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We report the Atacama Large Millimeter/submillimeter Array (ALMA)observations of the metal rich host galaxy of superluminous supernova (SLSN)PTF10tpz, a barred spiral galaxy at z=0.03994. We find the CO(1-0) emission tobe confined within the bar of the galaxy. The distribution and kinematics ofmolecular gas in the host galaxy resemble gas flows along two lanes runningfrom the tips of the bar towards the galaxy center. These gas lanes end in agaseous structure in the inner region of the galaxy, likely associated with aninner Lindblad resonance. The interaction between the large-scale gas flows inthe bar and the gas in the inner region plausibly leads to the formation ofmassive molecular clouds and consequently massive clusters. This in turn canresult in formation of massive stars, and thus the likely progenitor of theSLSN in a young, massive cluster. This picture is consistent with SLSN PTF10tpzbeing located near the inner structure. We find the molecular gas in thevicinity of the SLSN to have high surface densities, comparable with those ininteracting galaxies or starburst regions in nearby galaxies. This lendssupport to high densities being favorable conditions for formation of SLSNeprogenitors.

A superluminous supernova in high surface density molecular gas within the bar of a metal-rich galaxy