Essential Cosmic Perspective
9th Edition
ISBN: 9780135795033
Author: Bennett
Publisher: PEARSON
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Chapter 10, Problem 47EAP
Transit of TrES-1. The planet TrES-1, orbiting a distant star, has been detected by both the transit and the Doppler technique, so we can ca lculate its density and get an idea of what kind of planet it is.
- Using the method of Cosmic Calculations 10.11£1, calculate the radius of the transiting planet. The planetary transits block 2% of the star's light. The star that TrES-1 orbits has a radius of about 85% of our Sun's radius.
- The mass of the planet is approximately 0.75 times the mass of Jupiter, and Jupiter's mass is about 1.9 x 1027 kilograms. Calculate the average density of the planet. Give your answer in grams per cubic centimeter. Compare this density to the average densities of Satum {0.7 g/cm3 and Earth (5.5 g/cm 3). I s the planet terrestrial or jovian in nature?
(Hint: To find the volume of the planet, use the formula for the volume of a sphere: V = ¼11'r3 • Be careful with unit conversions.)
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H5.
A star with mass 1.05 M has a luminosity of 4.49 × 1026 W and effective temperature of 5700 K. It dims to 4.42 × 1026 W every 1.39 Earth days due to a transiting exoplanet. The duration of the transit reveals that the exoplanet orbits at a distance of 0.0617 AU. Based on this information, calculate the radius of the planet (expressed in Jupiter radii) and the minimum inclination of its orbit to our line of sight.
Follow up observations of the star in part reveal that a spectral feature with a rest wavelength of 656 nm is redshifted by 1.41×10−3 nm with the same period as the observed transit. Assuming a circular orbit what can be inferred about the planet’s mass (expressed in Jupiter masses)?
Why are we unlikely to find Earth-like planets around halo stars in the Galaxy?
A. Halo stars formed in a different way from disk stars.
B. Planets around stars are known to be extremely rare.
C. Halo stars formed in an environment where there were few heavy elements to create rocky planets.
D. Halo stars do not have enough mass to hold onto planets.
Is the answer C? Since halo stars are formed early when the galaxy consisted of mainly hydrogen and helium, there are no heavier elements available to create Earth-like planets so just halo stars are formed?
Thanks!
Using the method of Mathematical Insight ’FindingSizes of Extrasolar Planets’, calculate the radius of the transiting planet. The planetary transits block 2.5 percent of thestar’s light. The star TrES-1 has a radius of about 84.5 percentof our Sun’s radius
Chapter 10 Solutions
Essential Cosmic Perspective
Ch. 10 - Prob. 1VSCCh. 10 - Prob. 2VSCCh. 10 - Prob. 3VSCCh. 10 - 4. Match the planet's po,sitions at points 1, 2,...Ch. 10 - How would the plot change if the planet were more...Ch. 10 - Prob. 1EAPCh. 10 - Prob. 2EAPCh. 10 - Prob. 3EAPCh. 10 - Prob. 4EAPCh. 10 - Prob. 5EAP
Ch. 10 - Prob. 6EAPCh. 10 - Prob. 7EAPCh. 10 - Prob. 8EAPCh. 10 - Prob. 9EAPCh. 10 - Prob. 10EAPCh. 10 - Prob. 11EAPCh. 10 - Prob. 12EAPCh. 10 - Prob. 13EAPCh. 10 - Prob. 14EAPCh. 10 - Prob. 15EAPCh. 10 - Prob. 16EAPCh. 10 - Prob. 17EAPCh. 10 - Prob. 18EAPCh. 10 - Prob. 19EAPCh. 10 - Prob. 20EAPCh. 10 - Prob. 21EAPCh. 10 - Prob. 22EAPCh. 10 - Prob. 23EAPCh. 10 - It’s the year 2025: The TESS mission has announced...Ch. 10 - Prob. 25EAPCh. 10 - Prob. 26EAPCh. 10 - 27. Which method co uld detect a planet in an...Ch. 10 - Which detection method(s) measure(s) gravitational...Ch. 10 - 29. Which one of the following can the transit...Ch. 10 - 30. To determine a planet's average density, we...Ch. 10 - 31. Based on the model types shown in Figure 10.12...Ch. 10 - Look at the dot for Jupiter in Figure 10.13, then...Ch. 10 - 33. The term "super-Earth" refers to a planet that...Ch. 10 - 34. What's the best explanation for the location...Ch. 10 - 35. Based on computer models, when is planei ary...Ch. 10 - Prob. 36EAPCh. 10 - When Is a Theory Wrong? As discussed in this cha...Ch. 10 - Unanswe,erd Questions. As discussed in this...Ch. 10 - Unanswered Questions. As discussed in this...Ch. 10 - Group Activity: Time to Move On. A common theme in...Ch. 10 - 40. Explaining the Doppler Method. Explain how the...Ch. 10 - Prob. 42EAPCh. 10 - 42. No Hot Jupiters Here. How do we think hot...Ch. 10 - 43. Low-Density Planets. Only one planet in our...Ch. 10 - Prob. 46EAPCh. 10 - Transit of TrES-1. The planet TrES-1, orbiting a...Ch. 10 - 47. Planet Around 51 Pegasi. The star 51 Pegasi...
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