Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Chapter 10 Homework
| Question | Answer |
|---|---|
| Which of the following is a major reason why it so difficult to obtain direct images of extrasolar planets? | The light of the planets is overwhelmed by the light from their star. |
| Suppose you are using the Doppler method to look for planets around another star. What must you do? | Compare many spectra of the star taken over a period of many months or years. |
| In general, which type of planet would you expect to cause the largest Doppler shift in the spectrum of its star? | a massive planet that is close to its star |
| Consider a planet orbiting a Sun-like star that has been detected by the Doppler and that has an orbital period of one year. The larger the velocity changes measured for the star, the __________. | the larger the mass of the planet |
| Which detection method or methods measure the gravitational tug of a planet on its star, allowing us to estimate planetary mass? | the astrometric and Doppler methods |
| What is an extrasolar planet? | A planet that orbits a star that is not our own Sun |
| The transit method searches for extrasolar planets by ____________. | monitoring stars for slight dimming that might occur as unseen planets pass in front of them |
| This graph shows the brightness of a star over the course of a transit. Which of the following do we learn about the planet? | It is large enough to block about 2.5% of the star’s light. |
| The term "super-Earth" refers to a planet that is | similar in composition to Earth but larger in size. |
| Using the method of finding sizes of extrasolar planets in the textbook, calculate the radius of the transiting planet. The planetary transits block 2 % of the star's light. The star TrES-1 has a radius of about 85 % of our Sun's radius. | rplanet = 8.4×10^4 km |
| The mass of the planet is approximately 0.75 times the mass of Jupiter, and Jupiter's mass is about 1.9×1027 kilograms. Calculate the average density of the planet. Give your answer in grams per cubic centimeter. | ρplanet = 0.58 g/cm^3 |
| Compare this density to the average densities of Saturn (0.7 g/cm3 ) and Earth (5.5 g/cm3 ). Is the planet likely to be terrestrial or jovian in nature? | The planet is jovian, such density obviously implies the composition of hydrogen and helium. |
| Use Kepler's third law to calculate the planet's average distance (semimajor axis) from its star. (Hint: Because the mass of 51 Pegasi is about the same as the mass of our Sun, you can use Kepler’s third law in its original form, p2=a3 | a =5.12×10^−2 AU |
| What do we mean by a “hot Jupiter”? | a planet that is Jupiter-like in size but orbits very close to its star |
Created by:
ava.h14