New detections of HC$_{5}$N toward hot cores associated with 6.7 GHz methanol masers

TL;DR

This study reports the detection of HC$_{5}$N in hot molecular cores, challenging previous assumptions and supporting models that predict its transient presence during core evolution.

Contribution

First detection of HC$_{5}$N in hot cores, providing evidence for its temporary existence during core evolution, contrary to prior expectations.

Findings

HC$_{5}$N detected in 35 out of 79 hot cores

Detection challenges previous assumptions about cyanopolyynes in hot cores

Supports models predicting transient HC$_{5}$N presence

Abstract

We present new detections of cyanodiacetylene (HC$_{5}$N) toward hot molecular cores, observed with the Tidbinbilla 34 m radio telescope (DSS-34). In a sample of 79 hot molecular cores, HC$_{5}$N was detected towards 35. These results are counter to the expectation that long chain cyanopolyynes, such as HC$_{5}$N, are not typically found in hot molecular cores, unlike their shorter chain counterpart HC$_{3}$N. However it is consistent with recent models which suggest HC$_{5}$N may exist for a limited period during the evolution of hot molecular cores.