The HARPS search for southern extra-solar planets: XLIII. A compact system of four super-Earth planets orbiting HD 215152

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 · respectively. This discovery is based on 373 high-quality radial velocity measurements taken by HARPS over 13 yr. Given the lo...

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Detalles Bibliográficos
Autores principales: Delisle, J.-B., Ségransan, D., Dumusque, X., Diaz, R.F., Bouchy, F., Lovis, C., Pepe, F., Udry, S., Alonso, R., Benz, W., Coffinet, A., Collier Cameron, A., Deleuil, M., Figueira, P., Gillon, M., Lo Curto, G., Mayor, M., Mordasini, C., Motalebi, F., Moutou, C., Pollacco, D., Pompei, E., Queloz, D., Santos, N.C., Wyttenbach, A.
Formato: JOUR
Materias:
Planets and satellites: detection
Planets and satellites: dynamical evolution and stability
Planets and satellites: general
Extrasolar planets
Satellites
Signal to noise ratio
Compact system
Dynamical analysis
Orbital periods
Planets and satellites: detections
Planets and satellites: dynamical evolution and stabilities
Radial velocity
Radial velocity measurements
Orbits
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v614_n_p_Delisle
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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 · respectively. This discovery is based on 373 high-quality radial velocity measurements taken by HARPS over 13 yr. 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. © 2018 ESO.

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