Browsing University of Hertfordshire by Author "Tuomi, M."

Now showing items 1-7 of 7

    • Application of Bayesian model inadequacy criterion for multiple data sets to radial velocity models of exoplanet systems 

      Tuomi, M.; Pinfield, D.J.; Jones, H.R.A. (2011-08)
      We present a simple mathematical criterion for determining whether a given statistical model does not describe several independent sets of measurements, or data modes, adequately. We derive this criterion for two data sets ...

    • Bayesian re-analysis of the radial velocities of Gliese 581. Evidence in favour of only four planetary companions 

      Tuomi, M. (2011-02-16)
      Aims: The Gliese 581 planetary system has received attention because it has been proposed to host a low-mass planet in its habitable zone. We re-analyse the radial velocity measurements reported to contain six planetary ...

    • A candidate super-Earth planet orbiting near the snow line of Barnard's star 

      Ribas, I.; Tuomi, M.; Reiners, A.; Butler, R. P.; Morales, J. C.; Perger, M.; Dreizler, S.; Rodríguez-López, C.; Hernández, J. I. González; Rosich, A.; Feng, F.; Trifonov, T.; Vogt, S. S.; Caballero, J. A.; Hatzes, A.; Herrero, E.; Jeffers, S. V.; Lafarga, M.; Murgas, F.; Rodríguez, E.; Strachan, J. B. P.; Tal-Or, L.; Teske, J.; Toledo-Padrón, B.; Zechmeister, M.; Quirrenbach, A.; Amado, P. J.; Azzaro, M.; Béjar, V. J. S.; Barnes, J. R.; Berdiñas, Z. M.; Coleman, G.; Cortés-Contreras, M.; Crane, J.; Engle, S. G.; Guinan, E. F.; Haswell, C. A.; Henning, Th; Holden, B.; Jones, H. R. A.; Kaminski, A.; Kiraga, M.; Kürster, M.; López-González, M. J.; Montes, D.; Morin, J.; Ofir, A.; Pallé, E.; Rebolo, R.; Reffert, S.; Schweitzer, A.; Seifert, W.; Shectman, S. A.; Staab, D.; Street, R. A.; Mascareño, A. Suárez; Tsapras, Y.; Anglada-Escudé, G. (2018-11-15)
      Barnard’s star is a red dwarf, and has the largest proper motion (apparent motion across the sky) of all known stars. At a distance of 1.8 parsecs, it is the closest single star to the Sun; only the three stars in the α ...

    • A hot Uranus orbiting the super metal-rich star 77338 and the metallicity-mass connection 

      Jenkins, J. S.; Jones, H.R.A.; Tuomi, M.; Murgas, F.; Hoyer, S.; Jones, M. I.; Barnes, J. R.; Pavlenko, Y. V.; Ivanyuk, O.; Rojo, P.; Jordan, A.; Day-Jones, A. C.; Ruiz, M. T.; Pinfield, D.J. (2013-04-01)
      We announce the discovery of a low-mass planet orbiting the super metal-rich K0V star HD 77338 as part of our ongoing Calan-Hertfordshire Extrasolar Planet Search. The best-fit planet solution has an orbital period of ...

    • A Reanalysis of the UVES M Dwarf Planet Search Program 

      Butler, R. P.; Jones, Hugh; Feng, F.; Escude, G. Anglada; Tuomi, M.; Keiser, Sandy (2019-12-02)
      The UVES (Ultraviolet and Visible Spectrometer) M Dwarf Planet Search program surveyed 40 M dwarfs and 1 M giant from 2000 through 2007 March. Two of the M dwarfs were double-lined spectroscopic binaries. The 38 single-lined ...

    • Red Optical Planet Survey : A radial velocity search for low mass M dwarf planets 

      Barnes, J.R.; Jenkins, J. S.; Jones, H.R.A.; Rojo, P.; Arriagada, P.; Jordan, A.; Minniti, D.; Tuomi, M.; Jeffers, S.V.; Pinfield, D.J. (EDP Sciences, 2013)
      We present radial velocity results from our Red Optical Planet Survey (ROPS), aimed at detecting low-mass planets orbiting mid-late M dwarfs. The similar to 10 ms(-1) precision achieved over 2 consecutive nights with the ...

    • Surfing the photon noise : New techniques to find low-mass planets around M dwarfs 

      Anglada-Escude, G.; Butler, R. P.; Reiners, A.; Jones, H.R.A.; Tuomi, M.; Jenkins, J. S.; Barnes, J.R.; Vogt, S. S.; Zechmeister, M. (2013-02)
      The current precision radial velocities techniques to detect low mass planets in M dwarf are quickly reviewed. This includes high resolution spectroscopic observations made both in the optical and in the near infrared. We ...