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Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial - like planet This zone depends on: – the spectraltype , the mass , the age, …. of the star – the orbit of the planet – the mass, the composition, the atmosphere , ……of the planet – the parameters of other planets in this system (mass, orbit, …)

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Page 1: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Habitable Zone

Zone around a star where liquid water can exist on the surface of a terrestial-like planet

This zone depends on:– the spectraltype , the mass , the age, …. of the star

– the orbit of the planet

– the mass, the composition, the atmosphere , ……of the planet

– the parameters of other planets in this system (mass, orbit, …)

Page 2: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Literaturliste

Gilmour & Sephton: An introduction to Astrobiology, Cambridge

Ward & Brownlee: Rare Earth (Unsere einsame Erde); Springer

Goldsmith & Owen: The Search of Life in the Universe, University science books

Ulmschneider: Intelligence Life in the Universe; Springer

de Pater & Lissauer: Planetary Sciences; Cambridge

Page 3: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Huang (1959, 1960)

führte den Begriff „habitable zone“

Dole (1964), Shklovski & Sagan (1966)

sprachen von „ecosphere“

Region um einen Stern, wo sich auf

einem Planeten Leben entwickeln

kann.

Page 4: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype
Page 5: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Sonnenentwicklung

Leuchtkraft der Sonne (Lo) nimmt zu:

hatte zu Beginn 0.71 von Lo

wird ca. 3xLo haben am Ende der

Hauptreihenphase

ca. 300Lo in der Roten Riesen Phase

und wächst auf 6000 Lo an in der AGB

Phase

Page 6: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Sonnenentwicklung:

Iben 1967 u. 1974

Newman & Rood 1977

Gough 1981

Iben & Renzine 1983

Gilliland 1989

Page 7: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Änderung der Sonnenenergie

-> Änderung der effektiven Temp.

Page 8: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype
Page 9: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

based on

the

definition

given by

Kasting et

al.

(1993).

Size of the habitable zone

Page 10: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

HZ im Sonnensystem (Kasting)

innere Grenze:

0.95 AU (Wasserdampf bildet sich in der Stratosphäre), bzw.

0.85 AU (Temperaturanstieg infolge eines runaway greenhouse-Effekts)

äußere Grenze bei 1.37 AU (Bildung von CO2-Wolken)

CHZ zwischen 0.95 und 1.15 AU

Page 11: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype
Page 12: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Habitable Zone & Star Evolution

CHZ = continuously habitable zone

= Bereich der über mehrere Jahrmilliarden in der HZ liegt (Sternentwicklung!)

Page 13: Habitable Zone - univie.ac.at€¦ · Habitable Zone Zone around a star where liquid water can exist on the surface of a terrestial-like planet This zone depends on: –the spectraltype

Types of Habitable Zones:

(1)Hot-Jupiter type

(2) Solar system type

(3)+(4) giant planet type: habitable moon

or trojan planet


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