seager {extraterrestrial}

The Seager 2013 equation

Description

An alternative to the Drake 1961 equation. The Seager equation considers the detection biogenic gases in the estimation of planets harboring life.

Usage

seager(Ns, fQ, fHZ, fo, fL, fS)

Arguments

Ns

number of stars

fQ

fraction of quiet stars

fHZ

fraction with rocky planets within the habitable zone.

fo

fraction of observable planets.

fL

fraction of planets with life.

fS

fraction of planets with detectable gaseous signatures.

Value

N number of planets with signs of life.

References

https://www.cfa.harvard.edu/events/2013/postkepler/Exoplanets_in_the_Post_Kepler_Era/Program_files/Seager.pdf

The Drake Equation Revisited: Interview with Planet Hunter Sara Seager Devin Powell, Astrobiology Magazine 4 September 2013.

Examples

seager(Ns=.45, fQ=0.5, fHZ=0.2, fo=0.05, fL=0.5, fS=500)