by iamlucky13 » Sat Oct 14, 2006 12:26 am
Bob, for your second hypothesis, unless I misunderstand it somehow, the intensity would actually increase slightly as the smaller planet lined up with the big planet and the star. The total shadowed area would be the area of just the big planet, as opposed to the area of the big planet plus the little planet as the alignment breaks a little bit.
For your first hypothesis, you are correct. In fact, the transit method probably has the best chance for any method of detecting small planets because they don't have enough mass to induce a noticeable wobble. The Kepler space observatory will actually be a dedicated mission lasting several years using the same method as this 7 day Hubble observation, and has the potential to find thousands of planets, some as small as the earth.
For those interested, I believe 6 of these planets have been confirmed using the wobble method.
Andyrint, I believe a planet's magnetic field has a significant effect on how fast gas "evaporates" (actually is blown away by the solar wind) from a gas giant. A planet with a strong magnetic field should be able to survive for a long time.
Bob, for your second hypothesis, unless I misunderstand it somehow, the intensity would actually increase slightly as the smaller planet lined up with the big planet and the star. The total shadowed area would be the area of just the big planet, as opposed to the area of the big planet plus the little planet as the alignment breaks a little bit.
For your first hypothesis, you are correct. In fact, the transit method probably has the best chance for any method of detecting small planets because they don't have enough mass to induce a noticeable wobble. The Kepler space observatory will actually be a dedicated mission lasting several years using the same method as this 7 day Hubble observation, and has the potential to find thousands of planets, some as small as the earth.
For those interested, I believe 6 of these planets have been confirmed using the wobble method.
Andyrint, I believe a planet's magnetic field has a significant effect on how fast gas "evaporates" (actually is blown away by the solar wind) from a gas giant. A planet with a strong magnetic field should be able to survive for a long time.