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New numerical determination of habitability in the Galaxy: the SETI connection

  • Rodrigo Ramirez (a1), Marco A. Gómez-Muñoz (a1) (a2), Roberto Vázquez (a1) and Patricia G. Núñez (a2)

In this paper, we determine the habitability of Sun-like stars in the Galaxy using Monte Carlo simulations, which are guided by the factors of the Drake Equation for the considerations on the astrophysical and biological parameters needed to generate and maintain life on a planet's surface. We used a simple star distribution, initial mass function and star formation history to reproduce the properties and distribution of stars within the Galaxy. Using updated exoplanet data from the Kepler mission, we assign planets to some of the stars, and then follow the evolution of life on the planets that met the habitability criteria using two different civilization hypotheses. We predict that around 51% of Earth-like planets in the habitable zone (HZ) are inhabited by primitive life and 4% by technological life. We apply the results to the Kepler field of view, and predicted that there should be at least six Earth-like planets in the HZ, three of them inhabited by primitive life. According to our model, non-technological life is very common if there are the right conditions, but communicative civilizations are less likely to exist and detect. Nonetheless, we predict a considerable number of detectable civilizations within our Galaxy, making it worthwhile to keep searching.

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M. Bogonovich (2011). Intelligence's likelihood and evolutionary time frame. Int. J. Astrobiol. 10, 113122.

W.J. Borucki , (2013). Kepler-62: a five-planet system with planets of 1.4 and 1.6 earth radii in the habitable zone. Science 340, 587590.

L. Carigi (2015). Solar neighborhood. In Encyclopedia of Astrobiology, ed. M. Gargaud , W.M. Irvine , R. Amils , H.J. Cleaves , D. Pinti , J. Cernicharo Quintanilla , D. Rouan , T. Spohn , S. Tirard & M. Viso , pp. 22862287. Springer, Berlin, Heidelberg.

B. Carter (2008). Five- or six-step scenario for evolution? Int. J. Astrobiol. 7, 177182.

G. Chabrier (2003). Galactic stellar and substellar initial mass function. PASP 115, 763795.

N.J. Emery & N.S. Clayton (2004). The mentality of crows: convergent evolution of intelligence in corvids and apes. Science 306, 19031907.

D.H. Forgan (2009). A numerical testbed for hypotheses of extraterrestrial life and intelligence. Int. J. Astrobiol. 8, 121131.

D.H. Forgan & K. Rice (2010). Numerical testing of the Rare Earth Hypothesis using Monte Carlo realization techniques. Int. J. Astrobiol. 9, 7380.

J.M. Jenkins (2015). Discovery and validation of Keple-452b: a $1.6 R_ \oplus $ super Earth exoplanet in the habitable zone of a G2 star. Astron. J. 150, 56.

J.F. Kasting , D.P. Whitmire & R.T. Reynolds (1993). Habitable zones around main sequence stars. Icarus 101, 108128.

R.K. Kopparapu , R. Ramirez , J.F. Kasting , V. Eymet , T.D. Robinson , S. Mahadevan , R.C. Terrien , S. Domagal-Goldman , V. Meadows & R. Deshpande (2013). Habitable zones around main-sequence stars: new estimates. Astrophys. J. 765, 131.

A. Loeb & M. Zaldarriaga (2007). Eavesdropping on Radio Broadcasts from galactic civilizations with upcoming observatories for redshifted 21 cm radiation. Journal of Cosmology and Astroparticle Physics 2007 (1), 20.

G.E. Miller & J.M. Scalo (1979). The initial mass function and stellar birthrate in the solar neighborhood. Astrophys. J. Supp. Ser. 41, 513547.

B.H. Patel , C. Percivalle , D.J. Ritson , C.D. Duffy & J.D. Sutherland (2015). Common origins of RNA, protein and lipid precursors in a cyanosulfidic protometabolism. Nature Chemistry 7, 301307.

S. Pizzarello (2007). Question 2: why astrobiology? Orig. Life Evol. Biosph. 37, 341344.

E.V. Quintana (2014). An earth-sized planet in the habitable zone of a cool star. Science 344, 277280.

D.M. Raup & J.J. Sepkoski (1982). Mass extinctions in the marine fossil record. Science 215, 15011503.

L.A. Rogers (2015). Most 1.6 Earth-radius planets are not rocky. Astrophys. J. 801, 43.

G. Torres , (2015). Validation of 12 small Kepler transiting planets in the habitable zone. Astrophys. J. 800, 99123.

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International Journal of Astrobiology
  • ISSN: 1473-5504
  • EISSN: 1475-3006
  • URL: /core/journals/international-journal-of-astrobiology
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