Bibcode
Udry, S.; Dumusque, X.; Lovis, C.; Ségransan, D.; Diaz, R. F.; Benz, W.; Bouchy, F.; Coffinet, A.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Pepe, F.; Queloz, D.; Santos, N. C.; Wyttenbach, A.; Alonso, R.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Moutou, C.; Pollacco, D.; Pompei, E.
Bibliographical reference
Astronomy and Astrophysics, Volume 622, id.A37, 29 pp.
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2
2019
Journal
Citations
50
Refereed citations
45
Description
Context. We present radial-velocity measurements of eight stars observed
with the HARPS Echelle spectrograph mounted on the 3.6-m telescope in La
Silla (ESO, Chile). Data span more than ten years and highlight the
long-term stability of the instrument. Aims: We search for
potential planets orbiting HD 20003, HD 20781, HD 21693, HD 31527, HD
45184, HD 51608, HD 134060 and HD 136352 to increase the number of known
planetary systems and thus better constrain exoplanet statistics.
Methods: After a preliminary phase looking for signals using generalized
Lomb-Scargle periodograms, we perform a careful analysis of all signals
to separate bona-fide planets from signals induced by stellar activity
and instrumental systematics. We finally secure the detection of all
planets using the efficient MCMC available on the Data and Analysis
Center for Exoplanets (DACE web-platform), using model comparison
whenever necessary. Results: In total, we report the detection of
twenty new super-Earth to Neptune-mass planets, with minimum masses
ranging from 2 to 30 MEarth and periods ranging from 3 to
1300 days, in multiple systems with two to four planets. Adding CORALIE
and HARPS measurements of HD20782 to the already published data, we also
improve the characterization of the extremely eccentric Jupiter orbiting
this visual companion of HD 20781.
Based on observations made with the HARPS instrument on the ESO 3.6 m
telescope at La Silla Observatory under the GTO program 072.C-0488 and
Large program 193.C-0972/193.C-1005/.The analysis of the radial-velocity
measurements were performed using the Data and Analysis Center for
Exoplanets (DACE) developed in the frame of the Swiss NCCR PlanetS and
available for the community at the following address: http://https://dace.unige.ch/.RV data
are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/622/A37.
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The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
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