http://oklo.org/2007/04/06/gj-6-7-4/ characterizing planetary systems Fri, 18 Nov 2011 22:27:52 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://oklo.org/2007/04/06/gj-6-7-4/comment-page-1/#comment-2112 systemic - Bali Hai Mon, 09 Apr 2007 05:17:42 +0000 http://oklo.org/?p=199#comment-2112 [...] No word yet on whether that newly discovered 11 Earth-mass (and possibly rocky) planet orbiting GJ 674 is transiting or not. [...] [...] No word yet on whether that newly discovered 11 Earth-mass (and possibly rocky) planet orbiting GJ 674 is transiting or not. [...]

]]> http://oklo.org/2007/04/06/gj-6-7-4/comment-page-1/#comment-2097 Borislav_ Sun, 08 Apr 2007 14:59:31 +0000 http://oklo.org/?p=199#comment-2097 total - 10 - hot neptune 4 around Ðœ, 6 around G and K star period around Ðœ - 2,5,5,3 days ; average = 4 days period around G and K - 9, 10, 3, 15, 17, 4 days ; average = 10 days radius orbits G and K - 0.1 a.u., M - 0.04 a.u. diametr Ðœ =(150/0.3)=0.002 a.u. diametr G =(1/150)=0.007 a.u. geometric probability G = 14%, M = 5% total geometric probability hot neptune = 14%*6 + 5%*4=84%+20%=104% !!! total – 10 – hot neptune
4 around М, 6 around G and K star
period around Ðœ – 2,5,5,3 days ; average = 4 days
period around G and K – 9, 10, 3, 15, 17, 4 days ; average = 10 days
radius orbits G and K – 0.1 a.u., M – 0.04 a.u.
diametr М =(150/0.3)=0.002 a.u.
diametr G =(1/150)=0.007 a.u.
geometric probability G = 14%, M = 5%
total geometric probability hot neptune = 14%*6 + 5%*4=84%+20%=104% !!!

]]> http://oklo.org/2007/04/06/gj-6-7-4/comment-page-1/#comment-2063 Centauri Dreams » Blog Archive » A New Red Dwarf Planet Fri, 06 Apr 2007 13:20:03 +0000 http://oklo.org/?p=199#comment-2063 [...] We’re not down to Earth-mass planets yet, but this is an interesting find. This is the second-closest known planetary system (after Epsilon Eridani). GJ 674 is less than 15 light years away and it’s one of the brightest M dwarfs in our field of view. That makes the transit situation interesting, as Greg Laughlin noted in this systemic post: At first glance, such an effort might appear to be hampered by the fact that the star is young enough to show significant photometric variability in synch with its 35-day rotation period. A central transit, however, would have a duration of only ~80 minutes — much shorter than starspot-induced variations — and would generate a clearly detectable dip of at least ~0.5% photometric depth. [...] [...] We’re not down to Earth-mass planets yet, but this is an interesting find. This is the second-closest known planetary system (after Epsilon Eridani). GJ 674 is less than 15 light years away and it’s one of the brightest M dwarfs in our field of view. That makes the transit situation interesting, as Greg Laughlin noted in this systemic post: At first glance, such an effort might appear to be hampered by the fact that the star is young enough to show significant photometric variability in synch with its 35-day rotation period. A central transit, however, would have a duration of only ~80 minutes — much shorter than starspot-induced variations — and would generate a clearly detectable dip of at least ~0.5% photometric depth. [...]

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