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

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

Post by Sirius_Alpha on 24th August 2013, 2:41 pm

Gaia is now in French Guiana.
http://spaceref.com/news/viewpr.html?pid=41411

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

Post by Sirius_Alpha on 19th December 2013, 6:08 am

Launch was successful.
http://www.nasaspaceflight.com/2013/12/soyuz-stb-launch-gaia-space-observatory/

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

Post by Lazarus on 19th December 2013, 2:13 pm

Great news! Now let's hope the science mission is successful.
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Lazarus on 16th August 2014, 4:37 am

Perhaps some possibility of extending the bright magnitude limit?

Martín Fleitas et al. "Enabling Gaia observations of naked-eye stars"
http://arxiv.org/abs/1408.3039

Might be possible to get to G=2, though as they note the actual astrometric performance for such stars has not yet been determined.
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Lazarus on 16th October 2014, 2:35 pm

Sahlmann, Triaud & Martin "Gaia's potential for the discovery of circumbinary planets"
http://arxiv.org/abs/1410.4096

Depending on the planet population, Gaia may detect several circumbinary planets. It may also have a chance of confirming/refuting a couple of the proposed planets around post-common envelope binaries (QS Virginis being the easiest target).

The paper also mentions a couple of inclined planets detected by eclipse timing variations, anyone know any more about these?
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Lazarus on 6th November 2014, 2:46 pm

Perryman et al. "Astrometric exoplanet detection with Gaia"
http://arxiv.org/abs/1411.1173

With some plausible assumptions on planet occurrences, we find that some 21000 (±6000) high-mass (~1−15MJ) long-period planets should be discovered out to distances of ~500 pc for the nominal 5-yr mission (including at least 1000–1500 around M dwarfs out to 100 pc), rising to some 70000 (±20000) for a 10-yr mission. We indicate some of the expected features of this exoplanet population, amongst them ~25–50 intermediate-period (P ~ 2 − 3 yr) transiting systems.
That's a fairly impressive number (it would make the Kepler mission's haul look comparatively puny), we shall have to wait and see what actually turns up...
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Lazarus on 24th December 2014, 8:14 am

New Scientist: Galaxy-mapping megacamera falls victim to loose fibres

Loose fibres on the edge of the sunshield are causing too much light to enter the telescope. Expected to result in doubling of the measurement errors.
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Sirius_Alpha on 24th December 2014, 8:32 am

Ouch. That's going to hurt the planet yield...

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

Post by ThinkerX on 24th December 2014, 10:28 pm

Going to hurt the parallaxes as well. Perhaps my pet project isn't utterly in vain...

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

Post by Led_Zep on 4th February 2015, 7:04 am

http://www.cosmos.esa.int/web/gaia/iow_20150204

Gaia's potential for the discovery of circumbinary planets
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Led_Zep on 14th August 2015, 11:53 am

http://arxiv.org/abs/1508.02184

Gaia : The Astrometry Revolution


6. Summary

The Gaia mission is bound to set the standards in high-precision astrometry for the
next decade. Gaia’s defining role in the exoplanet arena will be its ability to provide
a large compilation of new, high-accuracy astrometric orbits of giant planets, unbiased
across all spectral types, alongwith exquisitely precise parallaxes. There exists a huge
synergy potential between Gaia and ongoing and planned exoplanet detection and (at-
mospheric) characterization programs, both from the ground and in space, for much im-
proved understanding of many aspects of the formation, physical and dynamical evolution
of planetary systems. We have started gauging the effectiveness of the combination of
Gaia astrometry and SPHERE high-contrast imaging for constraining masses of directly-
imaged companions around young stars in the solar neighborhood, as a means to reduce
inherent degeneracies and uncertainties in model predictions. Our preliminary findings
indicate that accelerations in Gaia astrometry for stars with companions detected by
SPHERE will be easy to spot. We have identified a potential reference metric (the mass
CDF) for the assessment of the quality of actual mass estimates without relying on model
assumptions. Future work will focus on a) quantifying the uncertainties in companion
mass estimates when other elements of information (e.g., the system age) are factored in,
and b) determining the possible improvements in mass determinations when detection of
orbital motion is obtained in both Gaia and SPHERE data.
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Led_Zep on 17th November 2015, 2:42 pm

http://www.cosmos.esa.int/web/gaia/release

Data Release scenario

An exo-planet list in 2022...
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Daniel on 3rd September 2016, 6:36 pm

GAIA DATA RELEASE 1 (GAIA DR1)

http://www.cosmos.esa.int/web/gaia/dr1
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

Post by Shellface on 14th September 2016, 12:11 pm

Welcome to the Gaia era!

http://gea.esac.esa.int/archive/

Positions for 1 billion stars and parallaxes for 2 million stars in the first release.

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

Post by Lazarus on 16th September 2016, 4:24 pm

Some results of Gaia relevant to exoplanets.

Stassun et al. "Accurate, Empirical Radii and Masses of Planets with Gaia Parallaxes"
http://arxiv.org/abs/1609.04389
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Re: Gaia, ESA new approach to discover new exoplanets and celestial body

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