Browsing Research publications by Author "Penna, J.L."

Now showing items 1-3 of 3

    • NPARSEC : NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results 

      Smart, R.L.; Tinney, C.G.; Bucciarelli, B.; Marocco, F.; Abbas, U.; Andrei, A.; Bernardi, G.; Burningham, B.; Cardoso, C.; Costa, E.; Crosta, M.T.; Dapra, M.; Day-Jones, A.; Goldman, B.; Jones, H.R.A.; Lattanzi, M.G.; Leggett, S.K.; Lucas, P.W.; Mendez, R.; Penna, J.L.; Pinfield, D.J.; Smith, Leigh; Sozzetti, A.; Vecchiato, A. (2013-08)
      The discovery and subsequent detailed study of T dwarfs have provided many surprises and pushed the physics and modelling of cool atmospheres in unpredicted directions. Distance is a critical parameter for studies of these ...

    • Parallaxes of southern extremely cool objects (PARSEC). II : Spectroscopic follow-up and parallaxes of 52 targets 

      Marocco, F.; Andrei, A.H.; Smart, R.L.; Jones, H.R.A.; Pinfield, D.J.; Day-Jones, A. C.; Clarke, J. R. A.; Sozzetti, A.; Lucas, P.W.; Bucciarelli, B.; Penna, J.L. (2013-12)
      We present near-infrared spectroscopy for 52 ultracool dwarfs, including two newly discovered late-M dwarfs, one new late-M subdwarf candidate, three new L, and four new T dwarfs. We also present parallaxes and proper ...

    • Parallaxes of southern extremely cool objects. I. : Targets, proper motions, and first results 

      Andrei, A.H.; Smart, R.L.; Penna, J.L.; d'Avila, V.A.; Bucciarelli, B.; Camargo, J.I.B.; Crosta, M.T.; Dapra, M.; Goldman, B.; Jones, H.R.A.; Lattanzi, M.G.; Nicastro, L.; Pinfield, D.J.; da Silva Neto, D. N.; Teixeira, R. (2011)
      We present results from the PARallaxes of Southern Extremely Cool objects ( PARSEC) program, an observational program begun in 2007 April to determine parallaxes for 122 L and 28 T southern hemisphere dwarfs using the Wide ...