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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 | | X. Bonfils
; G. Lo Curto
; A. C. M. Correia
; J. Laskar
; S. Udry
; X. Delfosse
; T. Forveille
; N. Astudillo-Defru
; W. Benz
; F. Bouchy
; M. Gillon
; G. Hébrard
; C. Lovis
; M. Mayor
; C. Moutou
; D. Naef
; V. Neves
; F. Pepe
; C. Perrier
; D. Queloz
; N. C. Santos
; D. Ségransan
; | | Date: |
4 Jun 2013 | | Abstract: | 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). | | Source: | arXiv, 1306.0904 | | Services: | Forum | Review | PDF | Favorites | |
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