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18 April 2024 |
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The HARPS search for southern extra-solar planets. XLIII. A compact system of four super-Earth planets orbiting HD 215152 | | J.-B. Delisle
; D. Ségransan
; X. Dumusque
; R.F. Diaz
; F. Bouchy
; C. Lovis
; F. Pepe
; S. Udry
; R. Alonso
; W. Benz
; A. Coffinet
; A. Collier Cameron
; M. Deleuil
; P. Figueira
; M. Gillon
; G. Lo Curto
; M. Mayor
; C. Mordasini
; F. Motalebi
; C. Moutou
; D. Pollacco
; E. Pompei
; D. Queloz
; N.C. Santos
; A. Wyttenbach
; | | Date: |
13 Feb 2018 | | Abstract: | We report the discovery of four super-Earth planets around HD 215152, with
orbital periods of 5.76, 7.28, 10.86, and 25.2 d, and minimum masses of 1.8,
1.7, 2.8, and 2.9 M_Earth respectively. This discovery is based on 373
high-quality radial velocity measurements taken by HARPS over 13 years. Given
the low masses of the planets, the signal-to-noise ratio is not sufficient to
constrain the planet eccentricities. However, a preliminary dynamical analysis
suggests that eccentricities should be typically lower than about 0.03 for the
system to remain stable. With two pairs of planets with a period ratio lower
than 1.5, with short orbital periods, low masses, and low eccentricities, HD
215152 is similar to the very compact multi-planet systems found by Kepler,
which is very rare in radial-velocity surveys. This discovery proves that these
systems can be reached with the radial-velocity technique, but characterizing
them requires a huge amount of observations. | | Source: | arXiv, 1802.4631 | | Services: | Forum | Review | PDF | Favorites | |
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