Oral Presentation

The Localized and Chemically Rich Features near the Bases of the Protostellar Jet in HOPS 87

Author(s): Shih-Ying Hsu (ASIAA) , Chin-Fei Lee (ASIAA) , and the ALMASOP Collaboration

Presenter: Shih-Ying Hsu (ASIAA)

HOPS 87 is a Class 0 protostellar core known to host an extremely young bipolar outflow. We discovered localized chemically rich regions near the bases of the collimated jet in HOPS 87, containing molecules such as H2CO, 13CS, H2S, OCS, and CH3OH — the simplest complex organic molecule (COM). The morphology and kinematics suggest that these localized features result from jet-driven shocks rather than being part of the hot corino surrounding the protostar. Chemical variations have been observed between these newly discovered COM-rich regions and the hot corino. We speculate that this chemical simplicity may arise either from the release of ices with a less complex chemical history or from the effects of shock chemistry. Our study highlights the dynamic interplay between the protostellar bipolar outflow, disk, inner-core environment, and surrounding medium, offering new insights into molecular complexity in solar-like young stellar objects.