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TERRESTRIAL PLANETS ACROSS SPACE AND TIME
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
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Number of Authors: 6
2016 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 833, no 2, 214Article in journal (Refereed) Published
Abstract [en]

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 approximate to 10%, and that only approximate to 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 approximate to 1 x 10(19) and approximate to 5 x 10(20) 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.

Place, publisher, year, edition, pages
2016. Vol. 833, no 2, 214
Keyword [en]
cosmology: miscellaneous, extraterrestrial intelligence, galaxies: formation, planets and satellites, terrestrial planets
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-139390DOI: 10.3847/1538-4357/833/2/214ISI: 000391169600089OAI: oai:DiVA.org:su-139390DiVA: diva2:1072161
Available from: 2017-02-07 Created: 2017-02-06 Last updated: 2017-02-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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