Timeline for What starting circumstances have to be for "grand tack" hypothesis to work, and why they are lacking in other planet systems(as far as we know)?
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13 events
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| Jun 19, 2016 at 20:43 | vote | accept | gytis | ||
| Jun 19, 2016 at 16:16 | history | edited | ProfRob | CC BY-SA 3.0 |
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| Jun 19, 2016 at 11:51 | comment | added | ProfRob | @gytis But the inner one at 0.2 au only has a claimed RV amplitude of 3 m/s, which illustrates the selection effects I'm talking about - detection of this (and it would be even harder if it were at 1 au) is close to the limits of what is possible. And at 0.05 Mjupiter, it is more Neptune-mass than Super-earth. | |
| Jun 19, 2016 at 11:46 | comment | added | ProfRob | @gytis Possibly searching on radius is not a good idea (I am surprised there are any), since determination of radius requires a transit. exoplanets.org lists 43 systems with Msini>0.5 Jupiter masses and period between 2,000 and 10,000 days. Finding a shorter period, much lower mass planet in these systems is more difficult, nevertheless a number of these planets are in multiple planetary systems. To pick one at random - HD 204313 appears to have a "super-Earth" interior to a couple of Jupiter-things in 6-8 year orbits. exoplanet.eu/catalog/?f=%27HD%20204313%20%27+in+name | |
| Jun 19, 2016 at 10:31 | comment | added | gytis | Is there any data about jupiter-sized planets with jupiter-sized orbits being in the same planet system with super-earth type of planets? I ran a simple search in exoplanet catalog, came up with only 9 planets fitting my parameters(radius>0.5 jupiter and period > 5 years). None of them had super-earths in their systems. This would be consistent with grand-tack, as far as i understand. | |
| Jun 19, 2016 at 7:42 | history | edited | ProfRob | CC BY-SA 3.0 |
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| Jun 19, 2016 at 7:33 | comment | added | ProfRob | @gytis And there are plenty of doppler-discovered, Jupiter-sized planets in Jupiter-sized orbits. | |
| Jun 19, 2016 at 7:27 | comment | added | ProfRob | @gytis Right, now we know where this is coming from. See my answer. The selection effects are far too strong to say that there is anything particularly unusual about the solar system. | |
| Jun 19, 2016 at 7:12 | comment | added | gytis | I was under impression from http://www.reasons.org/articles/recent-research-strengthens-the-creation-friendly-grand-tack-model that somehow this hypothesys explains what we see in exoplanets. The exact wording was "The fine-tuning inherent in the Grand Tack model is consistent with the observation that no other of the 1,293 planetary systems in the exoplanet catalog (maintained by the exoplanet team) comes close to mimicking the characteristics of ours". | |
| Jun 19, 2016 at 6:51 | comment | added | ProfRob | @gytis Yes, it is true that many (but a lot less than 100%) stars have larger planets than the Earth orbiting closer than the Earth. I am no longer sure what your question is. | |
| Jun 19, 2016 at 2:53 | comment | added | gytis | But as far as i understand, we dont need to see earth size exoplanets to suspect that some planet system might be similar to ours. All we need is some jupiter size body(it would be seen, right?) in a respectable distance from its star and a bunch of empty space inside its orbit. Then we could suspect that there are smaller terrestrial planets there. Meanwhile, we mostly find super-earth size bodies pretty close to their stars, which makes those planet systems completely not like ours. | |
| Jun 18, 2016 at 16:56 | history | edited | ProfRob | CC BY-SA 3.0 |
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| Jun 18, 2016 at 14:39 | history | answered | ProfRob | CC BY-SA 3.0 |