Feasibility of Detecting Interstellar Panspermia in Astrophysical Environments

@article{Grimaldi2021FeasibilityOD,
  title={Feasibility of Detecting Interstellar Panspermia in Astrophysical Environments},
  author={Claudio Grimaldi and Manasvi Lingam and Amedeo Balbi},
  journal={The Astronomical Journal},
  year={2021},
  volume={162}
}
The proposition that life can spread from one planetary system to another (interstellar panspermia) has a long history, but this hypothesis is difficult to test through observations. We develop a mathematical model that takes parameters such as the microbial survival lifetime, the stellar velocity dispersion, and the dispersion of ejecta into account in order to assess the prospects for detecting interstellar panspermia. We show that the correlations between pairs of life-bearing planetary… 
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References

SHOWING 1-10 OF 48 REFERENCES
Random Heterogeneous Materials: Microstructure and Macroscopic Properties
Motivation and overview * PART I Microstructural characterization * Microstructural descriptors * Statistical mechanics of particle systems * Unified approach * Monodisperse spheres * Polydisperse
Macroscopic Properties (New
  • Natur, 407,
  • 2009
Planet Formation and Panspermia: New Prospects
  • AsBio,
  • 2005
Introduction to Percolation Theory (London: Taylor and Francis
  • 1994
Quantifying the information impact of future searches for exoplanetary biosignatures
TLDR
It is shown that even a single detection of biosignatures in the vicinity of the authors' stellar system, in a survey of similar size to what will be obtainable in the next 2 decades, would affect significantly their prior belief on the frequency of life in the universe.
The Habitability of the Galactic Bulge
TLDR
Analytical models of the star density in the bulge are used to provide estimates of the rate of catastrophic events and of the diffusion timescales for life over interstellar distances.
Aerobic microbial life persists in oxic marine sediment as old as 101.5 million years
TLDR
It is shown that aerobic microbial life can be revived and retain metabolic potential even from 101.5 Ma-old sediment, showing that microbial communities widely distributed in organic-poor abyssal sediment consist mainly of aerobes that retain their metabolic potential under extremely low-energy conditions.
The Radio Search for Intelligent Extraterrestrial Life
Possible Transfer of Life by Earth-Grazing Objects to Exoplanetary Systems
TLDR
It is found that 107–109 objects discovered to graze the Earth’s atmosphere and shift into a Jupiter-crossing orbit could have been captured by binary star systems over the lifetime of the Solar System.
Initial characterization of interstellar comet 2I/Borisov
Interstellar comets penetrating through the Solar System had been anticipated for decades 1 , 2 . The discovery of asteroidal-looking ‘Oumuamua 3 , 4 was thus a huge surprise and a puzzle.
...
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