Browsing by Author "O'Toole, S."

Now showing items 1-16 of 16

    • The 2:1 resonant exoplanetary system orbiting HD 73526 

      Tinney, C.G.; Butler, R.P.; Marcy, G.W.; Jones, H.R.A.; Laughlin, G.; Carter, B.D.; Bailey, J.; O'Toole, S. (2006)
      We report the detection of a second exoplanet orbiting the G6 V dwarf HD 73526. This second planet has an orbital period of 377 days, putting it in a 2:1 resonance with the previously known exoplanet, the orbital period ...

    • Beyond the Iron Peak: r- and s-process Elemental Abundances in Stars with Planets 

      Bond, J.; Lauretta, D.S.; Tinney, C.G.; Butler, R.P.; Marcy, G.W.; Jones, H.R.A.; Carter, B.D.; O'Toole, S.; Bailey, J. (2008)
      We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd, and Eu (along with ...

    • The frequency of low-mass exoplanets 

      O'Toole, S.; Jones, H.R.A.; Tinney, C.G.; Butler, R.P.; Marcy, G.W.; Carter, B.D.; Bailey, J.; Wittenmyer, R. (2009)
      We report first results from the Anglo-Australian Telescope Rocky Planet Search—an intensive, high-precision Doppler planet search targeting low-mass exoplanets in contiguous 48 night observing blocks. On this run, we ...

    • The frequency of low-mass exoplanets. II. The "Period Valley" 

      Wittenmyer, R.; O'Toole, S.; Jones, H.R.A.; Tinney, C.G.; Butler, R.P.; Carter, B.D.; Bailey, J. (2010)
      Radial-velocity planet search campaigns are now beginning to detect low-mass "Super-Earth" planets, with minimum masses M sin i 10 M ⊕. Using two independently developed methods, we have derived detection limits from nearly ...

    • Hypervelocity Stars: Young and Heavy or Old and Light? 

      Heber, U.; Hirsch, H.; Edelmann, H.; Napiwotzki, R.; O'Toole, S.; Brown, W.; Altmann, M. (Astronomical Society of the Pacific, 2008)
      The first three hyper-velocity stars (HVS) unbound to the Galaxy were serendipitously discovered in 2005. The only suggested origin of hyper-velocity stars is the Galactic Centre as it hosts a super-massive black hole ...

    • The impact of stellar oscillations on Doppler velocity planet searches 

      O'Toole, S.; Tinney, C.G.; Jones, H.R.A. (2008)

    • A Jupiter-Like Planet Orbiting the Nearby M dwarf GJ 832 

      Bailey, J.; Butler, R.P.; Tinney, C.G.; Jones, H.R.A.; O'Toole, S.; Carter, B.D.; Marcy, G.W. (2009)

    • A long-period planet orbiting a nearby Sun-like star 

      Jones, H.R.A.; Butler, R.P.; Tinney, C.G.; O'Toole, S.; Wittenmyer, R.; Henry, G.W.; Meschiari, S.; Vogt, S.; Rivera, E.; Laughlin, G.; Carter, B.D.; Bailey, J.; Jenkins, J.S. (2010)
      The Doppler wobble induced by the extra-solar planet HD 134987b was first detected by data from the Keck Telescope nearly a decade ago, and was subsequently confirmed by data from the Anglo-Australian Telescope (AAT). ...

    • The MUCHFUSS project - Searching for hot subdwarf binaries with massive unseen companions : survey, target selection and atmospheric parameters 

      Geier, S.; Hirsch, H.; Tillich, A.; Maxted, P.F.L.; Bentley, S.J.; Ostensen, R.; Heber, U.; Gansicke, B.T.; Marsh, T.R.; Napiwotzki, R.; Barlow, B.N.; O'Toole, S. (2011)
      The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding sdBs with compact companions like supermassive white dwarfs (M > 1.0M⊙), neutron stars or black holes. The existence ...

    • NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys 

      Jenkins, J.S.; Jones, H.R.A.; Biller, B.; O'Toole, S.; Pinfield, D.J.; Close, L.; Tinney, C.G.; Butler, R.P.; Wittenmyer, R.; Carter, B.D.; Day-Jones, A.C. (2010)
      Context. Direct imaging of brown dwarfs as companions to solar-type stars can provide a wealth of well-constrained data to “benchmark” the physics of such objects, since quantities like metallicity and age can be determined ...

    • A Neptune-mass Planet Orbiting the Nearby G Dwarf HD 16417 

      O'Toole, S.; Tinney, C.G.; Butler, R.P.; Jones, H.R.A.; Bailey, J.; Carter, B.D.; Vogt, S.; Laughlin, G.; Rivera, E. (2009)
      Precision Doppler measurements from an intensive 48 night "Rocky Planet Search" observing campaign on the Anglo-Australian Telescope (AAT) have revealed the presence of a low-mass exoplanet orbiting the G1 dwarf HD 16417. ...

    • New planets around Three G Dwarfs 

      O'Toole, S.; Butler, R.P.; Tinney, C.G.; Jones, H.R.A.; Marcy, G.W.; Carter, B.D.; McCarthy, C.; Bailey, J.; Penny, A.J.; Apps, K.; Fischer, D.A. (2007)

    • On the frequency of Jupiter analogs 

      Wittenmyer, R.; Tinney, C.G.; O'Toole, S.; Jones, H.R.A.; Butler, R.P.; Carter, B.D.; Bailey, J. (2011)
      The Anglo-Australian Planet Search has now accumulated 12 years of radial-velocity data with long-term instrumental precision better than 3 m s-1. In this paper, we expand on earlier simulation work, to probe the frequency ...

    • Selection functions in doppler planet searches 

      O'Toole, S.; Tinney, C.G.; Jones, H.R.A.; Butler, R.P.; Marcy, G.W.; Carter, B.D.; Bailey, J. (2009)
      We present a preliminary analysis of the sensitivity of Anglo-Australian Planet Search data to the orbital parameters of extrasolar planets. To do so, we have developed new tools for the automatic analysis of large-scale ...

    • Signals embedded in the radial velocity noise: Periodic variations in the tau Ceti velocities 

      Tuomi, Mikko; Jones, H.R.A.; Jenkins, James Stewart; Tinney, C.G.; Butler, R.P.; Vogt, Steven S.; Barnes, John; Wittenmyer, Robert A.; O'Toole, S.; Horner, J.; Bailey, J.; Carter, B.D.; Wright, D. J.; Salter, G. S.; Pinfield, D.J. (2013-03)
      Context. The abilities of radial velocity exoplanet surveys to detect the lowest-mass extra-solar planets are currently limited by a combination of instrument precision, lack of data, and “jitter”. Jitter is a general term ...

    • A super-earth and two Neptunes orbiting the nearby sun-like star 61 Virginis 

      Vogt, S.; Wittenmyer, R.; Butler, R.P.; O'Toole, S.; Henry, G.W.; Rivera, E.; Meschiari, S.; Laughlin, G.; Tinney, C.G.; Jones, H.R.A.; Bailey, J.; Carter, B.D.; Batygin, K. (2010)
      We present precision radial velocity data that reveal a multiple exoplanet system orbiting the bright nearby G5V star 61 Virginis. Our 4.6 years of combined Keck/HIRES and Anglo-Australian Telescope precision radial ...