Browsing Research publications by Author "Butler, R. P."

Now showing items 1-19 of 19

    • 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 ...

    • The Anglo-Australian planet search. XXII : Two new multi-planet systems 

      Wittenmyer, Robert A.; Horner, J.; Tuomi, Mikko; Salter, G. S.; Tinney, C.G.; Butler, R. P.; Jones, H.R.A.; O'Toole, S. J.; Bailey, J.; Carter, B. D.; Jenkins, J. S.; Zhang, Z.; Vogt, S. S.; Rivera, Eugenio J. (2012-07-10)
      We report the detection of two new planets from the Anglo-Australian Planet Search. These planets orbit two stars each previously known to host one planet. The new planet orbiting HD 142 has a period of 6005 +/- 427 days, ...

    • The Anglo-Australian planet search. XXIII. Two new jupiter analogs 

      Wittenmyer, Robert A.; Horner, Jonathan; Tinney, C. G.; Butler, R. P.; Jones, H. R A; Salter, G. S.; Carter, B. D.; Koch, F. Elliott; O'Toole, S. J.; Bailey, J.; Wright, D.; Tuomi, Mikko (2014-03-10)
      We report the discovery of two long-period giant planets from the Anglo-Australian Planet Search. HD 154857c is in a multiple-planet system, while HD 114613b appears to be solitary. HD 114613b has an orbital period P = ...

    • 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 ...

    • Color difference makes a difference: four planet candidates around tau Ceti 

      Feng, F.; Tuomi, Mikko; Jones, Hugh; Barnes, J.; Anglada-Escude, G.; Vogt, S. S.; Butler, R. P. (2017-09-05)
      The removal of noise typically correlated in time and wavelength is one of the main challenges for using the radial velocity method to detect Earth analogues. We analyze radial velocity data of tau Ceti and find robust ...

    • Cool Jupiters greatly outnumber their toasty siblings : Occurrence rates from the Anglo-Australian Planet Search 

      Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Butler, R. P.; Tinney, C. G.; Carter, B. D.; Wright, D. J.; Jones, H. R. A.; Bailey, J.; O'Toole, S. J.; Johns, Daniel (2020-02-01)
      Our understanding of planetary systems different to our own has grown dramatically in the past 30 yr. However, our efforts to ascertain the degree to which the Solar system is abnormal or unique have been hindered by the ...

    • A detailed analysis of the HD 73526 2:1 resonant planetary system 

      Wittenmyer, Robert A.; Tan, Xianyu; Lee, Man Hoi; Horner, Jonathan; Tinney, C.G.; Butler, R. P.; Salter, G. S.; Carter, B. D.; Jones, H.R.A.; O'Toole, S. J.; Bailey, J.; Wright, D.; Crane, J. D.; Schectman, S. A.; Arriagada, P.; Thompson, I.; Minniti, D.; Diaz, M. (2014-01-10)
      We present six years of new radial velocity data from the Anglo-Australian and Magellan Telescopes on the HD 73526 2:1 resonant planetary system. We investigate both Keplerian and dynamical ( interacting) fits to these ...

    • Forever alone? : Testing single eccentric planetary systems for multiple companions 

      Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Tinney, C.G.; Butler, R. P.; Jones, H.R.A.; O'Toole, S. J.; Bailey, J.; Carter, B. D.; Salter, G. S.; Wright, D.; Zhou, Ji-Lin (2013-09)
      Determining the orbital eccentricity of an extrasolar planet is critically important for understanding the system's dynamical environment and history. However, eccentricity is often poorly determined or entirely mischaracterized ...

    • 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. ...

    • GJ 832c : A super-earth in the habitable zone 

      Wittenmyer, Robert A.; Tuomi, Mikko; Butler, R. P.; Jones, Hugh; Anglada-Escudé, Guillem; Horner, Jonathan; Tinney, C. G.; Marshall, J. P.; Carter, B. D.; Bailey, J.; Salter, G. S.; O'Toole, S. J.; Wright, D.; Crane, J. D.; Schectman, S. A.; Arriagada, P.; Thompson, I.; Minniti, D.; Jenkins, J. S.; Diaz, M. (2014-08-05)
      We report the detection of GJ 832c, a super-Earth orbiting near the inner edge of the habitable zone of GJ 832, an M dwarf previously known to host a Jupiter analog in a nearly circular 9.4 yr orbit. The combination of ...

    • A Goldilocks principle for modelling radial velocity noise 

      Feng, F.; Tuomi, Mikko; Jones, Hugh; Butler, R. P.; Vogt, S. (2016-09-21)
      The doppler measurements of stars are diluted and distorted by stellar activity noise. Different choices of noise models and statistical methods have led to much controversy in the confirmation of exoplanet candidates ...

    • A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU 

      Damasso, M.; Del Sordo, Fabio; Anglada Escude, Guillem; Giacobbe, P.; Sozzetti, Alessandro; Morbidelli, L.; Pojmański, G.; Barbato, Domenico; Butler, R. P.; Jones, Hugh; Hambsch, Franz-Josef; Jenkins, James S.; Lopez-Gonzalez, Maria J.; Morales, Nicolas; Peña Rojas, Pablo A.; Rodriguez-Lopez, Cristina; Rodriguez, Eloy; Amado, Pedro J.; Anglada, Guillem; Feng, F.; Gómez, Jose F. (2020-01-15)
      Our nearest neighbor, Proxima Centauri, hosts a temperate terrestrial planet. We detected in radial velocities evidence of a possible second planet with minimum mass m c sin i c = 5.8 ± 1.9 M ⊕ and orbital period P c = ...

    • A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887 

      Jeffers, S. V.; Dreizler, S.; Barnes, J. R.; Haswell, C. A.; Nelson, R. P.; Rodríguez, E.; Lopez-Gonzalez, M. J.; Morales, N.; Luque, R.; Zechmeister, M.; Vogt, S. S.; Jenkins, J. S.; Palle, E.; Berdinas, Z. M.; Coleman, G. A. L.; Diaz, M. R.; Ribas, I.; Jones, H. R. A.; Butler, R. P.; Tinney, C. G.; Bailey, J.; Carter, B. D.; ~O'Toole, S.; Wittenmyer, R. A.; Crane, J. D.; Feng, F.; Shectman, S. A.; Teske, J.; Reiners, A.; Amado, P. J.; Anglada-Escude, G.; . (2020-06-26)
      The closet exoplanets to the Sun provide opportunities for detailed characterization of planets outside the Solar System. We report the discovery, using radial velocity measurements, of a compact multiplanet system of ...

    • New Planetary Systems from the Calan-Hertfordshire Extrasolar Planet Search and the Core Accretion Mass Limit 

      Jenkins, J. S.; Jones, Hugh; Tuomi, Mikko; Diaz, M.; Cordero, J. P.; Aguayo, A.; Pantoja, B.; Arriagada, P.; Mahu, R.; Brahm, R.; Rojo, P.; Soto, M. G.; Ivanyuk, O.; Becerra Yoma, N.; Day-Jones, A. C.; Ruiz, M. T.; Pavlenko, Y. V.; Barnes, J. R.; Murgas, F.; Pinfield, David; Jones, M. I.; Lopez-Morales, M.; Shectman, S.; Butler, R. P.; Minniti, D. (2017-04-01)
      We report the discovery of eight new giant planets, and updated orbits for four known planets, orbiting dwarf and subgiant stars using the CORALIE, HARPS, and MIKE instruments as part of the Calan–Hertfordshire Extrasolar ...

    • The observed distribution of spectroscopic binaries from the Anglo-Australian Planet Search 

      Jenkins, J. S.; Díaz, M.; Jones, Hugh; Butler, R. P.; Tinney, Chris G.; O'Toole, S. J.; Carter, B.D.; Wittenmyer, R.; Pinfield, David (2015-10-21)
      We report the detection of sixteen binary systems from the Anglo-Australian Planet Search. Solutions to the radial velocity data indicate that the stars have companions orbiting with a wide range of masses, eccentricities ...

    • 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 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 ...

    • Searching for Faint Comoving Companions to the α Centauri system in the VVV Survey Infrared Images 

      Beamin, J.C.; Minniti, D.; Pullen, J. B.; Ivanov, Valentin D.; Bendek, E.; Bayo, A.; Gromadzki, M.; Kurtev, R.; Lucas, P. W.; Butler, R. P. (2017-12-21)
      The VVV survey has observed the southern disk of the Milky Way in the near infrared, covering 240 deg$^{2}$ in the $ZYJHK_S$ filters. We search the VVV Survey images in a $\sim$19 deg$^{2}$ field around $\alpha$ Centauri, ...

    • 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 ...