The Hybrid Debris Disk Host Star HD 21997 is a High-Frequency Delta Scuti Pulsator

Aldo G. Sepulveda,Timothy R. Bedding,Simon J. Murphy,Luca Matra,Daniel Huber,Zhoujian Zhang

Research Notes of the AAS（2024）

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摘要

HD 21997 is host to a prototypical "hybrid" debris disk characterized by debris disk-like dust properties and a CO gas mass comparable to a protoplanetary disk. We use Transiting Exoplanet Survey Satellite time series photometry to demonstrate that HD 21997 is a high-frequency delta Scuti pulsator. If the mode identification can be unambiguously determined in future works, an asteroseismic age of HD 21997 may become feasible.

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