51 Pegasi b exoplanet

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Christian Buil
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51 Pegasi b exoplanet

Post 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):

Image

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

Image

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

The field of aplications is considerable.

Christian
Olivier GARDE
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Re: 51 Pegasi b exoplanet

Post by Olivier GARDE »

Vraiment génial comme manip Christian, et cela me motive d'autant plus à réaliser un VHIRES "maison".
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Jacques Montier
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Re: 51 Pegasi b exoplanet

Post 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 ? ;)
--
Jacques Montier
Societe d'Astronomie de Rennes
IAU code J23
Francois Teyssier
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Re: 51 Pegasi b exoplanet

Post by Francois Teyssier »

Je me joins au concert de louanges.
C'est trés fort et ta page est passionnante
Amitiés
François
Robin Leadbeater
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Re: 51 Pegasi b exoplanet

Post 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
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Christian Buil
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Re: 51 Pegasi b exoplanet

Post 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
Filipe Dias
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Re: 51 Pegasi b exoplanet

Post 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!
Fil
Christian Buil
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Re: 51 Pegasi b exoplanet

Post by Christian Buil »

The final result of my 51 Peg campaign, extended to september 2014.

Image

The phase curve:

Image

Christian
Alexandre Santerne
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Re: 51 Pegasi b exoplanet

Post by Alexandre Santerne »

Jacques Montier wrote:Que doivent en penser les pros ? ;)
Les pros sont assez impressionnés, en France comme à Genève … ;)
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