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The HARPS search for southern extra-solar planets. XXXIV. A planetary system around the nearby M dwarf GJ163, with a super-Earth possibly in the habitable zone
Bonfils, X.; Lo Curto, G.; Correia, A. C. M. et al.
2013
 

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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] The meter-per-second precision achieved by today velocimeters enables the search for 1-10 M_Earth planets in the habitable zone of cool stars. This paper reports on the detection of 3 planets orbiting GJ163 (HIP19394), a M3 dwarf monitored by our ESO/HARPS search for planets. We made use of the HARPS spectrograph to collect 150 radial velocities of GJ163 over a period of 8 years. We searched the RV time series for coherent signals and found 5 distinct periodic variabilities. We investigated the stellar activity and casted doubts on the planetary interpretation for 2 signals. Before more data can be acquired we concluded that at least 3 planets are orbiting GJ163. They have orbital periods of P_b=8.632+-0.002, P_c=25.63+-0.03 and P_d=604+-8 days and minimum masses msini = 10.6+-0.6, 6.8+-0.9, and 29+-3 M_Earth, respectively. We hold our interpretations for the 2 additional signals with periods P_(e)=19.4 and P_(f)=108 days. The inner pair presents an orbital period ratio of 2.97, but a dynamical analysis of the system shows that it lays outside the 3:1 mean motion resonance. GJ163c, in particular, is a super-Earth with an equilibrium temperature of T_eq = (302+-10) (1-A)^(1/4) K and may lie in the so called habitable zone for albedo values (A=0.34-0.89) moderately higher than that of Earth (A_Earth=0.2-0.3).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bonfils, X.
Lo Curto, G.
Correia, A. C. M.
Laskar, J.
Udry, S.
Delfosse, X.
Forveille, T.
Astudillo-Defru, N.
Benz, W.
Bouchy, F.
Gillon, Michaël  ;  Université de Liège - ULiège
Hébrard, G.
Lovis, C.
Mayor, M.
Moutou, C.
Naef, D.
Neves, V.
Pepe, F.
Perrier, C.
Queloz, D.
Santos, N. C.
Ségransan, D.
More authors (12 more) Less
Language :
English
Title :
The HARPS search for southern extra-solar planets. XXXIV. A planetary system around the nearby M dwarf GJ163, with a super-Earth possibly in the habitable zone
Publication date :
01 June 2013
Commentary :
Astronomy & Astrophysics (accepted)
eprintid: arXiv:1306.0904
Available on ORBi :
since 04 July 2013

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