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Reference.org
T dwarf
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<p>An object with the spectral type T (also called T dwarf or methane brown dwarf) is either a <a href="/facts/Brown_dwarf/fa7kr9lH">brown dwarf</a> or young <a href="/facts/Rogue_planet/3t9nlDVa">free-floating planetary-mass object</a>. A directly imaged <a href="/facts/Exoplanet/zjfmqfUf">exoplanet</a> with a young age can also be a T-dwarf. T dwarfs are colder than <a href="/facts/L_dwarf/fa7kr9lH">L dwarfs</a>, but warmer than <a href="/facts/Y_dwarf/dYrIuK9H">Y dwarfs</a>. </p>