Browsing University of Hertfordshire by Author "Galvez-Ortiz, M.C."

Now showing items 1-8 of 8

    • BD+20 1790 b : chronicle of an exoplanetary discovery 

      Hernan-Obispo, M.; Galvez-Ortiz, M.C.; Anglada-Escude, G.; Kane, S.R.; De Castro, E.; Cornide, M. (American Institute of Physics (AIP), 2009)
      In this contribution we report evidence for a planetary companion around a young and active late-type K star. Our group has been developing a study of stellar activity and kinematics for this star over the past years. ...

    • Beryllium abundances in stars with planets : extending the sample 

      Galvez-Ortiz, M.C.; Delgado-Mena, E.; Hernandez, J.; Israelian, G.; Santos, N.C.; Rebolo, R.; Ecuvillon, A. (2011)
      Context : Chemical abundances of light elements such as beryllium in planet-host stars allow us to study the planet formation scenarios and/or investigate possible surface pollution processes. Aims : We present here an ...

    • The discovery of an M4+T8.5 binary system 

      Burningham, B.; Pinfield, D.J.; Leggett, S.K.; Tinney, C.G.; Liu, M.C.; Homeier, D.; West, A.A.; Day-Jones, A.C.; Huelamo, N.; Dupuy, T.J.; Zhang, Z.; Murray, D.N.; Lodieu, N.; Navascues, D.B.Y.; Folkes, S.; Galvez-Ortiz, M.C.; Jones, H.R.A.; Lucas, P.W.; Calderon, M.M.; Tamura, M. (2009)
      We report the discovery of a T8.5 dwarf, which is a companion to the M4 dwarf Wolf 940. [Please see original online abstract for complete version with correct notation]

    • Discovery of the first L dwarf plus giant binary system and eight other ultracool dwarfs in wide binaries 

      Zhang, Z.; Pinfield, D.J.; Day-Jones, A.C.; Burningham, B.; Jones, H.R.A.; Yu, S.; Jenkins, J.S.; Han, Z.; Galvez-Ortiz, M.C.; Gallardo, J.; Garcia Perez, A.E.; Weights, D.; Tinney, C.G.; Pokorny, R.S. (2010)
      We identify 806 ultracool dwarfs (of which 34 are newly discovered L dwarfs) from their Sloan Digital Sky Survey (SDSS) riz photometry and obtain proper motions through cross-matching with the United Kingdom Infrared ...

    • Evidence of a massive planet candidate orbiting the young active K5V star BD+20 1790 

      Hernan-Obispo, M.; Galvez-Ortiz, M.C.; Anglada-Escude, G.; Kane, S.R.; Barnes, J.R.; De Castro, E.; Cornide, M. (2010)
      Context. BD+20 1790 is a young active, metal-rich, late-type K5Ve star. We have undertaken a study of stellar activity and kinematics for this star over the past few years. Previous results show a high level of stellar ...

    • A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age 

      Lopez-Santiago, J.; Montes, D.; Galvez-Ortiz, M.C.; Crespo-Chacon, I.; Martinez-Arnaiz, R.M.; Fernandez-Figueroa, M.J.; De Castro, E.; Cornide, M. (2010)
      Aims. We present a compilation of spectroscopic data from a survey of 144 chromospherically active young stars in the solar neighborhood, which may be used to investigate different aspects of its formation and evolution ...

    • A search for southern ultracool dwarfs in young moving groups 

      Clarke, J.R.A.; Pinfield, D.J.; Galvez-Ortiz, M.C.; Jenkins, J.S.; Burningham, B.; Deacon, Niall; Jones, H.R.A.; Pokorny, R.S.; Barnes, J.R.; Day-Jones, A.C. (2010)
      We associate 132 low-mass ultracool dwarfs in the southern hemisphere as candidate members of five moving groups (MGs) using photometric and astrometric selection techniques. Of these objects, we present high-resolution ...

    • Ultra-cool dwarfs: new discoveries, proper motions and improved spectral typing from SDSS and 2MASS photometric colors 

      Zhang, Z.H.; Pokorny, R.S.; Jones, H.R.A.; Pinfield, D.J.; Chen, P.S.; Han, Z.; Chen, D.; Galvez-Ortiz, M.C.; Burningham, B. (2009)