First detection of deuterium in an atmosphere beyond the solar system, via CH3D in the cold brown dwarf WISE 0855-0714, yielding a protosolar D/H ratio, plus a part-per-billion phosphine abundance.
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Protosolar D-to-H abundance and one part-per-billion PH$_{3}$ in the coldest brown dwarf
First detection of deuterium in an atmosphere beyond the solar system, via CH3D in the cold brown dwarf WISE 0855-0714, yielding a protosolar D/H ratio, plus a part-per-billion phosphine abundance.