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University of North Florida *

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2002

Subject

Astronomy

Date

Feb 20, 2024

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Uploaded by DrMetalLeopard9

= 202380.AST2002.82741 > Quizzes > Exoplanets (Quiz) Exoplanets (Quiz) a* Questions Started: Oct 14 at 10:23 i Question 4 ripy it +/ Question 2 Quiz Instructions + Question 3 @ Spacer Make sure you have read through and watched the videos for Exoplanets before attempting this quiz. +/ Question 4 You have three attempts on this quiz. Only your highest score will be kept. Note that the questions may change +/ Question 5 between attempts. Time Running: = Hide Time Specific Learning Goals: Attempt due: Oct 15 at 11:59pm 1 Hour, 50 Minutes, 21 Seconds 1. Describe the observable properties of exoplanets and how they are measured. 2. Describe how extrasolar planetary systems compare with our solar system. [ Question 1 1pts With a very accurate spectrometer you graph the doppler shift of lines in a star's spectrum as they move back and forth revealing the orbit of a single exoplanet around this star. Given the figure below, with the black filled circle marking the current radial velocity of the star's lines, at which of the positions is the planet currently located? Note the arrow indicating the direction toward Earth, from where you are observing this star. Orbit of planet Remember, blue is towards you, red is away. C Question 2 1pts Graphs of radial velocity as a function of time are shown for four stars with exoplanets. Assume that the stars are identical and are orbited by identical planets. For which case would you expect the planet to be orbiting closest to the star? Velocity (m/s) & 2 Velocity (m/s) Velocity (m/s) Velocity (m/s) [ Question 3 1pts Below are drawings of three different exoplanet orbits. The masses of the planets and stars are provided along with the distance between them. Which star has the most redshifted spectrum (i.e. largest velocity)? Recall that the orbital velocity of a planet around a star is proportional to the square root of the star's mass divided by the orbital distance of the planet: V' = \/ Misar R 3d Fal 2023 Home oc Syllabus @8 Announcements D A [2$) Assignments D all have the same redshift Dashboard Grades (5] Modules Courses People C Use this light curve of a star with a transiting exoplanet to answer the following questions. Pages |Quizzes Learner Support Resources Learner Support Resources 0 s 10 15 20 2 30 35 Time (months) Zoom Question 4 1pts If the exoplanet is orbiting a star identical to our own Sun, what is its average orbital distance (in other words, its orbital semi-major axis)? Give your answer in AU. 0 Question 5 1pts What is the period in years of the transiting exoplanet? Quiz saved at 10:32pm

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