Astronomy C

boomvroomshroom · Post by **boomvroomshroom** » Mon Feb 23, 2015 8:47 pm

Question marathon for Astronomy.

boomvroomshroom · Post by **boomvroomshroom** » Mon Feb 23, 2015 8:48 pm

Starting question: Pretend you are an alien observing our solar system. What is the transit probability for Jupiter, our largest planet?

Post by **Techsam** » Mon Mar 09, 2015 7:35 am

Thanks for starting the Astronomy Question Marathon boomvroomshroom!

Here is what I believe to be the solution to the question you asked:

To calculate the geometric transit probability of a planet you use the equation: Probability = d*/(2a) where d* is the stellar diameter (=0.0093 AU for the Sun) and a is the planet's orbital radius.

The probability for Jupiter will therefore be = .0093/(5.2*2) = .0894%

boomvroomshroom · Post by **boomvroomshroom** » Mon Mar 09, 2015 9:07 am

Correct! Your turn.

Post by **Techsam** » Mon Mar 09, 2015 9:57 am

Given the black-body radiation curve of Star X, what is the temperature of Star X in Kelvin?

Post by **finagle29** » Mon Mar 09, 2015 12:40 pm

My answer (Click to Show Hidden Text)

Using Wien's Displacement Law,  [math]T_{eff}=\frac{b}{\lambda_{max}}=\frac{2.989\times 10^{-3}\,\rm{mK}}{0.4\,\rm{\mu m}}=7245\, \rm{K}[/math]

Post by **Techsam** » Mon Mar 09, 2015 12:43 pm

Correct! Great use of Latex too, I'm impressed

boomvroomshroom · Post by **boomvroomshroom** » Wed Mar 11, 2015 2:58 pm

Reviving this thread...

Define a hot Jupiter and a super earth. How are they same/different from those in our solar system?

Post by **Techsam** » Thu Mar 12, 2015 3:31 pm

boomvroomshroom wrote:Reviving this thread...

Define a hot Jupiter and a super earth. How are they same/different from those in our solar system?

My Answer (Click to Show Hidden Text)

A hot jupiter is a massive gas planet, much like jupiter, but its orbit has drifted closer to the transiting star and has heated up. (Massive planets like Jupiter can also generate their own heat due to their gravitational attracting). Super earths refer to planets that resemble earth, but at much more massive probably around 2-5 times as massive. This planets orbit in the habitable zones, and are assumed to be rocky and contain water on the surface. Large gaseous planets in out solar system (Saturn, Jupiter, Uranus, and Neptune) are found in the outer regions, and the rocky planets (Mercury, Venus, Earth, Mars) are found to orbit in the inner regions. Hot Jupiters differ because they orbit much closer to their parent star, which made astronomers rethink the solar system formations.

boomvroomshroom · Post by **boomvroomshroom** » Thu Mar 12, 2015 3:49 pm

Techsam wrote:
boomvroomshroom wrote:Reviving this thread...

Define a hot Jupiter and a super earth. How are they same/different from those in our solar system?
My Answer (Click to Show Hidden Text)
A hot jupiter is a massive gas planet, much like jupiter, but its orbit has drifted closer to the transiting star and has heated up. (Massive planets like Jupiter can also generate their own heat due to their gravitational attracting). Super earths refer to planets that resemble earth, but at much more massive probably around 2-5 times as massive. This planets orbit in the habitable zones, and are assumed to be rocky and contain water on the surface. Large gaseous planets in out solar system (Saturn, Jupiter, Uranus, and Neptune) are found in the outer regions, and the rocky planets (Mercury, Venus, Earth, Mars) are found to orbit in the inner regions. Hot Jupiters differ because they orbit much closer to their parent star, which made astronomers rethink the solar system formations.

Correct. Your turn!

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