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Table 2

Summary of optical and near-infrared spectra available in the literature and presence of youth spectroscopic features.

Object SpT Li ia Peaked Hb Gc Ref.

J00331521 L4β N N FLD 1, 2
J0045+1634 L2β N, Y Y VL 1, 2, 3
J02410326 L0γ N Y VL 1, 2, 3
J0355+1133 L5γ Y Y VL 1, 2, 3, 4
J05010010 L4γ Y Y VL 1, 2, 5
G 196–3B L3β Y Y VL 1, 2, 3, 5, 6, 7
J1022+5825 L1β N N FLD 1, 2
J1552+2948 L0β N Y INT 1, 2
J1726+1538 L3β N, Y Y INT 8, 1, 2
J2208+2921 L3γ Y Y VL 1, 2



Lithium at 670.8 nm. For a couple of objects, some authors claim detection (“Y”) and others do not (“N”); this likely depends on the quality and spectral resolution of the data.


“N” stands for no detection of this feature in the near-infrared spectrum.


Gravity class indicator from Allers & Liu (2013): very low (VL), intermediate (INT), and high (FLD) gravity.

Reference. (1) Cruz et al. (2009, and references therein); (2) Allers & Liu (2013); (3) this paper; (4) Faherty et al. (2013); (5) Allers et al. (2010); (6) Rebolo et al. (1998); (7) Zapatero Osorio et al. (2010); (8) Schweitzer et al. (2001).

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