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Hot Jupiters and Cool Stars

Villaver, Eva; Livio, Mario; Mustill, Alexander LU and Siess, Lionel (2014) In Astrophysical Journal 794(1).
Abstract
Close-in planets are in jeopardy, as their host stars evolve off the main sequence (MS) to the subgiant and red giant phases. In this paper, we explore the influences of the stellar mass (in the range 1.5-2M similar to), mass-loss prescription, planet mass (from Neptune up to 10 Jupiter masses), and eccentricity on the orbital evolution of planets as their parent stars evolve to become subgiants and red giants. We find that planet engulfment along the red giant branch is not very sensitive to the stellar mass or mass-loss rates adopted in the calculations, but quite sensitive to the planetary mass. The range of initial separations for planet engulfment increases with decreasing mass-loss rates or stellar masses and increasing planetary... (More)
Close-in planets are in jeopardy, as their host stars evolve off the main sequence (MS) to the subgiant and red giant phases. In this paper, we explore the influences of the stellar mass (in the range 1.5-2M similar to), mass-loss prescription, planet mass (from Neptune up to 10 Jupiter masses), and eccentricity on the orbital evolution of planets as their parent stars evolve to become subgiants and red giants. We find that planet engulfment along the red giant branch is not very sensitive to the stellar mass or mass-loss rates adopted in the calculations, but quite sensitive to the planetary mass. The range of initial separations for planet engulfment increases with decreasing mass-loss rates or stellar masses and increasing planetary masses. Regarding the planet's orbital eccentricity, we find that as the star evolves into the red giant phase, stellar tides start to dominate over planetary tides. As a consequence, a transient population of moderately eccentric close-in Jovian planets is created that otherwise would have been expected to be absent from MS stars. We find that very eccentric and distant planets do not experience much eccentricity decay, and that planet engulfment is primarily determined by the pericenter distance and the maximum stellar radius. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
planetary systems, stars: evolution, stars: fundamental parameters, stars: general
in
Astrophysical Journal
volume
794
issue
1
publisher
University of Chicago Press
external identifiers
  • wos:000342581200003
  • scopus:84907476194
ISSN
0004-637X
DOI
10.1088/0004-637X/794/1/3
language
English
LU publication?
yes
id
783a518c-cc1b-4b49-a5f8-970d0879f5a1 (old id 4796301)
date added to LUP
2014-11-24 16:36:07
date last changed
2017-11-12 03:41:16
@article{783a518c-cc1b-4b49-a5f8-970d0879f5a1,
  abstract     = {Close-in planets are in jeopardy, as their host stars evolve off the main sequence (MS) to the subgiant and red giant phases. In this paper, we explore the influences of the stellar mass (in the range 1.5-2M similar to), mass-loss prescription, planet mass (from Neptune up to 10 Jupiter masses), and eccentricity on the orbital evolution of planets as their parent stars evolve to become subgiants and red giants. We find that planet engulfment along the red giant branch is not very sensitive to the stellar mass or mass-loss rates adopted in the calculations, but quite sensitive to the planetary mass. The range of initial separations for planet engulfment increases with decreasing mass-loss rates or stellar masses and increasing planetary masses. Regarding the planet's orbital eccentricity, we find that as the star evolves into the red giant phase, stellar tides start to dominate over planetary tides. As a consequence, a transient population of moderately eccentric close-in Jovian planets is created that otherwise would have been expected to be absent from MS stars. We find that very eccentric and distant planets do not experience much eccentricity decay, and that planet engulfment is primarily determined by the pericenter distance and the maximum stellar radius.},
  articleno    = {3},
  author       = {Villaver, Eva and Livio, Mario and Mustill, Alexander and Siess, Lionel},
  issn         = {0004-637X},
  keyword      = {planetary systems,stars: evolution,stars: fundamental parameters,stars: general},
  language     = {eng},
  number       = {1},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {Hot Jupiters and Cool Stars},
  url          = {http://dx.doi.org/10.1088/0004-637X/794/1/3},
  volume       = {794},
  year         = {2014},
}