Now showing items 1-10 of 10

    • AD Leonis : Radial velocity signal of stellar rotation or spin-orbit resonance? 

      Tuomi, Mikko; Jones, Hugh R. A.; Anglada-Escudé, Guillem; Butler, R. Paul; Kiraga, Marcin; Vogt, Steven S. (2018-04-16)
      AD Leonis is a nearby magnetically active M dwarf. We find Doppler variability with a period of 2.23 days, as well as photometric signals: (1) a short-period signal, which is similar to the radial velocity signal, albeit ...
    • 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. XX. A solitary ice-giant planet orbiting HD 102365 

      Tinney, C. G.; Butler, R. Paul; Jones, H.R.A.; Wittenmyer, Robert A.; O'Toole, Simon; Bailey, Jeremy; Carter, Brad D. (2011)
      We present 12 years of precision Doppler data for the very nearby G3 star HD 102365, which reveals the presence of a Neptune-like planet with a 16.0 M-Earth minimum mass in a 122.1 day orbit. Very few "Super Earth" planets ...
    • A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone 

      Anglada-Escude, Guillem; Tuomi, Mikko; Gerlach, Enrico; Barnes, Rory; Heller, Rene; Jenkins, James S.; Wende, Sebastian; Vogt, Steven S.; Butler, R. Paul; Reiners, Ansgar; Jones, H.R.A. (2013-08-07)
      Context. Since low-mass stars have low luminosities, orbits at which liquid water can exist on Earth-sized planets are relatively close-in, which produces Doppler signals that are detectable using state-of-the-art Doppler ...
    • 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 LCES HIRES/Keck Precision Radial Velocity Exoplanet Survey 

      Butler, R. Paul; Vogt, Steven S.; Laughlin, Gregory; Burt, Jennifer A.; Rivera, Eugenio J.; Tuomi, Mikko; Teske, Johanna; Arriagada, Pamela; Diaz, Matias; Holden, Brad; Keiser, Sandy (2017-04-13)
      We describe a 20-year survey carried out by the Lick-Carnegie Exoplanet Survey Team (LCES), using precision radial velocities from HIRES on the Keck-I telescope to find and characterize extrasolar planetary systems orbiting ...
    • MagAO Imaging of Long-period Objects (MILO). II. A Puzzling White Dwarf around the Sun-like Star HD 11112 

      Rodigas, Timothy J.; Bergeron, P.; Simon, Amelie; Arriagada, Pamela; Faherty, Jackie; Anglada-Escude, Guillem; Mamajek, Eric E.; Weinberger, Alycia; Butler, R. Paul; Males, Jared R.; Morzinski, Katie; Close, Laird M.; Hinz, Philip M.; Bailey, Jeremy; Carter, Brad; Jenkins, James S.; Jones, Hugh; O'Toole, Simon; Tinney, C. G.; Wittenmyer, Rob; Debes, John (2016-11-10)
      HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct images of the source responsible for the trend using the Magellan ...
    • NO EVIDENCE for ACTIVITY CORRELATIONS in the RADIAL VELOCITIES of KAPTEYN'S STAR 

      Anglada-Escudé, G.; Tuomi, Mikko; Arriagada, P.; Zechmeister, M.; Jenkins, J. S.; Ofir, A.; Dreizler, S.; Gerlach, E.; Marvin, C. J.; Reiners, A.; Jeffers, S. V.; Butler, R. Paul; Vogt, S. S.; Amado, P. J.; Rodríguez-López, C.; Berdiñas, Z. M.; Morin, J.; Crane, J. D.; Shectman, S. A.; Díaz, M. R.; Sarmiento, L. F.; Jones, H. R A (2016-10-20)
      Stellar activity may induce Doppler variability at the level of a few m s-1 which can then be confused by the Doppler signal of an exoplanet orbiting the star. To first order, linear correlations between radial velocity ...
    • 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 ...