Comments on: A Habitable Earth http://oklo.org/2007/06/17/a-habitable-earth/ characterizing planetary systems Wed, 18 Apr 2012 18:53:22 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Philosophia Naturalis #11: Powers of 11 [Highly Allochthonous] · New York Articles http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2745 Philosophia Naturalis #11: Powers of 11 [Highly Allochthonous] · New York Articles Fri, 06 Jul 2007 23:08:34 +0000 http://oklo.org/?p=224#comment-2745 [...] …and we’re closing in on the Earth-like ones. [...] [...] …and we’re closing in on the Earth-like ones. [...]

]]> By: Philosophia Naturalis #11: Powers of 11 [Highly Allochthonous] · Articles http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2717 Philosophia Naturalis #11: Powers of 11 [Highly Allochthonous] · Articles Tue, 03 Jul 2007 17:34:17 +0000 http://oklo.org/?p=224#comment-2717 [...] …and we’re closing in on the Earth-like ones. [...] [...] …and we’re closing in on the Earth-like ones. [...]

]]> By: Philosophia Naturalis #11: Powers of 11 [Highly Allochthonous] · Kokorec http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2694 Philosophia Naturalis #11: Powers of 11 [Highly Allochthonous] · Kokorec Thu, 28 Jun 2007 16:07:05 +0000 http://oklo.org/?p=224#comment-2694 [...] …and we’re closing in on the Earth-like ones. [...] [...] …and we’re closing in on the Earth-like ones. [...]

]]> By: greg http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2683 greg Mon, 25 Jun 2007 05:56:23 +0000 http://oklo.org/?p=224#comment-2683 Hey Pieter, The estimate is based on the (more-or-less) known rate at which the radial velocity observations are being accumulated by the various teams, and on the (theoretically completely reasonable) expectation that 1-Earth mass planets will be just as common as the 5-Earth mass planets that are already turning up around the nearby red dwarf stars. Assigning a one-sigma error bar pins down my sense of the uncertainty, but it was also slightly tongue-in-cheek for the benefit of the blogosphere. I do think there's an 85% chance that we'll have a habitable Earth within three years. The real question is who's going to get there first... Greg Hey Pieter,

The estimate is based on the (more-or-less) known rate at which the radial velocity observations are being accumulated by the various teams, and on the (theoretically completely reasonable) expectation that 1-Earth mass planets will be just as common as the 5-Earth mass planets that are already turning up around the nearby red dwarf stars. Assigning a one-sigma error bar pins down my sense of the uncertainty, but it was also slightly tongue-in-cheek for the benefit of the blogosphere.

I do think there’s an 85% chance that we’ll have a habitable Earth within three years. The real question is who’s going to get there first…

Greg

]]> By: pvanes http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2682 pvanes Mon, 25 Jun 2007 00:04:42 +0000 http://oklo.org/?p=224#comment-2682 Greg: Interesting stuff. You say that we’re currently 2±1 years away from the detection of the first habitable Earth-mass plane. How do you go about calculating that? Also, what is the certainty that we will find one with 3 years? (85%?) Greg:

Interesting stuff. You say that we’re currently 2±1 years away from the detection of the first habitable Earth-mass plane. How do you go about calculating that? Also, what is the certainty that we will find one with 3 years? (85%?)

]]> By: Eric F Diaz http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2677 Eric F Diaz Sat, 23 Jun 2007 14:28:06 +0000 http://oklo.org/?p=224#comment-2677 In case anyone was wondering what the mass of Earth would be if it were expressed in terms of Jupiter's mass, 1.0 Earth mass is equal to 0.003144 of Jupiter's mass. Just thought you'd like to know in the event that you're searching for one of those "habitable Earths" around one of those red dwarfs. Eric In case anyone was wondering what the mass of Earth would be if it were expressed in terms of Jupiter’s mass, 1.0 Earth mass is equal to 0.003144 of Jupiter’s mass.

Just thought you’d like to know in the event that you’re searching for one of those “habitable Earths” around one of those red dwarfs.

Eric

]]> By: Dynamics of Cats http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2670 Dynamics of Cats Wed, 20 Jun 2007 18:30:12 +0000 http://oklo.org/?p=224#comment-2670 <strong>Habitable ExoPlanet: Any Time Now</strong> We expect to start finding habitable extrasolar planets any time now Habitable ExoPlanet: Any Time Now

We expect to start finding habitable extrasolar planets any time now

]]> By: Centauri Dreams » Blog Archive » Interstellar Conundrum: Is Stross Right? http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2661 Centauri Dreams » Blog Archive » Interstellar Conundrum: Is Stross Right? Tue, 19 Jun 2007 19:14:54 +0000 http://oklo.org/?p=224#comment-2661 [...] Yep, better have plenty of peas for that Centauri trip. As Stross says, the distances are mind-numbing. But I’ll differ slightly on his take on Proxima, which he describes as “…a poor choice, if we’re looking for habitable real estate. While exoplanets are apparently common as muck, terrestrial planets are harder to find.” He may well be right, but we do have planet hunter Greg Laughlin (UC Santa Cruz, who just the other day said this in his systemic blog in the context of a proposed HARPS search for Proxima planets: “Proxima is effortlessly old, adequately quiet, and metal-rich. If our understanding of planet formation is first-order correct, it has several significant terrestrial-mass planets.” [...] [...] Yep, better have plenty of peas for that Centauri trip. As Stross says, the distances are mind-numbing. But I’ll differ slightly on his take on Proxima, which he describes as “…a poor choice, if we’re looking for habitable real estate. While exoplanets are apparently common as muck, terrestrial planets are harder to find.” He may well be right, but we do have planet hunter Greg Laughlin (UC Santa Cruz, who just the other day said this in his systemic blog in the context of a proposed HARPS search for Proxima planets: “Proxima is effortlessly old, adequately quiet, and metal-rich. If our understanding of planet formation is first-order correct, it has several significant terrestrial-mass planets.” [...]

]]> By: Eric F Diaz http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2659 Eric F Diaz Tue, 19 Jun 2007 13:59:36 +0000 http://oklo.org/?p=224#comment-2659 Hi Greg, Given the cost that you mentioned above of surveying for several weeks a red dwarf in search of a potential habitable Earth using VLT or Keck, I can see why you would have to be very prudent in your choice of candidates and pretty darn sure that it's worth the gamble. Thanks for enlightening us. best, Eric Hi Greg,

Given the cost that you mentioned above of surveying for several weeks a red dwarf in search of a potential habitable Earth using VLT or Keck, I can see why you would have to be very prudent in your choice of candidates and pretty darn sure that it’s worth the gamble. Thanks for enlightening us.

best,
Eric

]]> By: greg http://oklo.org/2007/06/17/a-habitable-earth/comment-page-1/#comment-2652 greg Sun, 17 Jun 2007 23:48:24 +0000 http://oklo.org/?p=224#comment-2652 Hi Andy, NIKKI, That's an interesting point regarding the availability of the spectra... Gl 849 is indeed a notable red dwarf planet, but I left it out because I was more interested in discussing the progression to lower and lower mass red-dwarf companions. Gl 849 is interesting because it bucks the trend toward an apparent paucity of true Jovian-mass companions to red dwarf stars (as do Gl 876 b and c). best, Greg Hi Andy, NIKKI,

That’s an interesting point regarding the availability of the spectra…

Gl 849 is indeed a notable red dwarf planet, but I left it out because I was more interested in discussing the progression to lower and lower mass red-dwarf companions.

Gl 849 is interesting because it bucks the trend toward an apparent paucity of true Jovian-mass companions to red dwarf stars (as do Gl 876 b and c).

best,
Greg

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