Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 21, Problem 11E
Why did it take astronomers until 1995 to discover the first exoplanet orbiting another star like the Sun?
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In the Transit method for detecting exoplanets, how many dips of light from the star need to be detected for it to be a successful detection of an exoplanet?
The NASA Kepler mission detected a transiting planet that blocks 1.3% of the stars light and the host star has a radius 82% of the Sun's radius (the Sun has a radius of 700,000 km) what is the radius of the exosolar planet in km?
Describe the Doppler Method of searching for exoplanets.
Chapter 21 Solutions
Astronomy
Ch. 21 - Give several reasons the Orion molecular cloud is...Ch. 21 - Why is star formation more likely to occur in cold...Ch. 21 - Why have we learned a lot about star formation...Ch. 21 - Describe what happens when a star forms. Begin...Ch. 21 - Describe how the T Tauri star stage in the life of...Ch. 21 - Look at the four stages shown in Figure 21.8. In...Ch. 21 - The evolutionary track for a star of 1 solar mass...Ch. 21 - Two protostars, one 10 times the mass of the Sun...Ch. 21 - Compare the scale (size) of a typical dusty disk...Ch. 21 - Why is it so hard to see planets around other...
Ch. 21 - Why did it take astronomers until 1995 to discover...Ch. 21 - Which types of planets are most easily detected by...Ch. 21 - List three ways in which the exoplanets we have...Ch. 21 - List any similarities between discovered...Ch. 21 - What revisions to the theory of planet formation...Ch. 21 - Why are young Jupiters easier to see with direct...Ch. 21 - A friend of yours who did not do well in her...Ch. 21 - Observations suggest that it takes more than 3...Ch. 21 - Suppose you wanted to observe a planet around...Ch. 21 - Why were giant planets close to their stars the...Ch. 21 - Exoplanets in eccentric orbits experience large...Ch. 21 - When astronomers found the first giant planets...Ch. 21 - An exoplanetary system has two known planets....Ch. 21 - Kepler’s third law says that the orbital period...Ch. 21 - Calculate the transit depth for an M dwarf star...Ch. 21 - If a transit depth of 0.00001 can be detected with...Ch. 21 - What fraction of gas giant planets seems to have...
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- List three ways in which the exoplanets we have detected have been found to be different from planets in our solar system.arrow_forwardList any similarities between discovered exoplanets and planets in our solar system.arrow_forwardWhat revisions to the theory of planet formation have astronomers had to make as a result of the discovery of exoplanets?arrow_forward
- Which of the following is not a very useful method for detecting an exoplanet? (16.8) (a) the observation of a stars motion (b) the observation of Doppler shifts in the spectrum of a star (c) the detection of alien electromagnetic signalsarrow_forwardWhat is the exoplanet doing when the light we detect from the star begins to increase from the least amount of light to the greatest amount of light?arrow_forwardWhich of these views cannot be used when trying to detect exoplanets using the radial velocity method? XYZ all of these can be observed using the radial velocity method none of these can be observed using the radial velocity method? X Y Z all of these can be observed using the radial velocity method none of these can be observed using the radial velocity method Figure X to Earth Figure Y to Earth Figure Z to Earth Which of the systems above could not be detected using the transit method?arrow_forward
- What appears to be the most common size of exoplanets? Jupiter size Neptune size Mini-Neptune size Earth and super-Earth size.arrow_forwardIf Exoplanets A and B are orbiting their host stars at similar distances and we know that the host star for exoplanet A emits peak radiation at 400 nm, while the radiation at exoplanet B’s star peaks at 1920 nm, in the absence of other information, which exoplanet would be warmer, and why?arrow_forwardExoplanets have many kinds, and we like to put them in boxes based on some properties such as mass, radius, and distance from their host star. Fill in the blank. A planet that is 5 times the massive of Jupiter, and orbits at 0.1 au from its central star, is a type of exoplanetarrow_forward
- Use this light curve of a star with a transiting exoplanet to answer the following. If the exoplanet is orbiting a star identical to our own Sun, what is its average orbital distance, in AU? What is the period in years of the transiting exoplanet? Use this light curve of a star with a transiting exoplanet to answer the following questions. Brightness 0 V V V B 5 10 15 20 Time (months) 25 30 35arrow_forwardWhat are the four main challenges that need to be overcome as scientists come together to try to get a probe to an exoplanetarrow_forwardAn exoplanetary system has two known planets. Planet X orbits in 290 days and Planet Y orbits in 145 days. Which planet is closest to its host star? If the star has the same mass as the Sun, what is the semi-major axis of the orbits for Planets X and Y?arrow_forward
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