The Gasing Pangkah Collaboration. I. Asteroseismic Identification and Characterization of a Rapidly Rotating Engulfment Candidate
Küçük Resim Yok
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Iop Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We report the discovery and characterization of TIC 350842552 (Zvrk), an apparently isolated, rapidly rotating (P (rot) similar to 99 days) red giant observed by TESS in its southern Continuous Viewing Zone. The star's fast surface rotation is independently verified by the use of p-mode asteroseismology, strong periodicity in TESS and ASAS-SN photometry, and measurements of spectroscopic rotational broadening. A two-component fit to APOGEE spectra indicates a coverage fraction of its surface features consistent with the amplitude of the photometric rotational signal. Variations in the amplitude of its photometric modulations over time suggest the evolution of its surface morphology and therefore enhanced magnetic activity. We further develop and deploy new asteroseismic techniques to characterize radial differential rotation, but find at best only weak evidence for rotational shear within Zvrk's convective envelope. This high surface rotation rate is incompatible with models of angular-momentum transport in single-star evolution. Spectroscopic abundance estimates also indicate a high lithium abundance, among other chemical anomalies. Taken together, all of these suggest a planet-ingestion scenario for the formation of this rotational configuration, various models for which we examine in detail.
Açıklama
Anahtar Kelimeler
Red Giant Branch, Radial Differential Rotation, Angular-Momentum Transport, Convective Boundaries, Planetary Engulfment, Internal-Rotation, Apokasc Catalog, Python Package, Core Rotation, Hot Jupiters
Kaynak
Astrophysical Journal
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
966
Sayı
1
