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HD and H$_{\\rm 2}$ are detected in HST/COS data of a low metallicity ($Z \\sim 0.07Z_\\odot$) damped Ly$\\alpha$ system at $z = 0.18562$ toward QSO B0120$-$28, with log $N$(H I) = 20.50 $\\pm$ 0.10. Four absorption components are clearly resolved in H$_{\\rm 2}$ while two components are resolved in HD; the bulk of the molecular hydrogen is associated with the components traced by HD. We find total column densities log $N$(HD) = 14.82 $\\pm$ 0.15 and log $N$(H$_{\\rm 2}$) = 20.00 $\\pm$ 0.10. 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Oliveira, Jason Tumlinson, John O'Meara, Kenneth R. Sembach","submitted_at":"2014-01-16T23:36:01Z","abstract_excerpt":"We report on the detection of deuterated molecular hydrogen, HD, at $z = 0.18$. HD and H$_{\\rm 2}$ are detected in HST/COS data of a low metallicity ($Z \\sim 0.07Z_\\odot$) damped Ly$\\alpha$ system at $z = 0.18562$ toward QSO B0120$-$28, with log $N$(H I) = 20.50 $\\pm$ 0.10. Four absorption components are clearly resolved in H$_{\\rm 2}$ while two components are resolved in HD; the bulk of the molecular hydrogen is associated with the components traced by HD. We find total column densities log $N$(HD) = 14.82 $\\pm$ 0.15 and log $N$(H$_{\\rm 2}$) = 20.00 $\\pm$ 0.10. 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