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ASTR 3730: Astrophysics 1 Problem Set #6 Due in class Friday Dec 14th

Summary: ASTR 3730: Astrophysics 1 Problem Set #6
Due in class Friday Dec 14th
1) Consider a transiting hot Jupiter planet orbiting a Solar mass star. The star has
a radius of 7 x 1010
cm, while the planet has a radius of 8.5 x 109
(i) Sketch the lightcurve (flux vs time) that you would expect to see during the
(ii) Calculate the maximum depth of the transit, expressed as a percentage of the
unobscured flux from the star.
(iii) If the smallest change in stellar flux that can be detected is 1 part in 104
(0.01%), what is the smallest radius moon that could be detected around the
planet? Sketch the lightcurve that you would expect to see if the planet had a
large moon.
(iv) Even outside the transit, the flux from the star will display a (very) small
variation due to the differing amounts of light reflected from the planet toward
the observer. For a planet with an orbital period of 3 days, calculate the orbital
radius a and hence estimate the magnitude (in percent) of this reflected light
2) The most popular model for the short duration gamma-ray bursts is that these


Source: Armitage, Phil - Department of Astrophysical and Planetary Sciences, University of Colorado at Boulder


Collections: Physics