Comments on: HD 17156 b http://oklo.org/2007/09/04/hd-17156-b/ characterizing planetary systems Fri, 18 Nov 2011 22:27:52 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Jose Manuel http://oklo.org/2007/09/04/hd-17156-b/comment-page-1/#comment-3316 Jose Manuel Thu, 13 Sep 2007 17:17:09 +0000 http://oklo.org/?p=242#comment-3316 Hi Greg, I observed HD17156 in the transit window. Unfortunately the night was windy, affecting the small telescope so the photometry is not so clear as we would wish. Anybody else observed? It's possible that I have a central transit. I can show you some plots if you want. I will try to observe again on december 3 (I think that is my next opportunity). Regards, Jose Hi Greg,

I observed HD17156 in the transit window. Unfortunately the night was windy,
affecting the small telescope so the photometry is not so clear as we would wish. Anybody else observed?

It’s possible that I have a central transit. I can show you some plots if you want.
I will try to observe again on december 3 (I think that is my next opportunity).

Regards,
Jose

]]> By: systemic - HD 17156 at inferior conjunction (right now!) http://oklo.org/2007/09/04/hd-17156-b/comment-page-1/#comment-3302 systemic - HD 17156 at inferior conjunction (right now!) Mon, 10 Sep 2007 00:38:40 +0000 http://oklo.org/?p=242#comment-3302 [...] It’s 01:58 UT Sep. 10, and HD 17156 has moved into its transit window. Hopefully photometric transit observers across Europe have clear skies. If you’re collecting data, drop us a note on the comments page! [...] [...] It’s 01:58 UT Sep. 10, and HD 17156 has moved into its transit window. Hopefully photometric transit observers across Europe have clear skies. If you’re collecting data, drop us a note on the comments page! [...]

]]> By: andy http://oklo.org/2007/09/04/hd-17156-b/comment-page-1/#comment-3292 andy Tue, 04 Sep 2007 16:56:10 +0000 http://oklo.org/?p=242#comment-3292 Would a 500 K object be able to form water clouds? If I take a look at <a href="http://www.lsbu.ac.uk/water/phase.html" rel="nofollow">this phase diagram of water</a>, it seems the pressure at which water condenses at 500 K is a few tens of atmospheres, but wouldn't the planet be warmer at that depth? <a href="http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2003ApJ...588.1121S&db_key=AST&nosetcookie=1" rel="nofollow">Sudarsky et al. (2003)</a> states that "H2O will condense homogeneously at temperatures below ~250 K". Would a 500 K object be able to form water clouds? If I take a look at this phase diagram of water, it seems the pressure at which water condenses at 500 K is a few tens of atmospheres, but wouldn’t the planet be warmer at that depth?

Sudarsky et al. (2003) states that “H2O will condense homogeneously at temperatures below ~250 K”.

]]> By: greg http://oklo.org/2007/09/04/hd-17156-b/comment-page-1/#comment-3290 greg Tue, 04 Sep 2007 14:54:23 +0000 http://oklo.org/?p=242#comment-3290 Hi Luis, Thanks very much for that link! That's quite an informative blog article, and it sounds like CoRoT is doing a a very good job. It'll be very interesting to see more details with respect to their 33-day transiting planet. That object will be right on the ~500K borderline of being able to form water clouds in its atmosphere, and may even be cycling back and forth between clear and cloudy weather. I'll do my best to get the word out worldwide regarding the HD 17156 opportunity on the 10th. I'd have a ready-made systemic post if an ad-hoc group of small telescope observers were to scoop a 150-million Euro mission ;) best, Greg Hi Luis,

Thanks very much for that link! That’s quite an informative blog article, and it sounds like CoRoT is doing a a very good job.

It’ll be very interesting to see more details with respect to their 33-day transiting planet. That object will be right on the ~500K borderline of being able to form water clouds in its atmosphere, and may even be cycling back and forth between clear and cloudy weather.

I’ll do my best to get the word out worldwide regarding the HD 17156 opportunity on the 10th. I’d have a ready-made systemic post if an ad-hoc group of small telescope observers were to scoop a 150-million Euro mission ;)

best,
Greg

]]> By: luis http://oklo.org/2007/09/04/hd-17156-b/comment-page-1/#comment-3289 luis Tue, 04 Sep 2007 09:35:17 +0000 http://oklo.org/?p=242#comment-3289 Hi Greg, actually, I think someone attempting this must hurry. The COROT project informally announced at the European Planetary Science Conference that they have a 33 day period transiting planet candidate. It seems that they are already doing the radial velocity follow-up of the candidate. Check out this blog entry: http://www.planetary.org/blog/article/00001089/ Cheers, Luis Hi Greg,

actually, I think someone attempting this must hurry. The COROT project informally announced at the European Planetary Science Conference that they have a 33 day period transiting planet candidate. It seems that they are already doing the radial velocity follow-up of the candidate.

Check out this blog entry:

http://www.planetary.org/blog/article/00001089/

Cheers,

Luis

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