Doppler Surveys : Super-Earths And Neptune-type Planets.

Details Doppler Surveys : Super-Earths And Neptune-type Planets. Doppler Surveys : Super-Earths And Neptune-type Planets.

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0102m&link_type=abstract

American Astronomical Society, ESS meeting #2, #1.02

Astronomy and Astrophysics

Astronomy

Scientific paper

On the last 7 years a large survey has been carried out with the HARPS spectrograph at la Silla Observatory. An impressive population of low-mass planets with masses in the range of Super-Earths and Neptune-type planets, orbiting solar-type stars, has been discovered. Part of these planets have quite small masses (as small as 1.3 Earth-mass). An important fraction of these low-mass planets are part of multiplanetary systems as for example HD10180 with seven planets. If most of the detected Super-Earths are on tight orbits, already a few ones have been discovered in the habitable zone. These early discoveries of Super-Earths in the HZ confirm the possibility to detect by Doppler spectroscopy a significant list of stars with planets with suitable conditions for life development. Establishing a list of similar targets among our closest stellar neighbours is probably a prerequired condition for any future experiment designed to search for life signatures. The number of planetary systems with Super-Earths and Neptune-type planets is large enough to allow a first estimation of statistical properties of that subpopulation of planets (distributions of period, masses as well as the metallicity of their host stars).

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