TERRESTRIAL PLANETS ACROSS SPACE and TIME
(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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- author
- Zackrisson, Erik ; Calissendorff, Per ; González, Juan ; Benson, Andrew ; Johansen, Anders LU and Janson, Markus
- organization
- publishing date
- 2016-12-20
- 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
- article number
- 214
- publisher
- American Astronomical Society
- external identifiers
-
- wos:000391169600089
- scopus:85007564335
- 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
- 2024-02-19 14:56:23
@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>}},
author = {{Zackrisson, Erik and Calissendorff, Per and González, Juan and Benson, Andrew and Johansen, Anders and Janson, Markus}},
issn = {{0004-637X}},
keywords = {{cosmology: miscellaneous; extraterrestrial intelligence; galaxies: formation; planets and satellites: terrestrial planets}},
language = {{eng}},
month = {{12}},
number = {{2}},
publisher = {{American Astronomical Society}},
series = {{Astrophysical Journal}},
title = {{TERRESTRIAL PLANETS ACROSS SPACE and TIME}},
url = {{http://dx.doi.org/10.3847/1538-4357/833/2/214}},
doi = {{10.3847/1538-4357/833/2/214}},
volume = {{833}},
year = {{2016}},
}