J/A+A/614/A133 Radial velocities of HD215152 (Delisle+, 2018)
The HARPS search for southern extra-solar planets.
XLIII. A compact system of four super-earth planets orbiting HD215152.
Delisle J.-B., Segransan 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.
<Astron. Astrophys. 614, A133 (2018)>
=2018A&A...614A.133D 2018A&A...614A.133D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities ;
Exoplanets
Keywords: planetary systems - planets and satellites: general -
planets and satellites: detection -
planets and satellites: dynamical evolution and stability
Abstract:
We report the discovery of four super-earth planets around HD215152,
with orbital periods of 5.76, 7.28, 10.86, and 25.2d, and minimum
masses of 1.8, 1.7, 2.8, and 2.9MEarth respectively.
This discovery is based on 373 high quality radial velocity
measurements taken by HARPS over thirteen years. Given the low masses
of the planets, the S/N is not sufficient to constrain the planets
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 smaller than 1.5, with short orbital periods, small masses, and
small eccentricities, HD215152 is similar to the very compact
multi-planet systems found by Kepler, and very rare in RV surveys.
This discovery proves that those systems are reachable with the RV
technique, however they require a huge amount of observations to be
characterized.
Description:
HD215152 radial velocity and log(R'hk) measurements obtained with the
HARPS spectrograph installed at the 3.6-m telescope at La Silla
observatory.
Objects:
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RA (2000) DE Designation(s)
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22 43 21.30 -06 24 03.0 HD 215152 = HIP 112190
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
harps_a.dat 45 284 HARPS measurements of HD215152 taken before
the fiber upgrade
harps_b.dat 45 89 HARPS measurements of HD215152 taken after
the fiber upgrade
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Byte-by-byte Description of file: harps_a.dat harps_b.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian Date of observation
(BJD-2400000)
14- 22 F9.5 km/s RV Radial velocity
24- 30 F7.5 km/s e_RV Radial velocity uncertainty
32- 38 F7.4 --- logRhk Activity indicator based on CaII HK
40- 45 F6.4 --- e_logRhk Uncertainty in the log(R'hk) measurement
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Acknowledgements:
Jean-Baptiste Delisle, jean-baptiste.delisle(at)unige.ch
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(End) J.-B. Delisle [UNIGE, Switzerland], P. Vannier [CDS] 12-Feb-2018