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51 Pegasi b exoplanet

Posted: Tue Sep 09, 2014 12:07 am
by Christian Buil
(une partie de mon été astronomique c'est concentrée sur l'observation de la planète extrasolaire 51 Peg b, après une première détection en 1999. J''ai chercher à améliorer la précision et on commence à s'approcher de ce que font nombre de professionnels, sans aller tout de même rivaliser avec des HARPS, mais quant même... il y a du potentiel).

A two month run for detect presence of the famous extrasolar planet around 51 Peg.... The telescopes used are a C9 and a C11. The spectrograph is VHIRES-MO (R = 50000).

The result:

Image

The phase curve:

Image

and the comparison with the historical Mayor and Queloz observation (Nature, 1993):

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VHIRES-MO in action at Pic du Midi observatory on the T60 during phase test, just before 2014 OHP spectroscopy workshop:

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See also more on the webpage: http://www.astrosurf.com/buil/exoplanet2/51peg.htm

The field of aplications is considerable.

Christian

Re: 51 Pegasi b exoplanet

Posted: Tue Sep 09, 2014 6:26 am
by Olivier GARDE
Vraiment génial comme manip Christian, et cela me motive d'autant plus à réaliser un VHIRES "maison".

Re: 51 Pegasi b exoplanet

Posted: Tue Sep 09, 2014 8:25 am
by Jacques Montier
Bravo Christian,
Quel magnifique travail !
Reproduire une manip avec un télescope de 28cm et un spectro fait maison alors qu'il y a 19 ans il fallait un 193 cm et le spectro ELODIE...
Que doivent en penser les pros ? ;)

Re: 51 Pegasi b exoplanet

Posted: Tue Sep 09, 2014 9:59 am
by Francois Teyssier
Je me joins au concert de louanges.
C'est trés fort et ta page est passionnante
Amitiés
François

Re: 51 Pegasi b exoplanet

Posted: Tue Sep 09, 2014 11:17 am
by Robin Leadbeater
Hi Christian,

10-20 m/s 3 sigma is very impressive ! The skill of the observer must be an important factor (Do you know if anyone has repeated the 2005 eShel observations?) What would you say is the main contributor to the error now? spectrograph stability? SNR ?

Cheers
Robin

Re: 51 Pegasi b exoplanet

Posted: Tue Sep 09, 2014 9:55 pm
by Christian Buil
J'ai corrigé quelques dates dans la page, effectivement Mayor et Queloz c'était en 1995, presque 20 ans !

Robin, I am for the moment the only amateur observers of exoplanets (?) but this paper is for encourage change (I hope !).

The main limitation is actually the stabiltity of the spectrograph (influence of temperature is very critical). I pubish here in some days a demonstration...

Christian

Re: 51 Pegasi b exoplanet

Posted: Thu Sep 11, 2014 10:37 am
by Filipe Dias
Very very impressive. with special emphasis on the pivoting fans used to "jitter" the "modal noise"...
I got curious about this noise, about this solution, and about how much improvement such solution would bring...

But I also admire the presence of solar, lunar and diurnal shifts clearly visible in the data!

Re: 51 Pegasi b exoplanet

Posted: Sat Sep 20, 2014 11:35 am
by Christian Buil
The final result of my 51 Peg campaign, extended to september 2014.

Image

The phase curve:

Image

Christian

Re: 51 Pegasi b exoplanet

Posted: Sat Sep 20, 2014 1:31 pm
by Alexandre Santerne
Jacques Montier wrote:Que doivent en penser les pros ? ;)
Les pros sont assez impressionnés, en France comme à Genève … ;)