Astrometry; Binaries: general; Planets and satellites: dynamical evolution and stability; Proper motions; Stars: fundamental parameters; Techniques: radial velocities; Binaries:general; Binary star; Brown dwarfs; Planets and satellites: dynamical evolution and stabilities; Proper motion; Radial velocity; Stars:fundamental parameters; Stellars; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.EP; astro-ph.SR
Abstract :
[en] Context. A historical search for exoplanets among a sample of 1647 nearby southern main sequence stars with the CORALIE spectrograph at La Silla Observatory has been underway since 1998, with a backup subprogram dedicated to the monitoring of binary stars. Aims. We reviewed 25 years of CORALIE measurements and search for Doppler signals consistent with stellar or brown dwarf companions to produce an updated catalog of both known and previously unpublished binary stars in the planet-search sample. We assessed the binarity fraction of the stellar population and survey the prospects for more precise searches for planets in the binary sample. Methods. We performed a new analysis on the CORALIE planet-search sample's radial velocity measurements, searching for stellar companions and obtaining orbital solutions for both known and new binary systems. We performed simultaneous radial velocity and proper motion anomaly fits on the subset of these systems for which HIPPARCOS and Gaia astrometry measurements are available, obtaining accurate estimates of true mass for the companions. Results. We found 218 stars in the CORALIE sample to have at least one stellar companion, 130 of which are not yet published in the literature and for which we present orbital solutions. The use of the proper motion anomaly allowed us to derive true masses for the stellar companions in 132 systems, which we additionally used to estimate stability regions for possible planetary companions on circumprimary or circumbinary orbits. Finally, we produced detection-limit maps for each star in the sample and obtained occurrence rates of 0.43-0.11+0.23% and 12.69-0.77+0.87% for brown dwarf and stellar companions, respectively, in the CORALIE sample.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Barbato, D.; Department of Astronomy, University of Geneva, Versoix, Switzerland ; INAF-Osservatorio Astrofisico di Torino, Pino Torinese, Italy
Ségransan, D.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Udry, S.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Unger, N.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Bouchy, F.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Lovis, C.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Mayor, M.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Pepe, F.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Queloz, D.; ETH Zurich, Department of Physics, Zurich, Switzerland ; Astrophysics Group, Cavendish Laboratory, Cambridge, United Kingdom
Santos, N.C.; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
Delisle, J.B.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Figueira, P.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Marmier, M.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Matthews, E.C.; Department of Astronomy, University of Geneva, Versoix, Switzerland ; Max-Planck-Institut für Astronomie, Heidelberg, Germany
Lo Curto, G.; European Southern Observatory, Santiago, Chile
Venturini, J.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Chaverot, G.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Cretignier, M.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Otegi, J.F.; Department of Astronomy, University of Geneva, Versoix, Switzerland
Stalport, Manu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Department of Astronomy, University of Geneva, Versoix, Switzerland
The authors wish to thank the referee, Dr. F. Kiefer, for the thorough and useful comments which significantly improved the quality of the manuscript. This work has been carried out within the framework of the National Centre of Competence in Research PlanetS supported by the Swiss National Science Foundation under grants 51NF40_182901 and 51NF40_205606. The authors acknowledge the financial support of the SNSF. The 120 cm EULER telescope and the CORALIE spectrograph were funded by the SNSF and the University of Geneva. This publication makes use of the Data & Analysis Center for Exoplanets (DACE), which is a facility based at the University of Geneva (CH) dedicated to extrasolar planets data visualisation, exchange and analysis. DACE is a platform of the Swiss National Centre of Competence in Research (NCCR) PlanetS, federating the Swiss expertise in Exoplanet research. The DACE platform is available at https://dace.unige.ch . N.C.S. acknowledges support from the European Research Council through the grant agreement 101052347 (FIERCE) and by FCT - Funda\u00E7\u00E3o para a Ci\u00EAncia e a Tecnologia through national funds and by FEDER through COMPETE2020 - Programa Operacional Competitividade e Internacionaliza-\u00E7\u00E3o by these grants: UIDB/04434/2020; UIDP/04434/2020. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. The authors made use of ASTROPY (a community-developed core Python package for Astronomy Astropy Collaboration 2013, 2018), MATPLOTLIB (Hunter 2007), NUMPY (Harris et al. 2020), SCIPY (Jones et al. 2001) and SEABORN (Waskom 2021). DB also wishes to thank N. Gaiman for his inspiring words about the illusion of permanence and stellar transience.
Commentary :
34 pages, 15 figures, accepted for publication in A&A
