Step 3-Habitable Zones A common definition of the habitable zone is that it is t

Question

Step 3-Habitable Zones A common definition of the habitable zone is that it is the range of distances from the central star in which liquid water might exist on the surface of a planet if the planet has a dense enough atmosphere. As under these criteria Earth is habitable, the Sun must have a habitable zone as well One estimate of the Sun's habitable zone is shown in Figure 30.2. The light-gray shaded areas depict the conservative estimate of the habitable zone, while the dark-gray shaded areas show more optimistic estimates of the inner and outer boundaries of the habitable zone. The optimistic estimate includes an area about halfway between the orbits of Earth and Venus (inner edge) and the distance of Mars's orbit at the planet's aphelion. The conservative estimate starts just inside Earth's orbit and extends out to Mars's orbit at the planet's perihelion distance. 8. The full details of the orbits of the selected extrasolar planets are listed in Table 30.2, along with the conservative and optimistic estimates of the habitable zones. The sketches of the estimated habitable zones for the six extrasolar planets are shown in Figure 30.3. Four of the extrasolar planets have orbits that lie completely within the conservative estimate for the habitable zone of their star. Which planets are these?

Explanation / Answer

Question 8: The planets which lie completely in habitable zone are as follows:

i) HD 10180 g

ii) HD 99109 b

iii) HD 28185 b

iv) HD 73534 b

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