Gaia, ESA new approach to discover new exoplanets and celestial body

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Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Roland Borrey on 26th September 2010, 1:29 am

Gaia the next in line ESA space telescope will monitor the star position working at almost all sin i. If it work the number of new exoplanet will go to the roof. cheers

Gaia will conduct a census of a thousand million stars in our Galaxy, monitoring each of its target stars about 70 times over a five-year period. It will precisely chart their positions, distances, movements, and changes in brightness. It is expected to discover hundreds of thousands of new celestial objects, such as extra-solar planets and failed stars called brown dwarfs. Within our own Solar System, Gaia should also observe hundreds of thousands of asteroids.

That might be interesting not hunderd but 10th of thousands. Shocked
See it at:http://www.esa.int/esaSC/120377_index_1_m.html#subhead0
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Borislav on 26th September 2010, 3:41 am

Yes, Roland, this mission could be the first project, which will discovery more than a thousand of confirmed exoplanets. Astrometric planets will not need to validate ground-based telescopes. But will not until 2020, when the collected data GAIA be analyzed.

Here are some pictures about the possibilities of mission.

http://www.rssd.esa.int/SA/GAIA/docs/info_sheets/IN_all_info_sheets.pdf






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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Borislav on 26th September 2010, 5:25 am

In addition, the latest news on the project
http://www.spacedaily.com/reports/Delivery_Of_Gaia_Primary_Mirrors_999.html
Launch of Gaia on a Soyuz-Fregat is currently scheduled for November 2012.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Roland Borrey on 26th September 2010, 10:05 pm

In the lengthy paper presenting the expected Gaia capabilities, It points out that the system would be capable to discover all hot jupiter in a 30 to 60 parsec around the sun or 350K stars. If the "hot Jupiter" statistics are correct at 0.6 to 1% this would mean 2500 to 3500 "hot Jupiter".
I ran a quick calculation and assuming that a hot jupiter moves its star by 150K KM or 1/2 sec they should be able to do the 60 PC.

This result should come 2 years after launch or 2014.
But hot Jupiter are bad sign for the other planets. At least we would know where not to look
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 26th September 2010, 10:11 pm

Hot Jupiters are hard to detect through astrometry because while the radial velocity reflex motion is high, the barycentric semi-major axis of the star is not. The star wobbles around furiously but never deviates far from the system barycentre, resulting in a very low astrometric detectability.

I would argue Gaia will be ill-equipped to detect hot Jupiters through astrometry.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Roland Borrey on 26th September 2010, 11:27 pm

You are right, Embarassed Embarassed I ran my numbers again and I got 1Ly for Gaia threshold detection for a hot Jupiter ( obviouly no use), they need 100 times more or 15M km deviation to be able to detect the star deviation at 100 ly.The planet need to be 100 times futher or more like 400 M km, that is more like our own Jupiter.
That will not be published before 2020.
Damn
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Borislav on 27th September 2010, 1:36 am

In addition, the project can detect short-periodic transits of the planets. See my link above.

Certainly 10 years is a long time. But there are many other projects that will discovery up a lot of planets in the coming years. Roland may read this section forum. Smile

For example I can name more than a dozen projects that are search for rocky planets.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Roland Borrey on 27th September 2010, 1:00 pm

You are right Boris, a lot of projects, but few have the capability to come up with 10K planets.
The ground telescope search should be made just a complementary of the space telescope search. An example that I like, is the one of the 2 Saturn planets recently discovered by Kepler. A few RV reading was enough to confirm them, anthe rest can be deducted from the ongoing measurements.
In the near future it will make almost no sense of measuring so many parameters for the planets and spend so much time on one.
The system will be overflowing with it, Kepler is the proof of that 700 candidates and they cannot handle it, what about 10.000 or 100.000.
They are as many planets as there is stars. as the volume grows, the planet research need to become a lot smarter

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Borislav on 27th September 2010, 1:47 pm

Roland Borrey wrote:You are right Boris, a lot of projects, but few have the capability to come up with 10K planets.

I think its a great need for a huge number of planets are not. Now the focus more to the statistical study of the frequency of different types of planets around different types of stars, not their detailed study.

So, for me personally interesting to discover all of the planet within a radius for example of 10 parsecs by using a combination of the method of radial velocities, astrometry and the photographic method, than thousands of confirmed planets around distant stars.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Roland Borrey on 28th September 2010, 11:23 am

I believe that what we need now is a good solid planetary science and theory; for this we need a lot of planets, several hunderds for each type around each stars, that is 10K+ planets. Working with only a few dozen will leads to wrong assumption and will never answer Drake's equation.
To solve this we should build ASAP 5 Kepler craft looking at different area of the galaxy, the price of such project will be small since it is just a dupliction.

With that in hands you should be able to predict where they are and which planets exist.
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Borislav on 28th September 2010, 12:09 pm

Roland Borrey wrote:To solve this we should build ASAP 5 Kepler craft looking at different area of the galaxy, the price of such project will be small since it is just a dupliction.

ESA is developing a more advanced mission PLATO (with a possible launch in 2017-2018).

http://en.wikipedia.org/wiki/PLATO_(spacecraft)

For example the comparison area sky survey of Plato, Kepler and Corot.
http://online.kitp.ucsb.edu/online/exoplanets10/udry2/oh/46.jpg
http://online.kitp.ucsb.edu/online/exoplanets10/udry2/oh/47.jpg

Comparing the number of planets which can be measured by the mass of Kepler and Plato.
http://online.kitp.ucsb.edu/online/exoplanets10/udry2/oh/49.gif

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Roland Borrey on 29th September 2010, 12:18 am

Yes Boris,only 8 years to wait
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 30th November 2010, 9:11 pm

White Dwarf Planets from GAIA
http://arxiv.org/abs/1011.6493

We investigate the potential of high-precision astrometry with GAIA for detection of giant planetary companions to nearby white dwarfs. If one considers that, to date, no confirmed planets around single white dwarfs are known, the results from GAIA will be crucial to study the late-stage evolution of planetary systems and to verify the possibility that 2nd-generation planets are formed.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 15th December 2010, 9:09 pm

Astrometry and Exoplanets: the Gaia Era, and Beyond
http://arxiv.org/abs/1012.3346

The wealth of information in the Gaia catalogue of exoplanets will constitute a fundamental contribution to several hot topics of the astrophysics of planetary systems. I briefly review the potential impact of Gaia micro-arsec astrometry in several areas of exoplanet science, discuss what key follow-up observations might be required as a complement to Gaia data, and shed some light on the role of next generation astrometric facilities in the arena of planetary systems.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by jumpjack on 25th January 2011, 11:36 am

I found this cool image on wikipedia:
http://en.wikipedia.org/wiki/File:Solar_system_barycenter.svg

Is it possibile to figure out from such a graph how many planets orbit around a star, how far, how big,...?

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 25th January 2011, 1:12 pm

Yes. That is essentially what astrometric detection of exoplanets is all about. The time it takes for the star to complete one circular motion is the orbital period, which tells you how far the planet is from the star. The width of the barycentric orbit tells you the planet's mass (more massive planets tug the star more than lower mass planets). Having multiple planets causes overlapping motions like that graph there.
As for determining how many planets the star has, you would only be able to detect planets above a certain mass (with more sensitivity toward longer orbital periods). That is determined by your telescope. Astrometrically detecting Mercury would be a very challenging task, for example.

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 1st January 2012, 4:15 pm

GAIA Spreads its Wings

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Lazarus on 12th February 2012, 12:10 pm

One thing to note is that there is an upper brightness limit of the stars observed by GAIA, the magnitude range it is surveying is V~6 to V~20.
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 17th April 2012, 5:06 pm

Gaia Basic Angle Monitor delivered for integration
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=50207

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sunchaser on 18th April 2012, 10:12 pm

The fun begins...

-M-
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 22nd May 2012, 8:20 pm

Expect hundreds to thousands of transiting gas giants from GAIA.

Detection of transiting Jovian exoplanets by Gaia photometry - expected yield
http://arxiv.org/abs/1205.4725

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 6th July 2012, 9:20 am

Gaia Phased Array Antenna delivered and integrated
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=50523

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 29th October 2012, 5:36 pm

Gaia launcher separation test and Payload Module acceptance vibration tests completed
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=51007

(a small video of the separation test plays on auto-load, so be ready for sound!)

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Lazarus on 25th November 2012, 6:04 pm

Sirius_Alpha wrote:Expect hundreds to thousands of transiting gas giants from GAIA.

Detection of transiting Jovian exoplanets by Gaia photometry - expected yield
http://arxiv.org/abs/1205.4725
More on the potential of Gaia to detect transiting planets:

Directed follow-up strategy of low-cadence photometric surveys in Search of transiting exoplanets - I. Bayesian approach for adaptive scheduling
http://arxiv.org/abs/1105.5393

Directed follow-up strategy of low-cadence photometric surveys in Search of Transiting Exoplanets - II. application to Gaia
http://arxiv.org/abs/1211.4876
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 19th June 2013, 2:53 pm

The Gaia Spacecraft Flight Model has successfully completed its mass properties test campaign
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=51921

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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

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