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Title: The Fate of Close-in Planets: Tidal or Magnetic Migration?

Abstract

Planets in close-in orbits interact magnetically and tidally with their host stars. These interactions lead to a net torque that makes close-in planets migrate inward or outward depending on their orbital distance. We systematically compare the strength of magnetic and tidal torques for typical observed star–planet systems (T-Tauri and hot Jupiter, M-dwarf and Earth-like planet, K star and hot Jupiter) based on state-of-the-art scaling laws. We find that depending on the characteristics of the system, tidal or magnetic effects can dominate. For very close-in planets, we find that both torques can make a planet migrate on a timescale as small as 10–100 thousands of years. Both effects thus have to be taken into account when predicting the evolution of compact systems.

Authors:
; ; ; ;  [1]; ;  [2]
  1. Laboratoire AIM Paris-Saclay, CEA/Irfu Université Paris-Diderot CNRS/INSU, F-91191 Gif-sur-Yvette (France)
  2. Department of Astronomy, University of Geneva, Chemin des Maillettes 51, 1290 Versoix (Switzerland)
Publication Date:
OSTI Identifier:
22654380
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 847; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; EVOLUTION; INTERACTIONS; JUPITER PLANET; MAGNETIC FIELDS; MIGRATION; ORBITS; SATELLITES; SCALING LAWS; STABILITY; STARS; TORQUE

Citation Formats

Strugarek, A., Bolmont, E., Mathis, S., Brun, A. S., Réville, V., Gallet, F., and Charbonnel, C., E-mail: antoine.strugarek@cea.fr. The Fate of Close-in Planets: Tidal or Magnetic Migration?. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA8D70.
Strugarek, A., Bolmont, E., Mathis, S., Brun, A. S., Réville, V., Gallet, F., & Charbonnel, C., E-mail: antoine.strugarek@cea.fr. The Fate of Close-in Planets: Tidal or Magnetic Migration?. United States. doi:10.3847/2041-8213/AA8D70.
Strugarek, A., Bolmont, E., Mathis, S., Brun, A. S., Réville, V., Gallet, F., and Charbonnel, C., E-mail: antoine.strugarek@cea.fr. Sun . "The Fate of Close-in Planets: Tidal or Magnetic Migration?". United States. doi:10.3847/2041-8213/AA8D70.
@article{osti_22654380,
title = {The Fate of Close-in Planets: Tidal or Magnetic Migration?},
author = {Strugarek, A. and Bolmont, E. and Mathis, S. and Brun, A. S. and Réville, V. and Gallet, F. and Charbonnel, C., E-mail: antoine.strugarek@cea.fr},
abstractNote = {Planets in close-in orbits interact magnetically and tidally with their host stars. These interactions lead to a net torque that makes close-in planets migrate inward or outward depending on their orbital distance. We systematically compare the strength of magnetic and tidal torques for typical observed star–planet systems (T-Tauri and hot Jupiter, M-dwarf and Earth-like planet, K star and hot Jupiter) based on state-of-the-art scaling laws. We find that depending on the characteristics of the system, tidal or magnetic effects can dominate. For very close-in planets, we find that both torques can make a planet migrate on a timescale as small as 10–100 thousands of years. Both effects thus have to be taken into account when predicting the evolution of compact systems.},
doi = {10.3847/2041-8213/AA8D70},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 847,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}