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TERRESTRIAL PLANETS ACROSS SPACE and TIME

Zackrisson, Erik; Calissendorff, Per; González, Juan; Benson, Andrew; Johansen, Anders LU and Janson, Markus (2016) In Astrophysical Journal 833(2).
Abstract

The study of cosmology, galaxy formation, and exoplanets has now advanced to a stage where a cosmic inventory of terrestrial planets (TPs) may be attempted. By coupling semianalytic models of galaxy formation to a recipe that relates the occurrence of planets to the mass and metallicity of their host stars, we trace the population of TPs around both solar-mass (FGK type) and lower-mass (M dwarf) stars throughout all of cosmic history. We find that the mean age of TPs in the local universe is 7 ± 1 Gyr for FGK hosts and 8 ± 1 Gyr for M dwarfs. We estimate that hot Jupiters have depleted the population of TPs around FGK stars by no more than ≈10%, and that only ≈10% of the TPs at the current epoch are orbiting stars... (More)

The study of cosmology, galaxy formation, and exoplanets has now advanced to a stage where a cosmic inventory of terrestrial planets (TPs) may be attempted. By coupling semianalytic models of galaxy formation to a recipe that relates the occurrence of planets to the mass and metallicity of their host stars, we trace the population of TPs around both solar-mass (FGK type) and lower-mass (M dwarf) stars throughout all of cosmic history. We find that the mean age of TPs in the local universe is 7 ± 1 Gyr for FGK hosts and 8 ± 1 Gyr for M dwarfs. We estimate that hot Jupiters have depleted the population of TPs around FGK stars by no more than ≈10%, and that only ≈10% of the TPs at the current epoch are orbiting stars in a metallicity range for which such planets have yet to be confirmed. The typical TP in the local universe is located in a spheroid-dominated galaxy with a total stellar mass comparable to that of the Milky Way. When looking at the inventory of planets throughout the whole observable universe, we argue for a total of ≈1 × 1019 and ≈5 × 1020 TPs around FGK and M stars, respectively. Due to light travel time effects, the TPs on our past light cone exhibit a mean age of just 1.7±0.2 Gyr. These results are discussed in the context of cosmic habitability, the Copernican principle, and searches for extraterrestrial intelligence at cosmological distances.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
cosmology: miscellaneous, extraterrestrial intelligence, galaxies: formation, planets and satellites: terrestrial planets
in
Astrophysical Journal
volume
833
issue
2
publisher
University of Chicago Press
external identifiers
  • scopus:85007564335
  • wos:000391169600089
ISSN
0004-637X
DOI
10.3847/1538-4357/833/2/214
language
English
LU publication?
yes
id
c4e27de6-4018-46a1-8101-df4663926af2
date added to LUP
2017-01-13 08:16:38
date last changed
2017-09-24 05:05:49
@article{c4e27de6-4018-46a1-8101-df4663926af2,
  abstract     = {<p>The study of cosmology, galaxy formation, and exoplanets has now advanced to a stage where a cosmic inventory of terrestrial planets (TPs) may be attempted. By coupling semianalytic models of galaxy formation to a recipe that relates the occurrence of planets to the mass and metallicity of their host stars, we trace the population of TP<sub>s</sub> around both solar-mass (FGK type) and lower-mass (M dwarf) stars throughout all of cosmic history. We find that the mean age of TP<sub>s</sub> in the local universe is 7 ± 1 Gyr for FGK hosts and 8 ± 1 Gyr for M dwarfs. We estimate that hot Jupiters have depleted the population of TPs around FGK stars by no more than ≈10%, and that only ≈10% of the TPs at the current epoch are orbiting stars in a metallicity range for which such planets have yet to be confirmed. The typical TP in the local universe is located in a spheroid-dominated galaxy with a total stellar mass comparable to that of the Milky Way. When looking at the inventory of planets throughout the whole observable universe, we argue for a total of ≈1 × 10<sup>19</sup> and ≈5 × 10<sup>20</sup> TPs around FGK and M stars, respectively. Due to light travel time effects, the TP<sub>s</sub> on our past light cone exhibit a mean age of just 1.7±0.2 Gyr. These results are discussed in the context of cosmic habitability, the Copernican principle, and searches for extraterrestrial intelligence at cosmological distances.</p>},
  articleno    = {214},
  author       = {Zackrisson, Erik and Calissendorff, Per and González, Juan and Benson, Andrew and Johansen, Anders and Janson, Markus},
  issn         = {0004-637X},
  keyword      = {cosmology: miscellaneous,extraterrestrial intelligence,galaxies: formation,planets and satellites: terrestrial planets},
  language     = {eng},
  month        = {12},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {TERRESTRIAL PLANETS ACROSS SPACE and TIME},
  url          = {http://dx.doi.org/10.3847/1538-4357/833/2/214},
  volume       = {833},
  year         = {2016},
}