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Spinning up the surface: evidence for planetary engulfment or unexpected angular momentum transport?

In this paper, we report the potential detection of a nonmonotonic radial rotation profile in a low-mass lower-luminosity giant star. For most low- and intermediate-mass stars, the rotation on the main sequence seems to be close to rigid. As these stars evolve into giants, the core contracts and the...

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Main Authors: Tayar, Jamie (Author) , Moyano, Facundo D. (Author) , Soares-Furtado, Melinda (Author) , Escorza, Ana (Author) , Joyce, Meridith (Author) , Martell, Sarah L. (Author) , García, Rafael A. (Author) , Breton, Sylvain N. (Author) , Mathis, Stéphane (Author) , Mathur, Savita (Author) , Delsanti, Vincent (Author) , Kiefer, Sven (Author) , Reffert, Sabine (Author) , Bowman, Dominic M. (Author) , Reeth, Timothy Van (Author) , Shetye, Shreeya (Author) , Gehan, Charlotte (Author) , Grunblatt, Samuel K. (Author)
Format: Article (Journal)
Language:English
Published: 2022 November 16
In: The astrophysical journal
Year: 2022, Volume: 940, Issue: 1, Pages: 1-13
ISSN:1538-4357
DOI:10.3847/1538-4357/ac9312
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/ac9312
Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.3847/1538-4357/ac9312
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Author Notes:Jamie Tayar, Facundo D. Moyano, Melinda Soares-Furtado, Ana Escorza, Meridith Joyce, Sarah L. Martell, Rafael A. García, Sylvain N. Breton, Stéphane Mathis, Savita Mathur, Vincent Delsanti, Sven Kiefer, Sabine Reffert, Dominic M. Bowman, Timothy Van Reeth, Shreeya Shetye, Charlotte Gehan, and Samuel K. Grunblatt
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Summary:In this paper, we report the potential detection of a nonmonotonic radial rotation profile in a low-mass lower-luminosity giant star. For most low- and intermediate-mass stars, the rotation on the main sequence seems to be close to rigid. As these stars evolve into giants, the core contracts and the envelope expands, which should suggest a radial rotation profile with a fast core and a slower envelope and surface. KIC 9267654, however, seems to show a surface rotation rate that is faster than its bulk envelope rotation rate, in conflict with this simple angular momentum conservation argument. We improve the spectroscopic surface constraint, show that the pulsation frequencies are consistent with the previously published core and envelope rotation rates, and demonstrate that the star does not show strong chemical peculiarities. We discuss the evidence against any tidally interacting stellar companion. Finally, we discuss the possible origin of this unusual rotation profile, including the potential ingestion of a giant planet or unusual angular momentum transport by tidal inertial waves triggered by a close substellar companion, and encourage further observational and theoretical efforts.
Item Description:Gesehen am 31.01.2023
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/ac9312

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