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Title: STELLAR ROTATION AND PLANET INGESTION IN GIANTS

Abstract

We investigate the expected increase in the rotation rate of post-main-sequence stars as they expand and ingest orbiting planets. This phenomenon is expected to occur when the stellar radius becomes larger than the planet's periastron distance. We calculate the expected frequency of planet ingestion during the red giant, horizontal branch (HB), and early asymptotic giant branch phases for planets of mass m{sub p}{>=}1M{sub J}. We also calculate the probability of observing anomalous rotation rates in a population of solar metallicity giants as a function of stellar mass and evolutionary stage. Planet ingestion is most easily detectable in a solar mass HB star, with a probability of about 1% for solar-neighborhood metallicity. Our analysis is based on the observed distribution of mass, eccentricity, semimajor axis for extrasolar planets around solar-type main-sequence stars, on stellar evolution models, and on the typical observed rotation rates observed in a sample of solar-neighborhood giants.

Authors:
 [1]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
Publication Date:
OSTI Identifier:
21583038
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 135; Journal Issue: 6; Other Information: DOI: 10.1088/0004-6256/135/6/2287; Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DISTANCE; GIANT STARS; MAIN SEQUENCE STARS; MASS; PLANETS; PROBABILITY; ROTATION; STAR EVOLUTION; EVOLUTION; MOTION; STARS

Citation Formats

Massarotti, Alessandro. STELLAR ROTATION AND PLANET INGESTION IN GIANTS. United States: N. p., 2008. Web. doi:10.1088/0004-6256/135/6/2287.
Massarotti, Alessandro. STELLAR ROTATION AND PLANET INGESTION IN GIANTS. United States. https://doi.org/10.1088/0004-6256/135/6/2287
Massarotti, Alessandro. 2008. "STELLAR ROTATION AND PLANET INGESTION IN GIANTS". United States. https://doi.org/10.1088/0004-6256/135/6/2287.
@article{osti_21583038,
title = {STELLAR ROTATION AND PLANET INGESTION IN GIANTS},
author = {Massarotti, Alessandro},
abstractNote = {We investigate the expected increase in the rotation rate of post-main-sequence stars as they expand and ingest orbiting planets. This phenomenon is expected to occur when the stellar radius becomes larger than the planet's periastron distance. We calculate the expected frequency of planet ingestion during the red giant, horizontal branch (HB), and early asymptotic giant branch phases for planets of mass m{sub p}{>=}1M{sub J}. We also calculate the probability of observing anomalous rotation rates in a population of solar metallicity giants as a function of stellar mass and evolutionary stage. Planet ingestion is most easily detectable in a solar mass HB star, with a probability of about 1% for solar-neighborhood metallicity. Our analysis is based on the observed distribution of mass, eccentricity, semimajor axis for extrasolar planets around solar-type main-sequence stars, on stellar evolution models, and on the typical observed rotation rates observed in a sample of solar-neighborhood giants.},
doi = {10.1088/0004-6256/135/6/2287},
url = {https://www.osti.gov/biblio/21583038}, journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 6,
volume = 135,
place = {United States},
year = {Sun Jun 15 00:00:00 EDT 2008},
month = {Sun Jun 15 00:00:00 EDT 2008}
}