Browsing by Author "Catalan, S."

Now showing items 1-13 of 13

    • A 1500 deg(2) near infrared proper motion catalogue from the UKIDSS Large Area Survey 

      Smith, Leigh; Lucas, P.W.; Burningham, B.; Jones, H.R.A.; Smart, R.L.; Andrei, A.H.; Catalan, S.; Pinfield, D.J. (2014-02)
      The United Kingdom Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) began in 2005, with the start of the UKIDSS programme as a 7 year effort to survey roughly 4000 deg(2) at high Galactic latitudes in Y, J, H and ...

    • Anyone out there? Galactic halo post-AGB stars 

      Weston, S.; Napiwotzki, R.; Catalan, S. (American Institute of Physics (AIP), 2010)
      We present results of a survey of post-asymptotic giant branch stars (post-AGBs) at high galactic latitude. To date, few post-AGB stars are known throughout the Galaxy and the number of known members of the older populations ...

    • The brightest pure-H ultracool white dwarf 

      Catalan, S.; Tremblay, P. -E.; Pinfield, D.J.; Smith, Leigh; Zhang, Z. H.; Napiwotzki, R.; Marocco, F.; Day-Jones, A. C.; Gomes, J.; Forde, K.P.; Lucas, P.W.; Jones, H.R.A. (2012-10)
      We report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo ...

    • Discovery of the benchmark metal poor T8 dwarf BD+01 2920B 

      Pinfield, D.J.; Burningham, B.; Lodieu, N.; Leggett, S.; Tinney, C.G.; van Spaandonk, L.; Marocco, F.; Smart, R.; Gomes, J.; Smith, Leigh; Lucas, P.W.; Day-jones, A.; Murray, D.; Katsiyannis, A. C.; Catalan, S.; Cardoso, C.; Clarke, James; Folkes, S.; Galvez-Ortiz, M.; Homeier, D.; Jenkins, J.; Jones, H.R.A.; Zhang, Z. (2012)
      We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band ...

    • The ESO supernovae type Ia progenitor survey (SPY) : The radial velocities of 644 DA white dwarfs 

      Napiwotzki, R.; Karl, C. A.; Lisker, T.; Catalan, S.; Drechsel, H.; Heber, U.; Homeier, D.; Koester, D.; Leibundgut, B.; Marsh, T. R.; Moehler, S.; Nelemans, G.; Reimers, D.; Renzini, A.; Stroer, A.; Yungelson, L. (2019-07-27)
      Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We report results of a large radial velocity survey ...

    • Evolution of the solar activity over time and effects on planetary atmospheres. II. κ1 Ceti, an analog of the sun when life arose on earth 

      Ribas, I.; Porto de Mello, G.F.; Ferreira, L.D.; Hebrard, E.; Selsis, F.; Catalan, S.; Garces, A.; do Nascimento, J.D.; de Medeiros, J.R. (2010)
      The early evolution of Earth's atmosphere and the origin of life took place at a time when physical conditions at the Earth were radically different from its present state. The radiative input from the Sun was much enhanced ...

    • The first planet detected in the WTS : an inflated hot-Jupiter in a 3.35 day orbit around a late F-star [ERRATUM] 

      Cappetta, M.; Saglia, R.P.; Birkby, J. L.; Koppenhoefer, J.; Pinfield, D.J.; Hodgkin, S.T.; Cruz, P.; Kovacs, G.; Sipocz, B.; Barrado, D.; Nefs, B.; Pavlenko, Y. V.; Fossati, L.; Burgo, C. del; Martin, E. L.; Snellen, I.; Barnes, J.; Campbell, D. A.; Catalan, S.; Galvez-Ortiz, M. C.; Goulding, N.; Haswell, C.; Ivanyuk, O.; Jones, H.R.A.; Kuznetsov, M.; Lodieu, N.; Marocco, F.; Mislis, D.; Murgas, F.; Napiwotzki, R.; Palle, E.; Pollacco, D.; Baro, L. Sarro; Solano, E.; Steele, P.; Stoev, H.; Tata, R.; Zendejas, J. (2014-11-11)
      We report the discovery of WTS-1b, the first extrasolar planet found by the WFCAM Transit Survey, which began observations at the 3.8-m United Kingdom Infrared Telescope (UKIRT) in August 2007. Light curves comprising ...

    • J-band variability of M dwarfs in the WFCAM Transit Survey 

      Goulding, N. T.; Barnes, J. R.; Pinfield, D.J.; Kovacs, G.; Birkby, J.; Hodgkin, S.; Catalan, S.; Sipocz, B.; Jones, H.R.A.; del Burgo, C.; Jeffers, S.V.; Nefs, S.; Galvez-Ortiz, M. -C.; Martin, E. L. (2012-12)
      We present an analysis of the photometric variability of M dwarfs in the Wide Field Camera (WFCAM) Transit Survey. Although periodic light-curve variability in low mass stars is generally dominated by photospheric star ...

    • Periodic variability of spotted M dwarfs in WTS 

      Goulding, N. T.; Barnes, J.R.; Pinfield, D.J.; del Burgo, C.; Kovacs, G.; Birkby, J.; Hodgkin, S.; Catalan, S.; Sipocz, B.; Jones, H.R.A.; Jeffers, S.V.; Nefs, S. (EDP Sciences, 2013)
      We present an analysis of the photometric variability of M dwarfs in the WFCAM Transit Survey, selected from spectral types inferred by their WTS and SDSS colours, with periods detected using a Lomb-Scargle Periodogram ...

    • Search for the coolest white dwarfs in the Galaxy 

      Catalan, S.; Napiwotzki, R.; Hodgkin, S.T.; Pinfield, D.J.; Hornillos, D.C. (American Institute of Physics (AIP), 2010)
      A number of so-called ultra-cool white dwarfs have been detected in different surveys so far. However, based on anecdotal evidence it is believed that most or all of these ultra-cool white dwarfs are low-mass products of ...

    • A search for white dwarfs in the Galactic plane: : the field and the open cluster population 

      Raddi, R.; Catalan, S.; Gaensicke, B. T.; Hermes, J. J.; Napiwotzki, R.; Koester, D.; Tremblay, P. -E.; Barentsen, G.; Farnhill, H. J.; Mohr-Smith, M.; Drew, J. E.; Groot, P. J.; Guzman-Ramirez, L.; Parker, Q. A.; Steeghs, D.; Zijlstra, A. (2016-04-01)
      We investigated the prospects for systematic searches of white dwarfs at low Galactic latitudes, using the VLT Survey Telescope (VST) H$\alpha$ Photometric Survey of the Galactic plane and Bulge (VPHAS+). We targeted 17 ...

    • A spectroscopic and proper motion search of Sloan Digital Sky Survey : red subdwarfs in binary systems 

      Zhang, Z. H.; Pinfield, D.J.; Burningham, B.; Jones, H.R.A.; Galvez-Ortiz, M. C.; Catalan, S.; Smart, R. L.; Lepine, S.; Clarke, J. R. A.; Pavlenko, Ya V.; Murray, D. N.; Kuznetsov, M. K.; Day-Jones, A. C.; Gomes, J.; Marocco, F.; Sipocz, B. (2013-09)
      Red subdwarfs in binary systems are crucial for both model calibration and spectral classification. We search for red subdwarfs in binary systems from a sample of high proper motion objects with Sloan Digital Sky Survey ...

    • Time evolution of high-energy emissions of low-mass stars : I. Age determination using stellar chronology with white dwarfs in wide binaries 

      Garces, A.; Catalan, S.; Ribas, I. (2011)
      Context : Stellar ages are extremely difficult to determine and often subject to large uncertainties, especially for field low-mass stars. We plan to carry out a calibration of the decrease in high-energy emissions of ...