Browsing by Author "Jenkins, James Stewart"
Now showing items 1-20 of 37
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(EDP Sciences, 2015)Context. In a previous paper we reported a planetary companion to the young and very active K5Ve star BD+20 1790. We found that this star has a high level of stellar activity (log R HK = −3.7) that manifests in a plethora ...
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(Oxford University Press, 2014)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, ...
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(WILEY-BLACKWELL, 2012-03)We present new ages and abundance measurements for the pre-main-sequence star PZ Telescopii (more commonly known as PZ Tel). PZ Tel was recently found to host a young and low-mass companion. Such companions, whether they ...
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(Oxford University Press, 2014)A method is defined for identifying late-T and Y dwarfs in WISE down to low values of signalto- noise. This requires a WISE detection only in theW2-band and uses the statistical properties of the WISE multiframe measurements ...
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(Institute of Physics Publishing, 2019)We describe a new method to derive clean, iodine-free spectra directly from observations acquired using high-resolution echelle spectrographs equipped with iodine cells. The main motivation to obtain iodine-free spectra ...
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(Oxford University Press, 2019)We present the detection of an energetic flare on the pre-main-sequence M3 star NGTS J121939.5–355557, which we estimate to be only 2 Myr old. The flare had an energy of 3.2 ±0 0 4 3 ×1036 erg and a fractional amplitude ...
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(2013)Aims. Our understanding of magnetic fields in late-type stars is strongly driven by what we know of the solar magnetic field. For this reason, it is crucial to understand how typical the solar dynamo is. To do this we ...
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(WILEY-BLACKWELL, 2011-01)We present the discovery of the first T dwarf + white dwarf binary system LSPM 1459+0857 AB, confirmed through common proper motion and spectroscopy. The white dwarf is a high proper motion object from the LSPM catalogue ...
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A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone (EDP Sciences, 2013-08)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 ...
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(Universidad de Chile, 2013)A la fecha mas de 800 exoplanetas han sido detectados, la mayoría de ellos mediante el método de velocidad radial (VR). De forma tal de obtener VR's precisas, el espectro estelar debe contener miles de lineas de absorción ...
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(EDP Sciences, 2015)Context. Precision radial velocities are required to discover and characterize exoplanets. Optical spectra that exhibit many hundreds of absorption lines can allow the m s(-1) precision levels required for this work. After ...
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(Montlhy Notices of The Royal Society Astronomy, 2014-04-04)The hunt for Earth analogue planets orbiting Sun-like stars has forced the introduction of novel methods to detect signals at, or below, the level of the intrinsic noise of the observations. We present a new global ...
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(2010)The Doppler wobble induced by the extra-solar planet HD 134987b was first detected by data from the Keck Telescope nearly a decade ago, and was subsequently confirmed by data from the Anglo-Australian Telescope (AAT). ...
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(Oxford Univ Press, England, 2021)Long-term stellar activity variations can affect the detectability of long-period and Earth-analogue extrasolar planets. We have, for 54 stars, analysed the long-term trend of five activity indicators: logR HK, the ...
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(Oxford University, 2017)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 aspart of the Calan–Hertfordshire Extrasolar ...
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(Oxford University Press, 2021)We present the discovery of NGTS-19b, a high-mass transiting brown dwarf discovered by the Next Generation Transit Survey. We investigate the system using follow-up photometry from the South African Astronomical Observatory, ...
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(Oxford University Press, 2019)We report the discovery of NGTS-4b, a sub-Neptune-sized planet transiting a 13th magnitude K-dwarf in a 1.34 d orbit. NGTS-4b has a mass M = 20.6 ± 3.0M⊕ and radius R = 3.18 ± 0.26 R⊕, which places it well within the ...
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(ESO, 2014)Context. The recent discovery of three giant planets orbiting the extremely metal-poor stars HIP 11952 and HIP 13044 have challenged theoretical predictions of the core-accretion model. According to this, the metal content ...
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(Oxford University Press, 2015)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 ...
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(IOP PUBLISHING, 2016)We report the discovery of two giant planets orbiting the K giant HD 33844 based on radial velocity data from three independent campaigns. The planets move on nearly circular orbits with semimajor axes a(b) = 1.60 +/- 0.02 ...
