The Astrophysical Journal (Jan 2024)
The Gasing Pangkah Collaboration. I. Asteroseismic Identification and Characterization of a Rapidly Rotating Engulfment Candidate
- J. M. Joel Ong,
- Marc Teng Yen Hon,
- Melinda Soares-Furtado,
- Alexander P. Stephan,
- Jennifer van Saders,
- Jamie Tayar,
- Benjamin Shappee,
- Daniel R. Hey,
- Lyra Cao,
- Mutlu Yıldız,
- Zeynep Çelik Orhan,
- Sibel Örtel,
- Benjamin Montet,
- Thomas W.-S. Holoien,
- Joss Bland-Hawthorn,
- Sven Buder,
- Gayandhi M. De Silva,
- Ken C. Freeman,
- Sarah L. Martell,
- Geraint F. Lewis,
- Sanjib Sharma,
- Dennis Stello
Affiliations
- J. M. Joel Ong
- ORCiD
- Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; [email protected]
- Marc Teng Yen Hon
- ORCiD
- Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; [email protected]
- Melinda Soares-Furtado
- ORCiD
- Department of Astronomy, University of Wisconsin–Madison , 475 North Charter Street, Madison, WI 53703, USA; MIT Kavli Institute for Astrophysics and Space Research , 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Alexander P. Stephan
- ORCiD
- Department of Astronomy, The Ohio State University , Columbus, OH 43210, USA; Center for Cosmology and Astroparticle Physics, The Ohio State University , Columbus, OH 43210, USA
- Jennifer van Saders
- ORCiD
- Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; [email protected]
- Jamie Tayar
- ORCiD
- Department of Astronomy, University of Florida , Bryant Space Science Center, Stadium Road, Gainesville, FL 32611, USA
- Benjamin Shappee
- ORCiD
- Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; [email protected]
- Daniel R. Hey
- ORCiD
- Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822, USA ; [email protected]
- Lyra Cao
- ORCiD
- Department of Astronomy, The Ohio State University , Columbus, OH 43210, USA
- Mutlu Yıldız
- ORCiD
- Department of Astronomy and Space Sciences, Science Faculty, Ege University , 35100, Bornova, İzmir, Turkey
- Zeynep Çelik Orhan
- ORCiD
- Department of Astronomy and Space Sciences, Science Faculty, Ege University , 35100, Bornova, İzmir, Turkey
- Sibel Örtel
- ORCiD
- Department of Astronomy and Space Sciences, Science Faculty, Ege University , 35100, Bornova, İzmir, Turkey
- Benjamin Montet
- ORCiD
- School of Physics, University of New South Wales , Sydney, NSW 2052, Australia; UNSW Data Science Hub, University of New South Wales , Sydney, NSW 2052, Australia
- Thomas W.-S. Holoien
- ORCiD
- Carnegie Observatories , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- Joss Bland-Hawthorn
- ORCiD
- Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney , NSW 2006, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Sven Buder
- ORCiD
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia; Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT 2611, Australia
- Gayandhi M. De Silva
- ORCiD
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia; School of Mathematical and Physical Sciences, Macquarie University , Sydney, NSW 2109, Australia; Australian Astronomical Optics, Macquarie University , 105 Delhi Road, North Ryde, NSW 2113, Australia
- Ken C. Freeman
- ORCiD
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia; Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT 2611, Australia
- Sarah L. Martell
- ORCiD
- School of Physics, University of New South Wales , Sydney, NSW 2052, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Geraint F. Lewis
- ORCiD
- Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney , NSW 2006, Australia
- Sanjib Sharma
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
- Dennis Stello
- ORCiD
- School of Physics, University of New South Wales , Sydney, NSW 2052, Australia; Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney , NSW 2006, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia; Stellar Astrophysics Centre, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark
- DOI
- https://doi.org/10.3847/1538-4357/ad2ea2
- Journal volume & issue
-
Vol. 966,
no. 1
p. 42
Abstract
We report the discovery and characterization of TIC 350842552 (“Zvrk”), an apparently isolated, rapidly rotating ( P _rot ∼ 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.
Keywords
