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  4. Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport?
 
research article

Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport?

Tayar, Jamie
•
Moyano, Facundo D.
•
Soares-Furtado, Melinda
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November 1, 2022
The Astrophysical Journal

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.

  • Details
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Type
research article
DOI
10.3847/1538-4357/ac9312
Web of Science ID

WOS:000885924900001

Author(s)
Tayar, Jamie
Moyano, Facundo D.
Soares-Furtado, Melinda
Escorza, Ana
Joyce, Meridith
Martell, Sarah L.
Garcia, Rafael A.
Breton, Sylvain N.
Mathis, Stephane
Mathur, Savita
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Date Issued

2022-11-01

Publisher

IOP Publishing Ltd

Published in
The Astrophysical Journal
Volume

940

Issue

1

Start page

23

Subjects

Astronomy & Astrophysics

•

Astronomy & Astrophysics

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internal gravity-waves

•

kepler light curves

•

solar-type stars

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low-mass stars

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main-sequence

•

red giants

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differential rotation

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magnetic-fields

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turbulent convection

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tidal dissipation

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
December 5, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/193052
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