Planet Detectability in the Alpha Centauri System

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dc.contributor.authorZhao, L.
dc.contributor.authorFischer, D.A.
dc.contributor.authorBrewer, J.
dc.contributor.authorGiguere, M.
dc.contributor.authorRojas-Ayala, B.
dc.date.accessioned2018-07-23T20:12:51Z
dc.date.available2018-07-23T20:12:51Z
dc.date.issued2018
dc.descriptionIndexación: Scopus.es_ES
dc.description.abstractWe use more than a decade of radial-velocity measurements for α Cen A, B, and Proxima Centauri from the High Accuracy Radial Velocity Planet Searcher, CTIO High Resolution Spectrograph, and the Ultraviolet and Visual Echelle Spectrograph to identify the M i sin and orbital periods of planets that could have been detected if they existed. At each point in a mass-period grid, we sample a simulated, Keplerian signal with the precision and cadence of existing data and assess the probability that the signal could have been produced by noise alone. Existing data places detection thresholds in the classically defined habitable zones at about M i sin of 53 M· for a Cen A, 8.4 M· for a Cen B, and 0.47 M· for Proxima Centauri. Additionally, we examine the impact of systematic errors, or "red noise" in the data. A comparison of white- and red-noise simulations highlights quasi-periodic variability in the radial velocities that may be caused by systematic errors, photospheric velocity signals, or planetary signals. For example, the red-noise simulations show a peak above white-noise simulations at the period of Proxima Centauri b. We also carry out a spectroscopic analysis of the chemical composition of the a Centauri stars. The stars have supersolar metallicity with ratios of C/O and Mg/Si that are similar to the Sun, suggesting that any small planets in the a Cen system may be compositionally similar to our terrestrial planets. Although the small projected separation of a Cen A and B currently hampers extreme-precision radial-velocity measurements, the angular separation is now increasing. By 2019, a Cen A and B will be ideal targets for renewed Doppler planet surveys.es_ES
dc.description.urihttp://iopscience.iop.org/article/10.3847/1538-3881/aa9bea/meta
dc.identifier.citationAstronomical Journal. Volume 155, Issue 1, January 2018, Article number 24es_ES
dc.identifier.issn0004-6256
dc.identifier.otherDOI: 10.3847/1538-3881/aa9bea
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/6357
dc.language.isoenes_ES
dc.publisherInstitute of Physics Publishinges_ES
dc.subjectPlanetary systemses_ES
dc.subjectPlanets and satellites: detectiones_ES
dc.subjectStars: fundamental parameterses_ES
dc.subjectStars: individual (Alpha Centauri)es_ES
dc.subjectTechniques: radial velocitieses_ES
dc.titlePlanet Detectability in the Alpha Centauri Systemes_ES
dc.typeArtículoes_ES
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