Browsing Research publications by Author "Jones, Hugh R. A."

Now showing items 1-20 of 32

    • 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 ...

    • Agatha: : disentangling periodic signals from correlated noise in a periodogram framework 

      Feng, Fabo; Tuomi, Mikko; Jones, Hugh R. A. (2017-10-01)
      Periodograms are used as a key significance assessment and visualisation tool to display the significant periodicities in unevenly sampled time series. We introduce a framework of periodograms, called "Agatha", to disentangle ...

    • AlH lines in the blue spectrum of Proxima Centauri 

      Pavlenko, Yakiv V.; Tennyson, Jonathan; Yurchenko, Sergei N.; Schmidt, Mirek R.; Jones, Hugh R. A.; Lyubchik, Yuri; Mascareño, A. Suárez (2022-11-30)
      The recently-computed ExoMol line lists for isotopologues of AlH are used to analyse the blue spectrum (4000-4500 {\AA}) of Proxima Cen (M5.5 V). Comparison of the observed and computed spectra enables the identification ...

    • All-sky Guide Star Catalog for CSST 

      Feng, Hui-Mei; Cao, Zi-Huang; Lam, Man I; Li, Ran; Tian, Hao; Yin, Da-Yi; Yang, Yuan-Yu; Zhang, Xin; Fan, Dong-Wei; Dong, Yi-Qiao; Li, Xin-Feng; Wang, Wei; Li, Long; Jones, Hugh R. A.; Tao, Yi-Han; Nie, Jia-Lu; Wang, Pei-Pei; Liu, Mao-Yuan; Yang, He-jun; Liu, Chao (2024-03-26)
      The China Space Station Telescope (CSST) is a two-meter space telescope with multiple back-end instruments. The Fine Guidance Sensor (FGS) is an essential subsystem of the CSST Precision Image Stability System to ensure ...

    • A blue depression in the optical spectra of M dwarfs 

      Jones, Hugh R. A.; Pavlenko, Yakiv; Lyubchik, Yuri; Bessell, Mike; Allard, Nicole; Pinfield, David J. (2023-05-12)
      A blue depression is found in the spectra of M dwarfs from 4000 to 4500A. This depression shows an increase toward lower temperatures though is particularly sensitive to gravity and metallicity. It is the single most ...

    • Constraints on the nearby exoplanet Eps Ind Ab from deep near/mid-infrared imaging limits 

      Viswanath, Gayathri; Janson, Markus; Dahlqvist, Carl-Henrik; Roche, Dominique Petit dit de la; Samland, Matthias; Girard, Julien; Pathak, Prashant; Kasper, Markus; Feng, Fabo; Meyer, Michael; Boehle, Anna; Quanz, Sascha P.; Jones, Hugh R. A.; Absil, Olivier; Brandner, Wolfgang; Maire, Anne-Lise; Siebenmorgen, Ralf; Sterzik, Michael; Pantin, Eric (2021-07-21)
      The past decade has seen increasing efforts in detecting and characterising exoplanets by high contrast imaging in the near/mid-infrared, which is the optimal wavelength domain for studying old, cold planets. In this work, ...

    • A dense mini-Neptune orbiting the bright young star HD 18599 

      Vines, Jose I.; Jenkins, James S.; Berdiñas, Zaira; Soto, Maritza G.; Díaz, Matías R.; Alves, Douglas R.; Tuomi, Mikko; Wittenmyer, Robert A.; Leon, Jerome Pitogo de; Peña, Pablo; Lissauer, Jack J.; Ballard, Sarah; Bedding, Timothy; Bowler, Brendan P.; Horner, Jonathan; Jones, Hugh R. A.; Kielkopf, John; Plavchan, Peter; Shporer, Avi; Tinney, C. G.; Wright, Hui Zhang Duncan J.; Addison, Brett; Mengel, Matthew W.; Okumura, Jack; Samadi-Ghadim, Anya (2022-10-13)
      Very little is known about the young planet population because the detection of small planets orbiting young stars is obscured by the effects of stellar activity and fast rotation which mask planets within radial velocity ...

    • 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 ...

    • Detection of the nearest Jupiter analog in radial velocity and astrometry data 

      Feng, Fabo; Anglada-Escudé, Guillem; Tuomi, Mikko; Jones, Hugh R. A.; Chanamé, Julio; Butler, Paul R.; Janson, Markus (2019-10-21)
      The presence of Jupiter is crucial to the architecture of the Solar System and models underline this to be a generic feature of planetary systems. We find the detection of the difference between the position and motion ...

    • Efficient Follow-Up of Exoplanet Transits Using Small Telescopes 

      Beck, Peter; Robson, Luke; Gallaway, Mark; Jones, Hugh R. A.; Campbell, David (2019-06-21)
      Here, we introduce an online tool for the prediction of exoplanet transit light curves. Small telescopes can readily capture exoplanet transits under good weather conditions when the combination of a bright star and a large ...

    • Evidence for at least three planet candidates orbiting HD20794 

      Feng, Fabo; Tuomi, Mikko; Jones, Hugh R. A. (2017-09-18)
      We explore the feasibility of detecting Earth analogs around Sun-like stars using the radial velocity method by investigating one of the largest radial velocities datasets for the one of the most stable radial-velocity ...

    • 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 Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at ≈2 au 

      Zeng, Yunlin; Brandt, Timothy D.; Li, Gongjie; Dupuy, Trent J.; Li, Yiting; Brandt, G. Mirek; Farihi, Jay; Horner, Jonathan; Wittenmyer, Robert A.; Butler, R. Paul.; Tinney, Christopher G.; Carter, Bradley D.; Wright, Duncan J.; Jones, Hugh R. A.; O’Toole, Simon J. (2022-10-12)
      Gliese 86 is a nearby K dwarf hosting a giant planet on a ≈16 day orbit and an outer white dwarf companion on a ≈century-long orbit. In this study we combine radial velocity data (including new measurements spanning more ...

    • The impact of unresolved magnetic spots on high precision radial velocity measurements 

      Lisogorskyi, Maksym; Saikia, Susdeshna Boro; Jeffers, Sandra V.; Jones, Hugh R. A.; Morin, Julien; Mengel, Matthew; Reiners, Ansgar; Vidotto, Aline A.; Petit, Pascal (2020-07-23)
      The Doppler method of exoplanet detection has been extremely successful, but suffers from contaminating noise from stellar activity. In this work a model of a rotating star with a magnetic field based on the geometry of ...

    • An improved quantification of HD 147379 b 

      Feng, Fabo; Jones, Hugh R. A.; Tuomi, Mikko (2018-02-05)
      We reanalyze the CARMENES and HIRES/KECK radial velocity data for HD 147379, and also analyze the SOPHIE data using the Agatha software in combination with MCMC posterior sampling. The analysis confirms the existence of ...

    • The metal rich abundance pattern - spectroscopic properties and abundances for 107 main-sequence stars 

      Ivanyuk, Oleksiy M.; Jenkins, James S.; Pavlenko, Yakiv V.; Jones, Hugh R. A.; Pinfield, David J. (2017-07-01)
      We report results from the high resolution spectral analysis of the 107 metal rich (mostly [Fe/H]$\ge$7.67 dex) target stars from the Calan-Hertfordshire Extrasolar Planet Search program observed with HARPS. Using our ...

    • Mitigating Modal Noise in Multimode Circular Fibres by Optical Agitation using a Galvanometer 

      Ghosh, Supriyo; Boonsri, Chantira; Martin, William; Jones, Hugh R. A.; Choochalerm, Piyamas; Usher, Sarah; Yerolatsitis, Stephanos; Wocial, Thomas; Wright, Thomas (2024-01-02)
      Modal noise appears due to the non-uniform and unstable distribution of light intensity among the finite number of modes in multimode fibres. It is an important limiting factor in measuring radial velocity precisely by ...

    • Modeling and Calibration of Gaia, Hipparcos, and Tycho-2 astrometric data for the detection of dark companions 

      Feng, Fabo; Rui, Yicheng; Xuan, Yifan; Jones, Hugh R. A. (2024-03-28)
      Hidden within the Gaia satellite’s multiple data releases lies a valuable cache of dark companions. To facilitate the efficient and reliable detection of these companions via combined analyses involving the Gaia, Hipparcos, ...

    • 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 ...