First Results from the CHEPS: Exoplanets and the Discovery of an Eccentric Brown Dwarf in the Desert
James S. Jenkins, Hugh R. A. Jones, Krzysztof Gozdziewski, Cezary Migaszewski, John R. Barnes, Matias I. Jones, Patricio Rojo, David J. Pinfield, Avril C. Day-Jones, Sergio Hoyer
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8 pages, 5 figures, 4 tables, Accepted for publication in MNRAS
We report the discovery of a brown dwarf on an eccentric orbit and with a semimajor axis that places it in the brown dwarf desert region around the star HD191760. The star has a spectral type of G3IV/V and a metallicity ([Fe/H]) of 0.29 dex. HD191760 adds to the small number of metal-rich stars with brown dwarf companions. The brown dwarf (HD191760b) is found to have an orbital period of 505.57+/-0.40 days and semimajor axis of 1.35+/-0.01 AU, placing it firmly in the brown dwarf desert. The eccentricity of HD191760b is found to be 0.63+/-0.01, meaning it reaches as close as 0.5 AU from the host star. Dynamical simulations indicate that no inner planets could reside at separations beyond ~0.17 AU due to the disastrous gravity imposed by HD191760b. In addition to these first results we also refine the orbits found for the exoplanets around the stars HD48265, HD143361 and HD154672. All 1-planet solutions are in agreement with those previously published by the Magellan Planet Search.
A universal brown dwarf desert formed between planets and stars
Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交大李政道研究所）；Department of Physics, University of Warwick（华威大学物理系）；Centre for Exoplanets and Habitability, University of Warwick（华威大学系外行星与宜居性中心）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；Institute for Astronomy, School of Physics, Zhejiang University（浙江大学物理学院天体物理研究所）；Center for Cosmology and Computational Astrophysics, Institute for Advanced Study in Physics, Zhejiang University（浙江大学物理学高等研究院宇宙学与计算天体物理中心）；School of Physics and Astronomy, University of Leicester（莱斯特大学物理与天文学院）；Department of Physics and Astronomy, The University of Georgia（佐治亚大学物理与天文系）；Center for Simulational Physics, The University of Georgia（佐治亚大学模拟物理中心）
Unraveling the Brown Dwarf Desert: Four New Discoveries and a Unifying, Period-Coded Picture
Czech Academy of Sciences（捷克科学院）；Harvard & Smithsonian（哈佛-史密森天体物理中心）；Universidad Adolfo Ibáñez（阿道夫·伊巴涅斯大学）；Millennium Institute for Astrophysics（天体物理学千年研究所）；Astronomical Institute of Charles University（查理大学天文研究所）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；The Ohio State University（俄亥俄州立大学）；University of Leicester（莱斯特大学）；Massachusetts Institute of Technology（麻省理工学院）；Sofia University “St Kliment Ohridski”（索非亚“圣克利门特·奥赫里德斯基”大学）
Gemini-GRACES high-quality spectra of Kepler evolved stars with transiting planets I. Detailed characterization of multi-planet systems Kepler-278 and Kepler-391
