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Table 1

Journal of LIRIS imaging observations.

Object SpTa Filter Date Exp. time Seeing Ref.
(s) (′′)
S Ori 70b T5.5 H 2009 Dec. 15 9 × 28 × 10 1.57 11
C H4on 2009 Dec. 15 9 × 16 × 20 0.90
S Ori 73 C H4on 2009 Jan. 14 9 × 21 × 20 0.87 12
S Ori J053804.65−021352.5b H 2011 Dec. 31 9 × 12 × 15 1.50 13
C H4on 2011 Dec. 31 9 × 36 × 15 1.13
2MASS J072718.24+171001.2 T7.0 H 2011 Dec. 30 9 × 8 × 10 1.20 3
C H4on 2011 Dec. 30 9 × 8 × 10 1.20
2MASS J075547.95+221216.9 T5.0 H 2011 Dec. 30 9 × 8 × 10 1.23 3
C H4on 2011 Dec. 30 9 × 8 × 10 1.53
2MASS J075840.37+324724.5 T2.0 H 2011 Dec. 30 9 × 8 × 10 1.30 4
C H4on 2011 Dec. 30 9 × 8 × 10 1.50
2MASS J104753.85+212423.4 T6.5 H 2011 Dec. 31 9 × 6 × 15 1.25 1
C H4on 2011 Dec. 31 9 × 12 × 15 1.00
2MASS J110611.97+275422.5 T2.5 H 2011 Dec. 30 9 × 8 × 10 1.00 7
C H4on 2011 Dec. 30 9 × 8 × 10 0.90
2MASS J120747.17+024424.9 T0.0 H 2011 Dec. 30 9 × 16 × 10 1.80 2, 4
C H4on 2011 Dec. 30 9 × 8 × 10 1.83
2MASS J152039.74+354621.0 T0.0 C H 4on 2011 Dec. 31 9 × 12 × 10 0.70 6
2MASS J154614.61+493211.4 T2.5 H 2011 Dec. 31 9 × 6 × 10 0.70 8
C H 4on 2011 Dec. 31 9 × 6 × 10 0.65
2MASS J000013.54+255418.0 T4.5 H 2007 Dec. 14 9 × 1 × 4 0.70 4
C H 4on 2007 Dec. 14 9 × 1 × 10 0.75
2MASS J003451.57+052305.0c T7.0 H 2009 Jan. 14 9 × 6 × 10 0.75 5
C H 4on 2009 Jan. 14 9 × 3 × 20 0.75
ULAS J081948.10+073323.2c T6.0p H 2007 Dec. 16 9 × 14 × 4 1.00 10
C H 4on 2007 Dec. 16 9 × 5 × 10 1.12
ULAS J085139.00+005341.0c T4.0 H 2007 Dec. 16 9 × 14 × 4 0.87 10
C H 4on 2007 Dec. 16 9 × 5 × 10 0.85
ULAS J085342.94+000651.8c T6.0p H 2007 Dec. 16 9 × 7 × 4 0.65 10
C H 4on 2007 Dec. 16 9 × 5 × 10 0.65
ULAS J085910.69+101017.1c T7.0 H 2007 Dec. 16 9 × 14 × 4 1.25 9
C H 4on 2007 Dec. 16 9 × 5 × 10 1.25
ULAS J094516.40+075545.6c T5.0 H 2007 Dec. 16 9 × 9 × 5 0.80 10
C H 4on 2007 Dec. 16 9 × 4 × 10 0.87

Notes. The top panel lists the T-type objects in the direction of the σ Orionis cluster. The bottom panel contains 15 field T-type dwarfs.

(a)

Spectroscopic spectral types taken from the literature.

(b)

H-band photometric calibration was performed using the VISTA Orion data presented in Peña Ramírez et al. (2012).

(c)

H-band photometric calibration was performed using the DR8 UKIDSS catalog. For all other sources, 2MASS data were employed.

Reference. (1) Burgasser et al. (1999); (2) Hawley et al. (2002); (3) Burgasser et al. (2002); (4) Knapp et al. (2004); (5) Burgasser et al. (2004a); (6) Chiu et al. (2006); (7) Looper et al. (2007); (8) Metchev et al. (2008); (9) Pinfield et al. (2008); (10) Burningham et al. (2010); (11) Zapatero Osorio et al. (2002a); (12) Bihain et al. (2009); (13) Peña Ramírez et al. (2012).

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