J/A+A/671/A171ivo://CDS.VizieR/J/A+A/671/A171doi:10.26093/cds/vizier.36710171CDSWehrhahn A.Piskunov N.Ryabchikova T.2024-11-28T20:02:37Z2023-03-23T08:29:54ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frf-starsspectroscopyeffective-temperaturemetallicityvisible-astronomyThe characterization of exoplanets requires reliable determination of the fundamental parameters of their host stars. Spectral fitting plays an important role in this process. For the majority of stellar parameters, matching synthetic spectra to the observations provides a robust and unique solution for fundamental parameters, such as effective temperature, surface gravity, abundances, radial and rotational velocities and others. Here we present a new software package for fitting high resolution stellar spectra that is easy to use, available for common platforms and free from commercial licenses. We call it PySME. It is based on the proven Spectroscopy Made Easy (later referred to as IDL SME or "original SME") package. The IDL part of the original SME code has been rewritten in Python, but we kept the efficient C++ and FORTRAN code responsible for molecular-ionization equilibrium, opacities and spectral synthesis. In the process we have updated some components of the optimization procedure offering more flexibility and better analysis of the convergence. The result is a more modern package with the same functionality of the original SME. We apply PySME to a few stars of different spectral types and compared the derived fundamental parameters with the results from and other techniques. We show that PySME works at least as well as the original SME.2023A&A...671A.171Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/671/A171CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/671/A171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/671/A171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/671/A171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/671/A171https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/671/A171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/671/A171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/671/A171/pysme (Stellar parameters of the discussed in the paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/671/A171/pysme?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/671/A171/pysme?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/671/A171/pysme?GETtext/xml+votable180.050000true53.23268537982793-9.4582609705180560.0055555555555555566/5009 12592 12983 25939 26997 35210 36697 48105https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/671/A171?format=asciiOpticaldefaultJ/A+A/671/A171/pysmeStellar parameters of the discussed in the paperSimbadSimbad column added by the CDSmeta.ref.urlcharloggSurface gravity (logg)log(cm.s**-2)phys.gravitydoublee1_loggfit uncertainty of the surface gravity (fit_uncertainty_logg)log(cm.s**-2)stat.errordoublee2_loggSME uncertainty of the surface gravity (sme_uncertainty_logg)log(cm.s**-2)stat.errordouble[M/H]Metallicity [M/H] in H=12 format (monh)phys.abund.Zdoublee1_[M/H]fit uncertainty of the metallicity (fit_uncertainty_monh)stat.error;phys.abund.Z;meta.modelleddoublee2_[M/H]SME uncertainty of the metallicity (sme_uncertainty_monh)stat.error;phys.abund.Z;meta.modelleddoublevmicMicro turbulence parameter (vmic)km/sphys.veloc.microTurbdoublee1_vmicfit uncertainty of the micro turbulence parameter (fit_uncertainty_vmic)km/sstat.error;phys.veloc.microTurb;meta.modelleddoublee2_vmicSME uncertainty of the micro turbulence parameter (sme_uncertainty_vmic)km/sstat.error;phys.veloc.microTurb;meta.modelleddoublevmacmacro turbulence parameter (vmac)km/sphys.veloc.microTurbdoublee1_vmacfit uncertainty of the macro turbulence parameter (fit_uncertainty_vmac)km/sstat.error;phys.veloc.microTurb;meta.modelleddoublee2_vmacSME uncertainty of the macro turbulence parameter (sme_uncertainty_vmac)km/sstat.error;phys.veloc.microTurb;meta.modelleddoublee2_vsiniSME uncertainty of the projected rotational velocity (sme_uncertainty_vsini)km/sstat.error;phys.veloc.rotat;meta.modelleddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the target star (name)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTeffEffective temperature (teff)Kphys.temperature.effectivedoublee1_Tefffit uncertainty of the effective temperature (fit_uncertainty_teff)Kstat.errordoublee2_TeffSME uncertainty of the effective temperature (sme_uncertainty_teff)Kstat.errordoublevsiniProjected rotational velocity (vsini)km/sphys.veloc.rotatdoublee1_vsinifit uncertainty of the projected rotational velocity (fit_uncertainty_vsini)km/sstat.error;phys.veloc.rotat;meta.modelleddouble