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PostPosted: Fri Sep 23, 2011 12:45 pm 
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Terrestrial, Habitable-Zone Exoplanet Frequency from Kepler

Preliminary, but interesting; "terrestrial" in the sense of radius 0.5 < rE < 2.0 (implies ~0.1 < mE < ~10).

Oh, the Answer: "Thus about one-third of FGK stars are predicted to have at least one terrestrial, habitable-zone planet."


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PostPosted: Sun Sep 25, 2011 10:29 pm 
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Location: the Retirement Coast, NSW, Australia
This contrasts with Dole's figures ranging from 7% for K1 stars to 63% for F0–G4 stars.

How does this paper define the habitable zone? Do they treat the inner edge as defined by insolation or by tidal braking?

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PostPosted: Mon Sep 26, 2011 9:07 am 
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Location: Sonthofen / Germany
Agemegos wrote:
How does this paper define the habitable zone?

Chapter 10 of the paper, which can be downloaded though the link above,
explains their concept of the habitable zone.

The core sentences are:
Quote:
There is general agreement that the HZ is defined as the planet-star distance range
within which liquid water can exist on a planet’s surface. The surface temperature of
a planet is a function of stellar luminosity, albedo, greenhouse effect, eccentricity,
obliquity, rotation rate, and geologic age. Of these, only the first parameter can be
estimated for the Kepler planets. To encompass the effect of the remaining parame-
ters, this paper adopts three ranges that have been proposed to date ...


They are followed by examples and formulas for wide, average and narrow
habitable zone models.


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PostPosted: Fri Sep 30, 2011 3:34 am 
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Posts: 168
This paper is a pretty awesome bit of statistical astronomy. Ripe for sci-fi gaming.

Thanks for posting it!


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