64 × 64	68.3	43.64	0.80–0.90
2015-12-26	IRDIFS	H23	YJ	16 × 256	32 × 128	68.3 (34.7^b)	37.19	0.75–0.85
2016-01-16	IRDIFS	H23	YJ	16 × 256	64 × 64	68.3	41.76	0.75–0.90

Notes.

^(a)

Detector integration time.

^(b)

Exposure time after bad frame removal; about half the frames are unusable.

^(c)

All observation were centered on the meridian passage of the target with an airmass between 1.08 and 1.10.

^(d)

Strehl ratio measured at 1.6 μm as measured by AO system.

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