Article (Scientific journals)
The HARPS-N Rocky Planet Search. I. HD 219134 b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun
Motalebi, F.; Udry, S.; Gillon, Michaël et al.
2015In Astronomy and Astrophysics, 584, p. 72
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Keywords :
techniques: radial velocities; techniques: photometric; stars: individual: HD 219134; binaries: eclipsing; instrumentation: spectrographs
Abstract :
[en] We know now from radial velocity surveys and transit space missions that planets only a few times more massive than our Earth are frequent around solar-type stars. Fundamental questions about their formation history, physical properties, internal structure, and atmosphere composition are, however, still to be solved. We present here the detection of a system of four low-mass planets around the bright (V = 5.5) and close-by (6.5 pc) star HD 219134. This is the first result of the Rocky Planet Search programme with HARPS-N on the Telescopio Nazionale Galileo in La Palma. The inner planet orbits the star in 3.0935 ± 0.0003 days, on a quasi-circular orbit with a semi-major axis of 0.0382 ± 0.0003 AU. Spitzer observations allowed us to detect the transit of the planet in front of the star making HD 219134 b the nearest known transiting planet to date. From the amplitude of the radial velocity variation (2.25 ± 0.22 ms[SUP]-1[/SUP]) and observed depth of the transit (359 ± 38 ppm), the planet mass and radius are estimated to be 4.36 ± 0.44 M[SUB]⊕[/SUB] and 1.606 ± 0.086 R[SUB]⊕[/SUB], leading to a mean density of 5.76 ± 1.09 g cm[SUP]-3[/SUP], suggesting a rocky composition. One additional planet with minimum-mass of 2.78 ± 0.65 M[SUB]⊕[/SUB] moves on a close-in, quasi-circular orbit with a period of 6.767 ± 0.004 days. The third planet in the system has a period of 46.66 ± 0.08 days and a minimum-mass of 8.94 ± 1.13 M[SUB]⊕[/SUB], at 0.233 ± 0.002 AU from the star. Its eccentricity is 0.46 ± 0.11. The period of this planet is close to the rotational period of the star estimated from variations of activity indicators (42.3 ± 0.1 days). The planetary origin of the signal is, however, thepreferred solution as no indication of variation at the corresponding frequency is observed for activity-sensitive parameters. Finally, a fourth additional longer-period planet of mass of 71 M[SUB]⊕[/SUB] orbits the star in 1842 days, on an eccentric orbit (e = 0.34 ± 0.17) at a distance of 2.56 AU. The photometric time series and radial velocities used in this work are available in electronic form at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/584/A72">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/584/A72</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Motalebi, F.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Udry, S.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Gillon, Michaël  ;  Université de Liège - ULiège
Lovis, C.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Ségransan, D.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Buchhave, L. A.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA ; Centre for Stars and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, 1350, Copenhagen, Denmark
Demory, B. O.;  Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK
Malavolta, L.;  Dipartimento di Fisica e Astronomia "Galileo Galilei", Universita di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy ; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Dressing, C. D.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Sasselov, D.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Rice, K.;  SUPA, Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh, EH93, HJ, UK
Charbonneau, D.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Collier Cameron, A.;  SUPA, School of Physics & Astronomy, University of St. Andrews, North Haugh, St. Andrews Fife, KY16 9SS, UK
Latham, D.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Molinari, E.;  INAF-Fundación Galileo Galilei, Rambla José Ana Fernandez Pérez 7, 38712, Berña Baja, Spain ; INAF-IASF Milano, via Bassini 15, 20133, Milano, Italy
Pepe, F.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Affer, L.;  INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134, Palermo, Italy
Bonomo, A. S.;  INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy
Cosentino, R.;  INAF-Fundación Galileo Galilei, Rambla José Ana Fernandez Pérez 7, 38712, Berña Baja, Spain
Dumusque, X.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Figueira, P.;  Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal
Fiorenzano, A. F. M.;  INAF-Fundación Galileo Galilei, Rambla José Ana Fernandez Pérez 7, 38712, Berña Baja, Spain
Gettel, S.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Harutyunyan, A.;  INAF-Fundación Galileo Galilei, Rambla José Ana Fernandez Pérez 7, 38712, Berña Baja, Spain
Haywood, R. D.;  SUPA, School of Physics & Astronomy, University of St. Andrews, North Haugh, St. Andrews Fife, KY16 9SS, UK
Johnson, J.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Lopez, E.;  SUPA, Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh, EH93, HJ, UK
Lopez-Morales, M.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Mayor, M.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Micela, G.;  INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134, Palermo, Italy
Mortier, A.;  Université de Liège > Département de droit > Droit social
Nascimbeni, V.;  INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Philips, D.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Piotto, G.;  Dipartimento di Fisica e Astronomia "Galileo Galilei", Universita di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy ; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Pollacco, D.;  Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
Queloz, D.;  Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland ; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK
Sozzetti, A.;  INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy
Vanderburg, A.;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts, 02138, USA
Watson, C. A.;  Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK)
More authors (29 more) Less
Language :
English
Title :
The HARPS-N Rocky Planet Search. I. HD 219134 b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun
Publication date :
01 December 2015
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
584
Pages :
72
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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