Habitable Worlds Learning Goals In this activity you will explore the properties

Question

Habitable Worlds Learning Goals In this activity you will explore the properties of known extrasolar planets to determine whether they might support life. During this activity you will also: 1. Describe physical and orbital characteristics of a number of extrasolar planets. 2. Quantitatively compare characteristics of extrasolar planets to the planets in the Solar System. 3. Apply the definition of habitable zone to determine habitability of extrasolar planets. H. Summarize what life might be like on either an exoplanet or a moon of an exoplanet. Step 1-Stellar Properties Table 30.1 lists information for just a small sample of the extrasolar planets whose orbits lay all or nearly al in the habitable zone for their respective stars. Information for five Solar System planets is included for comparison. O TABLE 30.1 Comparison of orbital elements and stellar properties for selected extrasolar planets and five planets of the Solar System. PLANET NAME MINIMUM (DESIGNATION) RADIUS SEMIMAJOR PERIOD ECCENTRICITY| STAR ORBITAL MASS OF TEMPERATURE (OFSTAR (K) 0.0002 0.03 0.003 0.09 0.00030.05 0.21 365 0.0167 0.09 0.05 0.4 5778 5778 5778 5778 5778 Earth Mars 1.5 5.2 4,270 9.6 10,759 Saturn HD 10180 g HD 99109 b HD 28185b HD 73534 b HD 183263 b 55 Cac f 0.3 0.8 0067 |- 0.50 _ 1.42 1.11 11.02 3.02 1.49 0.77 0.00 0.09 0.05 0.07 1.06 0.94 0,99 1.17 1.12 0.9 5.8 1.07 3.57 0.173 439 379 1,770 5272 5656 4884 5936 5196 261 Tt ls bypothesized that Jupites s is about as large as a gaseous planet can ger becuase additional mass will tend to squeeze the planet more. Foe the planets in this sample with massesower thn that of Jupites, no radius is kown beause they do not transit thelr sas

Explanation / Answer

Question 1.

Temperature of Sun Ts = 5778 K

Hottest star Th = 5936 K

Coolest star temperature, Tc = 4884 K

Hence, % difference between hottest star and sun = (5936-5778)/5778 = 2.73 %

% difference between coolest star and sun = (4884-5778)/5778 = - 15.47 % (negative sign indicates that temperaure of star is less than sun)

So with the results it can be hypothesized that the habitable planents will be found in solar systems which have the star temperature not more than around 2.75 % and not less tha around 15.5 % of that of sun

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