WISE J061213.85-303612.5: a new T-dwarf binary candidate

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Table 2

Observing log.

Date	Target	Filter	Exp. time	Seeing^a	t ₀ ^a	Airmass	LGS mode^b	FWHM ^c	Strehl^d
			(s)	(arcsec)	(ms)			(arcsec)	(%)

2012-09-08	WISE 0612-3036	J	300	0.8	2.5	1.1	non-AO	–	–
		H	180	0.7	2.5	1.3	se	–	–
		K _s	420	0.7	3.0	1.2	non-AO	–	–
	WISE 2255-3118	H	780	1.3	1.1	1.0	se	0.50	2.1
		K _s	840	1.0	1.5	1.0	se	0.40	3.3
	WISE 2327-2730	H	660	0.9	1.7	1.3	se	0.37	3.2

2013-05-19	2MASS J1114-2618	J	480	0.9	1.5	1.2	tt	0.40	1.8
		H	480	0.9	2.0	1.1	tt	0.22	4.8
		K _s	480	0.9	2.0	1.1	tt	0.14	11.0
	WISE 1959-3338	J	600	0.9	2.0	1.0	tt	0.39	2.7
		H	400	0.9	1.7	1.0	tt	0.27	5.0
		K _s	300	0.8	2.0	1.0	tt	0.25	8.0

2013-07-01	WISE 1436-1814	H	240	1.1	4.0	1.0	se	0.53	2.3
		K _s	240	1.1	4.0	1.0	se	0.29	4.6
	WISE 1612-3420	H	900	1.0	4.0	1.0	non-AO	0.41	2.4
		K _s	800	1.0	4.0	1.0	non-AO	0.30	4.0

Notes.

^(a)

Average values from the Differential Image Motion Monitor (DIMM);

^(b)

se: seeing enhancer, tt: tip-tilt (see text for details);

^(c)

Full width at half maximum (FWHM) measured on the target;

^(d)

Strehl ratio measured on the target, except in the case of WISE 0612-3036, which is resolved into a tight binary system.

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