Author Question: What are the measured densities of the exoplanets called hot Jupiters, and why are these densities ... (Read 68 times)

Capo · **on:** Jul 27, 2018

What are the measured densities of the exoplanets called hot Jupiters, and why are these densities inconsistent with theoretical models?

What will be an ideal response?

Question 2

A star of spectral type G lives approximately how long on the main sequence?

A) 10 billion years
B) 1 billion years
C) 10 million years
D) 1,000 years
E) 10,000 years

britb2u · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

The densities of hot Jupiters are very low, from 200 to 1500 kg/m3. This is far too low for these planets to be rocky, and, at the low end, inconsistent even with a composition of pure hydrogen and helium. Theoretical models of planetary system formation lead us to expect that light elements such as hydrogen and helium should have been expelled from the inner system; as these hot Jupiters orbit very close to their parent stars their composition is difficult to explain.

Answer to Question 2

A