2006A&A...447..361U


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.23CET00:57:11

2006A&A...447..361U - Astronomy and Astrophysics, volume 447, 361-367 (2006/2-3)

The HARPS search for southern extra-solar planets. V. A 14 Earth-masses planet orbiting HD 4308.

UDRY S., MAYOR M., BENZ W., BERTAUX J.-L., BOUCHY F., LOVIS C., MORDASINI C., PEPE F., QUELOZ D. and SIVAN J.-P.

Abstract (from CDS):

We present here the discovery and characterisation of a very light planet around HD4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a tiny semi-amplitude of 4.1m/s that corresponds to a planetary minimum mass m2sini=14.1M (Earth masses). The planet was unveiled by high-precision radial-velocity measurements obtained with the HARPS spectrograph on the ESO 3.6-m telescope. The radial-velocity residuals around the Keplerian solution are 1.3m/s, demonstrating the very high quality of the HARPS measurements. Activity and bisector indicators exclude any significant perturbations of stellar intrinsic origin, which supports the planetary interpretation. Contrary to most planet-host stars, HD4308 has a marked sub-solar metallicity ([Fe/H]=-0.31), raising the possibility that very light planet occurrence might show a different coupling with the parent star's metallicity than do giant gaseous extra-solar planets. Together with Neptune-mass planets close to their parent stars, the new planet occupies a position in the mass-separation parameter space that is constraining for planet-formation and evolution theories. The question of whether they can be considered as residuals of evaporated gaseous giant planets, ice giants, or super-earth planets is discussed in the context of the latest core-accretion models.

Abstract Copyright:

Journal keyword(s): stars: individual: HD4308 - methods: observational - techniques: radial velocities - techniques: spectroscopic - instrumentation: spectrographs

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 4308 PM* 00 44 39.2675256910 -65 38 58.282490370 7.31 7.193 6.552     G6VFe-0.9 222 1
2 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 990 1
3 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 627 1
4 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 549 2
5 BD-07 4003b Pl 15 19 26.8271336166 -07 43 20.190958776           ~ 73 1
6 * mu. Ara c Pl 17 44 08.7036342277 -51 50 02.591049123           ~ 76 2
7 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 477 2
8 HD 190360c Pl 20 03 37.4049065078 +29 53 48.495330996           ~ 42 1
9 BD-15 6290d Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 135 1

    Equat.    Gal    SGal    Ecl

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2021.01.23-00:57:11

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