Browsing Research publications by Author "Jones, Hugh"
Now showing items 1-20 of 35
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Abundances in the atmosphere of the metal-rich planet-host star HD 77338
Kushniruk, I.O.; Pavlenko, Ya. V.; Jenkins, J.S.; Jones, Hugh (2014)Abundances of Fe, Si, Ni, Ti, Na, Mg, Cu, Zn, Mn, Cr and Ca in the atmosphere of the K-dwarf HD 77338 are determined and discussed. HD 77338 hosts a hot Uranus-like planet and is currently the most metal-rich single star ... -
Activity and telluric contamination in HARPS observations of Alpha Centauri B
Lisogorskyi, Maksym; Jones, Hugh; Feng, Fabo (2019-06-01)The Alpha Centauri system is the primary target for planet search as it is the closest star system composed of a solar twin α CenA, a K-dwarf α Cen B, and an M-dwarf Proxima Centauri, which has a confirmed planet in the ... -
Analysis of combined radial velocities and activity of BD+20 1790: : evidence supporting the existence of a planetary companion
Hernán-Obispo, M.; Tuomi, Mikko; Gálvez-Ortiz, M. C.; Golovin, A.; Barnes, J. R.; Jones, Hugh; Kane, S. R.; Pinfield, D.; Jenkins, J. S.; Petit, P.; Anglada-Escudé, G.; Marsden, S. C.; Catalán, S.; Jeffers, S. V.; Castro, E. de; Cornide, M.; Garcés, A.; Jones, M. I.; Gorlova, N.; Andreev, M. (2015-04-01)This paper presents the simultaneous Bayesian analysis of the radial velocity and activity indices for the K5Ve active star BD+20 1790, that was proposed to host a close-in massive planet by Hern\'an-Obispo et al. (2010). ... -
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 ... -
Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics
Tuomi, Mikko; Jones, Hugh; Barnes, John R.; Anglada-Escudé, Guillem; Jenkins, James S. (2014-06-21)Due to their higher planet-star mass ratios, M dwarfs are the easiest targets for detection of low-mass planets orbiting nearby stars using Doppler spectroscopy. Furthermore, because of their low masses and luminosities, ... -
Calculations of periodicity from Halpha profiles of Proxima Centauri
Collins, John; Jones, Hugh; Barnes, John (2017-06-07)We investigate retrieval of the stellar rotation signal for Proxima Centauri. We make use of high-resolution spectra taken with UVES and HARPS of Proxima Centauri over a 13-yr period as well as photometric observations of ... -
A chemical survey of exoplanets with ARIEL
Tinetti, Giovanna; Drossart, Pierre; Eccleston, Paul; Hartogh, Paul; Heske, Astrid; Leconte, Jérémy; Micela, Giusi; Ollivier, Marc; Pilbratt, Göran; Puig, Ludovic; Turrini, Diego; Vandenbussche, Bart; Wolkenberg, Paulina; Beaulieu, Jean Philippe; Buchave, Lars A.; Ferus, Martin; Griffin, Matt; Guedel, Manuel; Justtanont, Kay; Lagage, Pierre Olivier; Machado, Pedro; Malaguti, Giuseppe; Min, Michiel; Nørgaard-Nielsen, Hans Ulrik; Rataj, Mirek; Ray, Tom; Ribas, Ignasi; Swain, Mark; Szabo, Robert; Werner, Stephanie; Barstow, Joanna; Burleigh, Matt; Cho, James; du Foresto, Vincent Coudé; Coustenis, Athena; Decin, Leen; Encrenaz, Therese; Galand, Marina; Gillon, Michael; Helled, Ravit; Morales, Juan Carlos; Muñoz, Antonio García; Moneti, Andrea; Pagano, Isabella; Pascale, Enzo; Piccioni, Giuseppe; Pinfield, David; Sarkar, Subhajit; Selsis, Franck; Jones, Hugh (2018-11-01)Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of ... -
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 ... -
Data processing and data products from 2017 to 2019 campaign of astronomical site testing at Ali, Daocheng and Muztagh-ata
Zihuang, Cao; Hao, Jin-Xin; Feng, Lu; Jones, Hugh; Li, Jian; Xu, Jing; Liu, Li-Yong; Song, Teng-Fei; Wang, Jian-Feng; Chen, Hua-Lin; Xue, Yan-Jie; Shen, Huang; Zhao, Yong-Heng (2020-06-01)Based on previous site testing and satellite cloud data, Ali, Daocheng and Muztagh-ata have been selected as candidate sites for the Large Optical/Infrared Telescope (LOT) in China. We present the data collection, processing, ... -
A detailed study of Lithium in 107 CHEPS dwarf stars
Pavlenko, Ya V.; Jenkins, J. S.; Ivanyuk, O. M.; Jones, Hugh; Kaminsky, B. M.; Lyubchik, Yu. P.; Yakovina, L. A. (2018-03-20)Context. We report results from lithium abundance determinations using high resolution spectral analysis of the 107 metal-rich stars from the Calan-Hertfordshire Extrasolar Planet Search programme. Aims. We aim to set out ... -
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 HD20782, with an orbital period of 597days and an ... -
EXOhSPEC collimator mechanical design
Kawinkija, Adipthep; Buisset, Christophe; Jones, Hugh; Martin, Bill; Errmann, Ronny (SPIE, 2019-09-09)The Exoplanet High-Resolution Spectrograph (EXOhSPEC) is a high-resolution spectrograph for the characterisation of exoplanets with the Thai National Telescope. The folded version of this instrument comprises one triplet ... -
EXOhSPEC folded design optimization and performance estimation
Lhospice, Esther; Buisset, Christophe; Jones, Hugh; Martin, Bill; Errmann, Ronny (SPIE, 2019-09-09)The EXOplanet high resolution SPECtrograph (EXOhSPEC) instrument is an echelle spectrograph dedicated to the detection of exoplanets by using the radial velocity method using 2m class telescopes. This spectrograph is ... -
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 ... -
HiFLEx – a highly flexible package to reduce cross-dispersed Echelle spectra
Errmann, Ronny; Cook, Neil; Jones, Hugh; Anglada Escude, Guillem; Sithajan, Sirinrat; Semenko, Eugene; Mkrtichian, David; Martin, Bill; Tanvir, Tabassum; Feng, F.; Collett, James (2020-06)We describe a flexible data reduction package for high resolution cross-dispersed echelle data. This open-source package is developed in Python and includes optional GUIs for most of the steps. It does not require any ... -
Highly replicable, low-cost, portable, general-purpose, high-resolution spectrometer with applications in stellar studies and exoplanet science
Baker, Clark; Anglada-Escude, Guillem; Jones, Hugh; Martin, Bill (SPIE, 2019-09-09)High-resolution spectrometers have proven to be an important tool for astronomical observations and continue to have an ever expanding set of applications, such as high resolution IFS (Integral Field Spectroscopy). With ... -
Incoherent light in tapered graded-index fibre: a study of transmission and modal noise
Choochalerm, Piyamas; Martin, Bill; Jones, Hugh; Usher, Sarah; Wright, Thomas; Yerolatsitis, Stephanos (2023-01-30)We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light ... -
Long-term analysis of clear nights using satellite data considering astronomical sites in western China
Zihuang, Cao; Qi, Zhaoxiang; Jones, Hugh (2020-06-01)A large ground-based optical/infrared telescope is being planned for a world-class astronomical site in China. The cloud-free night percentage is the primary meteorological consideration for evaluating candidate sites. The ... -
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 = ...