Comments on: pseudo-synchronization http://oklo.org/2006/12/11/pseudo-synchronization/ characterizing planetary systems Fri, 18 Nov 2011 22:27:52 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: systemic - “With all possible expedition” http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-2473 systemic - “With all possible expedition” Mon, 21 May 2007 02:02:56 +0000 http://oklo.org/?p=176#comment-2473 [...] Gl 436 b’s high eccentricity means that, like Jupiter’s moon Io, it’s experiencing a lot of tidal heating. It’s internal luminosity is likely of order 10^20 Watts, which is in the rough ballpark of the amount of energy that the planet intercepts from the red dwarf parent star. Another interesting consequence of the non-zero eccentricity is that “b” will have a pseudo-synchronous spin period. That is, tidal forces will have forced the planet into a rotational period of 2.29 days, which allows it to optimally show one face to the star during the peri-astron passages when the tidal forces are strongest. Jonathan Langton has done a simulation of the surface flow pattern (assuming a water-vapor atmosphere). The following 1.1MB animations (“eastern” view, and “western” view) trace two full orbits in the planet’s frame, and show the slow synodic drift of the baking daylit hemisphere. [...] [...] Gl 436 b’s high eccentricity means that, like Jupiter’s moon Io, it’s experiencing a lot of tidal heating. It’s internal luminosity is likely of order 10^20 Watts, which is in the rough ballpark of the amount of energy that the planet intercepts from the red dwarf parent star. Another interesting consequence of the non-zero eccentricity is that “b” will have a pseudo-synchronous spin period. That is, tidal forces will have forced the planet into a rotational period of 2.29 days, which allows it to optimally show one face to the star during the peri-astron passages when the tidal forces are strongest. Jonathan Langton has done a simulation of the surface flow pattern (assuming a water-vapor atmosphere). The following 1.1MB animations (“eastern” view, and “western” view) trace two full orbits in the planet’s frame, and show the slow synodic drift of the baking daylit hemisphere. [...]

]]> By: systemic - The Perfect Storm http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-2197 systemic - The Perfect Storm Fri, 20 Apr 2007 23:18:40 +0000 http://oklo.org/?p=176#comment-2197 [...] With its eccentricity of 0.3, HD 185269b should have long since been delivered into a state of spin pseudosynchronization, in which it spins roughly three times on its axis for every two trips around the parent star. This state of affairs prevents a steady state flow pattern from developing, and hence the weather on this world is likely to be much more interesting than on your standard-issue tidally circularized hot Jupiter. Furthermore, the amount of energy absorbed by the planet is 345% greater at periastron than at apastron, which will also contribute to a strong “seasonal” variation during the planet’s 6.838-day year. [...] [...] With its eccentricity of 0.3, HD 185269b should have long since been delivered into a state of spin pseudosynchronization, in which it spins roughly three times on its axis for every two trips around the parent star. This state of affairs prevents a steady state flow pattern from developing, and hence the weather on this world is likely to be much more interesting than on your standard-issue tidally circularized hot Jupiter. Furthermore, the amount of energy absorbed by the planet is 345% greater at periastron than at apastron, which will also contribute to a strong “seasonal” variation during the planet’s 6.838-day year. [...]

]]> By: systemic - HD 118206… http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-1939 systemic - HD 118206… Sun, 18 Mar 2007 01:09:25 +0000 http://oklo.org/?p=176#comment-1939 [...] In looking over the latest officially published additions to the catalog of extrasolar planets, I noticed that there’s a very interesting object — HD 118203b — that straddles the extremes of the circular hot Jupiters and the ultra-eccentric HD 80606b. This planet was discovered in 2005 by the Swiss Team, has an orbital period of 6.13 days, a mass at least twice that of Jupiter, and a well-determined eccentricity, e=0.3. HD 118203b therefore won’t be spin-synchronous. Rather, as is also the case with HD 80606b (see the diagram here), it’ll have been forced into a state of pseudo-synchronous rotation, in which it does its best to keep one face toward the star during the periastron passage. Its day should be 64.8% as long as its year: [...] [...] In looking over the latest officially published additions to the catalog of extrasolar planets, I noticed that there’s a very interesting object — HD 118203b — that straddles the extremes of the circular hot Jupiters and the ultra-eccentric HD 80606b. This planet was discovered in 2005 by the Swiss Team, has an orbital period of 6.13 days, a mass at least twice that of Jupiter, and a well-determined eccentricity, e=0.3. HD 118203b therefore won’t be spin-synchronous. Rather, as is also the case with HD 80606b (see the diagram here), it’ll have been forced into a state of pseudo-synchronous rotation, in which it does its best to keep one face toward the star during the periastron passage. Its day should be 64.8% as long as its year: [...]

]]> By: systemic - …and then the clouds lifted http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-1008 systemic - …and then the clouds lifted Wed, 31 Jan 2007 01:15:56 +0000 http://oklo.org/?p=176#comment-1008 [...] I drove up to Berkeley yesterday to give a talk about my second-favorite planet — HD 80606 b. A good fraction of the keynote slides in the talk were new, and so I wound up spending most of the weekend scrambling to get my story straight and to get the talk together. [...] [...] I drove up to Berkeley yesterday to give a talk about my second-favorite planet — HD 80606 b. A good fraction of the keynote slides in the talk were new, and so I wound up spending most of the weekend scrambling to get my story straight and to get the talk together. [...]

]]> By: gregas http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-829 gregas Fri, 05 Jan 2007 19:30:08 +0000 http://oklo.org/?p=176#comment-829 Hi Greg Do you know of any attempts to "catch" 0606. I considered it for a second but my wife and family talked me out of it. Happy New Year Hi Greg

Do you know of any attempts to “catch” 0606.
I considered it for a second but my wife and family talked me out of it.

Happy New Year

]]> By: Hungry4info http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-625 Hungry4info Tue, 19 Dec 2006 04:54:52 +0000 http://oklo.org/?p=176#comment-625 I probably sound like a perfectionist... but... Using the formula you posted, I got 1.53596885. Rounding to three places, you get 1.536, not 1.535. I mean no disrepsect, as I have the highest reverence for your work here. Excellent site, very uplifting information, beautiful work. Keep it up. I probably sound like a perfectionist… but… Using the formula you posted, I got 1.53596885.
Rounding to three places, you get 1.536, not 1.535. I mean no disrepsect, as I have the highest reverence for your work here.

Excellent site, very uplifting information, beautiful work. Keep it up.

]]> By: greg http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-599 greg Mon, 11 Dec 2006 17:32:11 +0000 http://oklo.org/?p=176#comment-599 Hi Andy, Drake Deming and I are going to submit a proposal for the next cycle... Hi Andy,

Drake Deming and I are going to submit a proposal for the next cycle…

]]> By: andy http://oklo.org/2006/12/11/pseudo-synchronization/comment-page-1/#comment-598 andy Mon, 11 Dec 2006 13:58:06 +0000 http://oklo.org/?p=176#comment-598 You mention Spitzer here... are there actually plans to observe HD 80606 with Spitzer during the upcoming periastron passage? You mention Spitzer here… are there actually plans to observe HD 80606 with Spitzer during the upcoming periastron passage?

]]>