Title: Week 5 Quiz
Course: ASTRON103: The Evolving Universe: Stars, Galaxies, and Cosmology (001) DHH SU18 > Section: Week 5

Q: What is the transit depth that would be observed if a Jupiter sized planet were to pass in front of an M dwarf star that is 0.25 times the radius of our Sun?

Show your work.

Q: Why were giant planets close to their stars (often called Hot Jupiters) the first ones to be discovered? Why has the same technique not been used yet to discover giant planets at the distance of Saturn?

Q: Two stars form together in a binary system. One star is 3 Solar Masses and the other star is 8 Solar Masses.

Which star will evolve off of the main sequence first? Explain the differences between the final stages of both stars at the end of their evolutionary tracks.

Q: Suppose no stars more massive than about 2 M_Sun had ever formed. Would life as we know it have been able to develop? Why or why not?

Q: You observe two clusters of stars, Gamma and Delta. Gamma is filled with many G and K stars much like our own Sun. Delta has a handful of O and B stars that dominate the clusters brightness. Compare the ages of the star clusters and explain your reasoning.

Q: Would you be more likely to observe a type II supernova in a globular cluster or in an open cluster? Why?

Q: Suppose you were able to acquire a small pendant that is 6 mm^3 in size and made up of the same material as a neutron star. What would be the mass of this pendant? Show your work.

Q: The figure below shows how the main sequence turn-off point can be used to estimate the age of a cluster of stars. Briefly explain in your own words why this turn-off point is a good indicator of age.

Q: If a transit depth of 0.00001 can be detected with the Kepler spacecraft, what is the smallest planet that could be detected around a 0.25 R_sun (1/3 the radius of our Sun) M dwarf star? Show your work.

Q: If we were to magically replace our Sun with the supergiant star, Betelgeuse, how many planets in our Solar System would be inside of the star itself? (Hint: Compare the semi-major axis of the planets to the Stars Radius). Clearly state the values that you find and convert to answer this question.