Browsing by Author "Vogt, Steven S."

Now showing items 1-8 of 8

    • 3D Selection of 167 Substellar Companions to Nearby Stars 

      Feng, Fabo; Butler, R. Paul; Vogt, Steven S.; Clement, Matthew S.; Tinney, C. G.; Cui, Kaiming; Aizawa, Masataka; Jones, Hugh R. A.; Bailey, J.; Burt, Jennifer; Carter, B. D.; Crane, Jeffrey D.; Dotti, Francesco Flammini; Holden, Bradford; Ma, Bo; Ogihara, Masahiro; Oppenheimer, Rebecca; O’Toole, S. J.; Shectman, Stephen A.; Wittenmyer, Robert A.; Wang, Sharon X.; Wright, D. J.; Xuan, Yifan (2022-08-26)
      We analyze 5108 AFGKM stars with at least five high-precision radial velocity points, as well as Gaia and Hipparcos astrometric data, utilizing a novel pipeline developed in previous work. We find 914 radial velocity signals ...

    • 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 ...

    • 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 ...

    • Exploring the robustness of Keplerian signals to the removal of active and telluric features 

      Lisogorskyi, Maksym; Jones, Hugh R. A.; Feng, Fabo; Butler, R. Paul; Vogt, Steven S. (2020-10-22)
      We examine the influence of activity- and telluric-induced radial velocity signals on high resolution spectra taken with an iodine absorption cell. We exclude 2 Angstrom spectral chunks containing active and telluric lines ...

    • 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 ...

    • Optimized modeling of Gaia-Hipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low mass companions 

      Feng, Fabo; Butler, R. Paul; Jones, Hugh R. A.; Phillips, Mark W.; Vogt, Steven S.; Oppenheimer, Rebecca; Holden, Bradford; Boss, Alan P. (2021-08-03)
      To fully constrain the orbits of low mass circumstellar companions, we conduct combined analyses of the radial velocity data as well as the Gaia and Hipparcos astrometric data for eight nearby systems. Our study shows that ...

    • 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 ...

    • 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 ...