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dc.contributor.authorJenkins, J. S.
dc.contributor.authorpavlenko, Yakiv
dc.contributor.authorIvanyuk, Oleksiy
dc.contributor.authorGallardo, Jose
dc.contributor.authorjones, Matias
dc.contributor.authorday-jones, Avril
dc.contributor.authorJones, H.R.A.
dc.contributor.authorRuiz, Maria-Teresa
dc.contributor.authorPinfield, D.J.
dc.contributor.authorYakovina, Larissa
dc.date.accessioned2012-04-03T12:00:35Z
dc.date.available2012-04-03T12:00:35Z
dc.date.issued2012-03
dc.identifier.citationJenkins , J S , pavlenko , Y , Ivanyuk , O , Gallardo , J , jones , M , day-jones , A , Jones , H R A , Ruiz , M-T , Pinfield , D J & Yakovina , L 2012 , ' Benchmark cool companions : Ages and abundances for the PZ Tel system ' Monthly Notices of the Royal Astronomical Society , vol. 420 , no. 4 , pp. 3587–3598 . https://doi.org/10.1111/j.1365-2966.2011.20280.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 697589
dc.identifier.otherPURE UUID: 5f46e56b-13e1-463b-bee8-1043a654e850
dc.identifier.otherArXiv: http://arxiv.org/abs/1111.7001v2
dc.identifier.otherScopus: 84857657172
dc.identifier.urihttp://hdl.handle.net/2299/8168
dc.description16 pages, 10 figures and 3 tables. Accepted for publication in MNRAS
dc.description.abstractWe present new ages and abundance measurements for the pre-main sequence star PZ Tel. PZ Tel was recently found to host a young and low-mass companion. Using FEROS spectra we have measured atomic abundances (e.g. Fe and Li) and chromospheric activity for PZ Tel and used these to obtain metallicity and age estimates for the companion. We find PZ Tel to be a rapidly rotating (vsini=73\pm5km/s), ~solar metallicity star (logN(Fe)=-4.37 dex or [Fe/H]=0.05 dex) with a measured mean logR'HK of -4.12. We measure a NLTE lithium abundance of logN(Li)=3.1\pm0.1dex, which from depletion models gives rise to an age of 7+4-2 Myrs for the system. The measured chromospheric activity returns an age of 26\pm2Myrs, as does fitting pre-main sequence evolutionary tracks (Tau_evol=22\pm3Myrs), both of which are in disagreement with the lithium age. We speculate on reasons for this difference and introduce new models for lithium depletion that incorporates both rotation and magnetic field affects. We also synthesize solar, metal-poor and metal-rich substellar evolutionary models to better determine the bulk properties of PZ Tel B, showing that PZ Tel B is probably more massive than previous estimates, meaning the companion is not a giant exoplanet. We show how PZ Tel B compares to other currently known age and metallicity benchmark systems and try to empirically test the effects of dust opacity as a function of metallicity on the near infrared colours of brown dwarfs. Current models suggest that in the near infrared observations are more sensitive to low-mass companions orbiting more metal-rich stars. We also look for trends between infrared photometry and metallicity amongst a growing population of substellar benchmark objects, and identify the need for more data in mass-age-metallicity parameter space. [Abridged]en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rights/dk/atira/pure/core/openaccesspermission/embargoed
dc.subjectastro-ph.SR
dc.subjectastro-ph.EP
dc.titleBenchmark cool companions : Ages and abundances for the PZ Tel systemen
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.date.embargoedUntil2012-09-01
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2011.20280.x
rioxxterms.licenseref.startdate2012-09-01+01:00
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.date.embargo2012-09-01+01:00
herts.rights.accesstypeopenAccess


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