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dc.contributor.authorTuomi, Mikko
dc.contributor.authorKotiranta, S.
dc.contributor.authorKaasalainen, M.
dc.date.accessioned2017-03-09T17:41:44Z
dc.date.available2017-03-09T17:41:44Z
dc.date.issued2009-02
dc.identifier.citationTuomi , M , Kotiranta , S & Kaasalainen , M 2009 , ' The complementarity of astrometrie and radial velocity exoplanet observations: Determining exoplanet mass with astrometric snapshots ' , Astronomy and Astrophysics , vol. 494 , no. 2 , pp. 769-774 . https://doi.org/10.1051/0004-6361:200810288
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 11129862
dc.identifier.otherPURE UUID: f325fe3e-299c-41fe-990e-5e5411f5de0e
dc.identifier.otherScopus: 59649090485
dc.identifier.urihttp://hdl.handle.net/2299/17706
dc.descriptionM. Tuomi, S. Kotiranta, ad M. Kaasalainen, 'The complementarity of astrometric and radial velocity exoplanet observations: Determining exoplanet mass with astrometric snapshots', Astronomy & Astrophysics, Vol. 494 (2): 769-774, first published online 11 December 2008. The version of record is available at doi: https://doi.org/10.1051/0004-6361:200810288 © ESO 2009 Published by EDP Sciences
dc.description.abstractAims. It is commonly assumed that the two indirect exoplanet detection methods, the radial velocity method and astrometric method, require observational periods exceeding the orbital period to produce positive results. Here we test this assumption in detail. We also investigate the smallest ratio of observational timeline and orbital period required for positive detections. Methods. We obtain full information on the orbital parameters by combining radial-velocity and astrometric measurements by means of Bayesian inference, and sample the parameter probability densities of orbital and other model parameters with a Markov Chain Monte Carlo (MCMC) method in simulated observational scenarios to test the detectability of planets with orbital periods longer than the observational timelines. Results. We show that, when fitting model parameters simultaneously to measurements from both sources, it is possible to extract much more information from the measurements than when using either source alone. Currently available high-precision measurements of radial velocity (with 1 ms-1 precision) and astrometric measurements achievable with the SIM space telescope (with a precision of 1 μas) can be used together to detect a Jupiter analog 30 pc away with an observational timeline of only three years, approximately one fourth of the orbital period. Such measurements are sufficient for determining all its orbital parameters, including inclination and the true mass. Also, with accurate radial velocity measurements covering a timeline of 20 years, the true mass could be determined by astrometric observations within a single year. These case studies demonstrate the potential power of the Bayesian inference of multiple data sources in exoplanet observations. As an example, we show that using the currently available radial velocity measurements, the inclination of HD 154345b could be determined with SIM in a year.en
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofAstronomy and Astrophysics
dc.rights/dk/atira/pure/core/openaccesspermission/open
dc.subjectAstrometry
dc.subjectMethods: Statistical
dc.subjectPlanetary systems
dc.subjectStars: Individual: HD 154345
dc.subjectTechniques: Radial velocities
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleThe complementarity of astrometrie and radial velocity exoplanet observations: : Determining exoplanet mass with astrometric snapshotsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=59649090485&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2008-11-03
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361:200810288
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by-nc/4.0/
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeopenAccess


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