tag:blogger.com,1999:blog-7485863064099307059.post4699630773607477060..comments2023-07-05T03:52:39.388-07:00Comments on Back Alley Astronomy: A New Design for Planetary SystemsBucky Harrishttp://www.blogger.com/profile/09846756737418704132noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-7485863064099307059.post-34353127081253158862014-03-08T11:04:25.839-08:002014-03-08T11:04:25.839-08:00Yes, I like that study by Kevin Schlaufman - "...Yes, I like that study by Kevin Schlaufman - "Tests of In-Situ Formation Scenarios for Compact Multiplanet Systems." The 0.06% estimate is interesting. There's another similar article on planet formation by Sean Raymond and Christophe Cossou -- "No universal minimum-mass extrasolar nebula: evidence against in situ accretion of systems of hot super-Earths" (http://adsabs.harvard.edu/doi/10.1093/mnrasl/slu011). Bucky Harrishttps://www.blogger.com/profile/09846756737418704132noreply@blogger.comtag:blogger.com,1999:blog-7485863064099307059.post-29576664078653356032014-03-03T03:22:45.489-08:002014-03-03T03:22:45.489-08:00Nice discussion!
There's an interesting paper...Nice discussion!<br /><br />There's an interesting paper on planetary formation models out today on arXiv:<br /><br />http://arxiv.org/abs/1402.7075<br /><br />This seems to agree that in-situ formation doesn't fully explain things (nor does the planetesimal migration model) and that migration is still needed to explain these compact systems:<br /><br />"migration is still a necessary step in the formation of systems of close-in low-mass planets"<br /><br />Another VERY interesting finding (though *highly* speculative, it isn't that far from your 1.5%):<br /><br />"true Solar System analogs with both a terrestrial planet in the habitable zone and a long-period giant planet companion to protect it occur around only 0.06% of solar-type stars"<br /><br />... but this still means 4 million solar system analogues<br /><br />--- Tony Jebson<br />Anthonyhttps://www.blogger.com/profile/07749308966477749305noreply@blogger.com