Browsing Research publications by Author "O'Toole, Simon J."

Now showing items 1-11 of 11

    • The Anglo-Australian planet search XXI : a gas-giant planet in a one year orbit and the habitability of gas-giant satellites 

      Tinney, C. G.; Wittenmyer, Robert A.; Butler, R. Paul; Jones, H.R.A.; O'Toole, Simon J.; Bailey, Jeremy A.; Carter, Brad D.; Horner, J. (2011-05-01)
      We have detected the Doppler signature of a gas-giant exoplanet orbiting the star HD 38283, in an eccentric orbit with a period of almost exactly one year (P = 363.2 +/- 1.6 d, m sin i = 0.34 +/- 0.02 M-Jup, e = 0.41 +/- ...

    • The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs 

      Wittenmyer, Robert A.; Butler, R. Paul; Tinney, C. G.; Horner, Jonathan; Carter, B. D.; Wright, D. J.; Jones, Hugh; Bailey, J.; O'Toole, Simon J. (2016-03-01)
      We present updated simulations of the detectability of Jupiter analogs by the 17-year Anglo-Australian Planet Search. The occurrence rate of Jupiter-like planets that have remained near their formation locations beyond the ...

    • The Anglo-Australian Planet Search XXV : A Candidate Massive Saturn Analog Orbiting HD 30177 

      Wittenmyer, Robert A.; Horner, Jonathan; Mengel, M. W.; Butler, R. P.; Tinney, C. G.; Carter, B. D.; Jones, H. R. A.; Anglada-Escude, G.; Bailey, J.; O'Toole, Simon J. (2017-03-20)
      We report the discovery of a second long-period giant planet orbiting HD 30177, a star previously known to host a massive Jupiter analog (HD 30177b: a=3.8$\pm$0.1 au, m sin $i=9.7\pm$0.5 Mjup). HD 30177c can be regarded ...

    • Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques 

      Kane, Stephen R.; Dalba, Paul A.; Li, Zhexing; Horch, Elliott P.; Hirsch, Lea A.; Horner, Jonathan; Wittenmyer, Robert A.; Howell, Steve B.; Everett, Mark E.; Butler, R. Paul; Tinney, Christopher G.; Carter, Brad D.; Wright, Duncan J.; Jones, Hugh R. A.; Bailey, Jeremy; O'Toole, Simon J. (2019-06-04)
      The sensitivities of radial velocity (RV) surveys for exoplanet detection are extending to increasingly longer orbital periods, where companions with periods of several years are now being regularly discovered. Companions ...

    • Direct imaging of long period radial velocity targets with NICI 

      Salter, Graeme S.; Tinney, Chris G.; Wittenmyer, Robert A.; Jenkins, James S.; Jones, H.R.A.; O'Toole, Simon J. (2013-06-30)
      We are finally entering an era where radial velocity and direct imaging parameter spaces are starting to overlap. Radial velocity measurements provide us with a minimum mass for an orbiting companion (the mass as a function ...

    • Evidence for Reflected Light from the Most Eccentric Exoplanet Known 

      Kane, Stephen R.; Wittenmyer, Robert A.; Hinkel, Natalie R.; Roy, Arpita; Mahadevan, Suvrath; Dragomir, Diana; Matthews, Jayme M.; Henry, Gregory W.; Chakraborty, Abhijit; Boyajian, Tabetha S.; Wright, Jason T.; Ciardi, David R.; Fischer, Debra A.; Butler, R. Paul; Tinney, C. G.; Carter, Brad D.; Jones, Hugh; Bailey, Jeremy; O'Toole, Simon J. (2016-04-11)
      Planets in highly eccentric orbits form a class of objects not seen within our solar system. The most extreme case known among these objects is the planet orbiting HD20782, with an orbital period of 597days and an ...

    • The frequency of low-mass exoplanets III. Toward eta-Earth at short periods 

      Wittenmyer, Robert A.; Tinney, C. G.; Butler, R. P.; O'Toole, Simon J.; Jones, H.R.A.; Carter, B. D.; Bailey, J.; Horner, J. (2011-09)
      Determining the occurrence rate of "super-Earth" planets (m sin i < 10 M ) is a critically important step on the path toward determining the frequency of Earth-like planets (η), and hence the uniqueness of our solar system. ...

    • Observing Strategies for the Detection of Jupiter Analogs 

      Wittenmyer, Robert A.; Tinney, C.G.; Horner, J.; Butler, R. P.; Jones, H.R.A.; O'Toole, Simon J.; Bailey, J.; Carter, Brad D.; Salter, G. S.; Wright, D. (2013-04)
      To understand the frequency, and thus the formation and evolution, of planetary systems like our own solar system, it is critical to detect Jupiter-like planets in Jupiter-like orbits. For long-term radial-velocity monitoring, ...

    • A planetary system around the nearby M dwarf GJ 667C with at least one super-earth in its habitable zone 

      Anglada-Escude, Guillem; Arriagada, Pamela; Vogt, Steven S.; Rivera, Eugenio J.; Butler, R. Paul; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Minniti, Dante; Haghighipour, Nader; Carter, Brad D.; Tinney, C.G.; Wittenmyer, Robert A.; Bailey, Jeremy A.; O'Toole, Simon J.; Jones, H.R.A.; Jenkins, J.S. (2012-05-20)
      We re-analyze 4 years of HARPS spectra of the nearby M1.5 dwarf GJ 667C available through the European Southern Observatory public archive. The new radial velocity (RV) measurements were obtained using a new data analysis ...

    • Substellar companions and the formation of hot subdwarf stars 

      Geier, Stephan; Heber, Ulrich; Tillich, Alfred; Hirsch, Heiko; Kupfer, Thomas; Schaffenroth, Veronika; Classen, Lew; Maxted, Pierre F. L.; Ostensen, Roy H.; Barlow, Brad N.; Marsh, Tom R.; Gaensicke, Boris T.; Napiwotzki, Ralf; O'Toole, Simon J.; Guenther, Eike W. (American Institute of Physics (AIP), 2011)
      We give a brief review over the observational evidence for close substellar companions to hot subdwarf stars. The formation of these core helium-burning objects requires huge mass loss of their red giant progenitors. It ...

    • Transits of Known Planets Orbiting a Naked-Eye Star 

      Kane, Stephen R.; Yalçınkaya, Selçuk; Osborn, Hugh P.; Dalba, Paul A.; Nielsen, Louise D.; Vanderburg, Andrew; Močnik, Teo; Hinkel, Natalie R.; Ostberg, Colby; Esmer, Ekrem Murat; Udry, Stéphane; Fetherolf, Tara; Baştürk, Özgür; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Allart, Romain; Bailey, Jeremy; Bean, Jacob L.; Bouchy, Francois; Butler, R. Paul; Campante, Tiago L.; Carter, Brad D.; Daylan, Tansu; Deleuil, Magali; Diaz, Rodrigo F.; Dumusque, Xavier; Ehrenreich, David; Horner, Jonathan; Howard, Andrew W.; Isaacson, Howard; Jones, Hugh R. A.; Kristiansen, Martti H.; Lovis, Christophe; Marcy, Geoffrey W.; Marmier, Maxime; O'Toole, Simon J.; Pepe, Francesco; Ragozzine, Darin; Ségransan, Damien; Tinney, C. G.; Turnbull, Margaret C.; Wittenmyer, Robert A.; Wright, Duncan J.; Wright, Jason T. (2020-09-01)
      Some of the most scientifically valuable transiting planets are those that were already known from radial velocity (RV) surveys. This is primarily because their orbits are well characterized and they preferentially orbit ...