The HARPS search for Earth-like planets in the habitable zone - I. Very low-mass planets around HD 20794, HD 85512, and HD 192310
Francesco Pepe,Christophe Lovis,Damien Ségransan,Willy Benz,François Bouchy,François Bouchy,Xavier Dumusque,Michel Mayor,Didier Queloz,Nuno C. Santos,Stéphane Udry +10 more
TLDR
In this paper, the HARPS-Upgrade GTO program was used to collect very precise radial velocity data with high cadence and continuity to detect tiny signatures of very low-mass stars that are potentially present in the habitable zone of their parent stars.Abstract:
Context. In 2009 we started an intense radial-velocity monitoring of a few nearby, slowly-rotating and quiet solar-type stars within the dedicated HARPS-Upgrade GTO program.Aims. The goal of this campaign is to gather very-precise radial-velocity data with high cadence and continuity to detect tiny signatures of very-low-mass stars that are potentially present in the habitable zone of their parent stars.Methods. Ten stars were selected among the most stable stars of the original HARPS high-precision program that are uniformly spread in hour angle, such that three to four of them are observable at any time of the year. For each star we recorded 50 data points spread over the observing season. The data points consist of three nightly observations with a total integration time of 10 min each and are separated by two hours. This is an observational strategy adopted to minimize stellar pulsation and granulation noise.Results. We present the first results of this ambitious program. The radial-velocity data and the orbital parameters of five new and one confirmed low-mass planets around the stars HD 20794, HD 85512, and HD 192310 are reported and discussed, among which is a system of three super-Earths and one that harbors a 3.6 M ⊕ -planet at the inner edge of the habitable zone. Conclusions. This result already confirms previous indications that low-mass planets seem to be very frequent around solar-type stars and that this may occur with a frequency higher than 30%.read more
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Habitable Zones Around Main-Sequence Stars: New Estimates
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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
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The GALAH survey: scientific motivation
G. M. De Silva,G. M. De Silva,Kenneth C. Freeman,Joss Bland-Hawthorn,Sarah L. Martell,E. Wylie de Boer,Martin Asplund,Stefan Keller,Sanjib Sharma,Daniel B. Zucker,Tomaž Zwitter,Borja Anguiano,Carlos Bacigalupo,Daniel Bayliss,M.A. Beavis,Maria Bergemann,Simon Campbell,Russell D. Cannon,Daniela Carollo,Luca Casagrande,Andrew R. Casey,G. S. Da Costa,Valentina D'Orazi,Valentina D'Orazi,Aaron Dotter,Ly Duong,Alexander Heger,Alexander Heger,Alexander Heger,Michael J. Ireland,Prajwal R. Kafle,Janez Kos,John C. Lattanzio,Geraint F. Lewis,J. Lin,Karin Lind,Ulisse Munari,David M. Nataf,Simon J. O'Toole,Quentin A. Parker,Warren A. Reid,Katharine J. Schlesinger,Andrew I. Sheinis,Jeffrey D. Simpson,Dennis Stello,Yuan-Sen Ting,Gregor Traven,Fred G. Watson,Robert A. Wittenmyer,David Yong,M. Žerjal +50 more
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Habitable zones around main-sequence stars: Dependence on planetary mass
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References
More filters
Astronomical Society of the Pacific Conference Series
P. Serra,Raffaella Morganti,Tom Oosterloo,K. Alatalo,L. Blitz,M. Bois,R. C. E. van den Bosch,Frederic Bournaud,Martin Bureau,M. Cappellari,R. L. Davies,Timothy A. Davis,Pierre-Alain Duc,E. Emsellem,Jesús Falcón-Barroso,Sadegh Khochfar,D. Krajnovic,H. Kuntschner,P. Y. Lablanche,Richard M. McDermid,T. Naab,Marc Sarzi,N. Scott,G. de Ven,Anne-Marie Weijmans,Lisa M. Young,P. T. de Zeeuw +26 more
TL;DR: McHardy et al. as discussed by the authors presented a workshop at theCrimean Astrophysical Observatory, Crimea, Ukraine, 14-16 June 2004, which was held at the University of Southampton, United Kingdom.
Journal ArticleDOI
Accurate masses and radii of normal stars: Modern results and applications
TL;DR: In this paper, the authors present a critical compilation of accurate, fundamental determinations of stellar masses and radii, including stellar luminosity, effective temperature, metal abundance, and apsidal motion determinations.
Journal ArticleDOI
Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
TL;DR: In this article, the authors derived an improved activity-age calibration for F7-K2 dwarfs (0:5 mag < B -V < 0.9 mag).
Journal Article
Setting New Standards with HARPS
Michel Mayor,Francesco Pepe,Didier Queloz,François Bouchy,Gero Rupprecht,G. Lo Curto,G. Avila,Willy Benz,Jean-Loup Bertaux,X. Bonfils,T. H. Dall,Hans Dekker,B. Delabre,W. Eckert,M. Fleury,Alain Gilliotte,D. Gojak,J. C. Guzman,D. Kohler,J. L. Lizon,Antonio Longinotti,Christophe Lovis,Denis Mégevand,Luca Pasquini,Javier Reyes,Jean-Pierre Sivan,Danuta Sosnowska,Raimundo Soto,Stéphane Udry,A. van Kesteren,L. Weber,U. Weilenmann +31 more