The HARPS search for southern extra-solar planets. V. A 14 Earth-masses planet orbiting HD\thinsp4308

Udry, S.; Mayor, M.; Benz, W.; Bertaux, J.-L.; Bouchy, F.; Lovis, C.; Mordasini, C.; Pepe, F.; Queloz, D.; Sivan, J.-P. (2006). The HARPS search for southern extra-solar planets. V. A 14 Earth-masses planet orbiting HD\thinsp4308. Astronomy and astrophysics, 447(1), pp. 361-367. Les Ulis: EDP Sciences 10.1051/0004-6361:20054084

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We present here the discovery and characterisation of a very light planet around HD 4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a tiny semi-amplitude of 4.1 m s-1 that corresponds to a planetary minimum mass = 14.1 (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 1.3 m s-1, 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, HD 4308 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Benz, Willy, Mordasini, Christoph

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:50

Last Modified:

14 Mar 2023 15:22

Publisher DOI:

10.1051/0004-6361:20054084

Web of Science ID:

000234957400033

BORIS DOI:

10.48350/20805

URI:

https://boris.unibe.ch/id/eprint/20805 (FactScience: 4575)

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