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We present measurements of interspecies Feshbach resonances and subsequentcreation of dual-species Bose-Einstein condensates of $^{23}\mathrm{Na}$ and$^{39}\mathrm{K}$. We prepare both optically trapped ensembles in the spinstate $\left|f = 1,m_{f}=-1\right\rangle$ and perform atom loss spectroscopy ina magnetic field range from 0 to $700 \, \mathrm{G}$. The observed featuresinclude several s-wave poles and a zero crossing of the interspecies scatteringlength as well as inelastic two-body contributions in the $\mathcal{M} =m_{\mathrm{Na}}+m_{\mathrm{K}} = -2$ submanifold. We identify and discuss thesuitability of different magnetic field regions for the purposes of sympatheticcooling of \K and achieving dual-species degeneracy. Two condensates arecreated simultaneously by evaporation at a magnetic field of about $150 \,\mathrm{G}$, which provides sizable intra- and interspecies scattering ratesneeded for fast thermalization. The impact of the differential gravitationalsag on the miscibility criterion for the mixture is discussed. Our resultsserve as a promising starting point for the magnetoassociation into quantumdegenerate $^{23}\mathrm{Na}^{39}\mathrm{K}$ Feshbach molecules.

Feshbach spectroscopy and dual-species Bose-Einstein condensation of $^{23}\mathrm{Na}-$$^{39}\mathrm{K}$ mixtures