No planet for HD 166435
Didier Queloz,Gregory W. Henry,Jean-Pierre Sivan,Sallie L. Baliunas,J. L. Beuzit,R. A. Donahue M. Mayor,Dominique Naef,C. Perrier,Stéphane Udry +8 more
TLDR
In this paper, the G0V star HD166435 has been observed by the fiber-fed spectrograph ELODIE as one of the targets in the large extra-solar planet survey that is conducting at the Observatory of Haute-Provence.Abstract:
The G0V star HD166435 has been observed by the fiber-fed spectrograph ELODIE as one of the targets in the large extra-solar planet survey that we are conducting at the Observatory of Haute-Provence. We detected coherent, low-amplitude, radial-velocity variations with a period of 3.7987days, suggesting a possible close-in planetary companion. Subsequently, we initiated a series of high-precision photometric observations to search for possible planetary transits and an additional series of CaII H and K observations to measure the level of surface magnetic activity and to look for possible rotational modulation. Surprisingly, we found the star to be photometrically variable and magnetically active. A detailed study of the phase stability of the radial-velocity signal revealed that the radial-velocity variability remains coherent only for durations of about 30days. Analysis of the time variation of the spectroscopic line profiles using line bisectors revealed a correlation between radial velocity and line-bisector orientation. All of these observations, along with a one-quarter cycle phase shift between the photometric and the radial-velocity variationss, are well explained by the presence of dark photospheric spots on HD166435. We conclude that the radial-velocity variations are not due to gravitational interaction with an orbiting planet but, instead, originate from line-profile changes stemming from star spots on the surface of the star. The quasi-coherence of the radial-velocity signal over more than two years, which allowed a fair fit with a binary model, makes the stability of this star unusual among other active stars. It suggests a stable magnetic field orientation where spots are always generated at about the same location on the surface of the star.read more
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A terrestrial planet candidate in a temperate orbit around Proxima Centauri
Guillem Anglada-Escudé,Pedro J. Amado,John R. Barnes,Z. M. Berdiñas,R. Paul Butler,Gavin A. L. Coleman,Ignacio de la Cueva,Stefan Dreizler,Michael Endl,Benjamin Giesers,Sandra V. Jeffers,James S. Jenkins,Hugh R. A. Jones,Marcin Kiraga,Martin Kürster,Marίa J. López-González,Christopher Marvin,Nicolás Morales,Julien Morin,Richard P. Nelson,Jose Luis Ortiz,Aviv Ofir,Sijme-Jan Paardekooper,Ansgar Reiners,E. Rodriguez,Cristina Rodrίguez-López,L. F. Sarmiento,J. B. P. Strachan,Yiannis Tsapras,Mikko Tuomi,Mathias Zechmeister +30 more
TL;DR: Observations reveal the presence of a small planet with a minimum mass of about 1.3 Earth masses orbiting Proxima with a period of approximately 11.2 days at a semi-major-axis distance of around 0.05 astronomical units.
Journal ArticleDOI
Catalog of nearby exoplanets
R. P. Butler,Jason T. Wright,Geoffrey W. Marcy,Geoffrey W. Marcy,Debra A. Fischer,Debra A. Fischer,Steven S. Vogt,C. G. Tinney,Hugh R. A. Jones,Brad D. Carter,John Asher Johnson,Chris McCarthy,Chris McCarthy,Alan J. Penny,Alan J. Penny +14 more
TL;DR: In this article, the authors present a catalog of nearby exoplanets, which contains the 172 known low-mass companions with orbits established through radial velocity and transit measurements around stars within 200 pc, including five previously unpublished ex-oplanets orbiting the stars HD 11964, HD 66428, HD 99109, HD 107148 and HD 164922.
Journal ArticleDOI
The HARPS search for southern extra-solar planets - XXXI. The M-dwarf sample
Xavier Bonfils,X. Delfosse,Stéphane Udry,T. Forveille,Michel Mayor,C. Perrier,François Bouchy,Michaël Gillon,Christophe Lovis,Francesco Pepe,Didier Queloz,Nuno C. Santos,Damien Ségransan,Jean-Loup Bertaux +13 more
TL;DR: In this paper, the authors used a fraction of the guaranteed time on the ESO/HARPS spectrograph to estimate the radial velocities of 102 southern nearby M dwarfs, and then applied systematic searches for long-term trends, periodic signals, and Keplerian orbits.
Journal ArticleDOI
The stellar activity-rotation relationship and the evolution of stellar dynamos
TL;DR: In this article, a sample of 824 solar and late-type stars with X-ray luminosities and rotation periods was used to study the relationship between rotation and stellar activity and derive a new estimate of the convective turnover time.
Journal ArticleDOI
Kepler 's First Rocky Planet: Kepler-10b
Natalie M. Batalha,William J. Borucki,Stephen T. Bryson,Lars A. Buchhave,Douglas A. Caldwell,Jørgen Christensen-Dalsgaard,Jørgen Christensen-Dalsgaard,David R. Ciardi,Edward W. Dunham,Francois Fressin,Thomas N. Gautier,Ronald L. Gilliland,Michael R. Haas,Steve B. Howell,Jon M. Jenkins,Hans Kjeldsen,David G. Koch,David W. Latham,Jack J. Lissauer,Geoffrey W. Marcy,Jason F. Rowe,Dimitar Sasselov,Sara Seager,Jason H. Steffen,Guillermo Torres,Gibor Basri,Timothy M. Brown,David Charbonneau,Jessie L. Christiansen,Bruce D. Clarke,William D. Cochran,Andrea K. Dupree,Daniel C. Fabrycky,Debra A. Fischer,Eric B. Ford,Jonathan J. Fortney,Forrest R. Girouard,Matthew J. Holman,John Asher Johnson,Howard Isaacson,Todd C. Klaus,P. Machalek,Althea V. Moorehead,Robert C. Morehead,Darin Ragozzine,Peter Tenenbaum,Joseph D. Twicken,Samuel N. Quinn,J. VanCleve,Lucianne M. Walkowicz,William F. Welsh,Edna DeVore,Alan Gould +52 more
TL;DR: The first Earth-size exoplanet was discovered by NASA's Kepler mission as discussed by the authors, which used transit photometry to determine the frequency of Earthsize planets in or near the habitable zone of Sun-like stars.
References
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Protostars and Planets VI
TL;DR: Protostars and Planets VI brings together more than 250 contributing authors at the forefront of their field, conveying the latest results in this research area and establishing a new foundation for advancing our understanding of stellar and planetary formation as mentioned in this paper.