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We present the first maps of cyanoacetylene isotopologues in Titan'satmosphere, including H$^{13}$CCCN and HCCC$^{15}$N, detected in the 0.9 mmband using the Atacama Large Millimeter/submillimeter array (ALMA) around thetime of Titan's (southern winter) solstice in May 2017. The firsthigh-resolution map of HC$_3$N in its $v_7=1$ vibrationally excited state isalso presented, revealing a unique snapshot of the global HC$_3$N distribution,free from the strong optical depth effects that adversely impact theground-state ($v=0$) map. The HC$_3$N emission is found to be strongly enhancedover Titan's south pole (by a factor of 5.7 compared to the north pole),consistent with rapid photochemical loss of HC$_3$N from the summer hemispherecombined with production and transport to the winter pole since the April 2015ALMA observations. The H$^{13}$CCCN/HCCC$^{15}$N flux ratio is derived at thesouthern HC$_3$N peak, and implies an HC$_3$N/HCCC$^{15}$N ratio of $67\pm14$.This represents a significant enrichment in $^{15}$N compared with Titan's mainmolecular nitrogen reservoir, which has a $^{14}$N/$^{15}$N ratio of 167, andconfirms the importance of photochemistry in determining the nitrogen isotopicratio in Titan's organic inventory.

Interferometric imaging of Titan's HC$_3$N, H$^{13}$CCCN and HCCC$^{15}$N