Gaia Exoplanet News and Results

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Gaia Exoplanet News and Results

Post by Sirius_Alpha on 9th February 2017, 4:16 pm

Gaia has detected transits of WASP-19b and WASP-98b
http://sci.esa.int/gaia/58784-exoplanets/


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Re: Gaia Exoplanet News and Results

Post by Lazarus on 9th February 2017, 5:32 pm

Good spot there. Looking forward to seeing this thread grow longer!
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Re: Gaia Exoplanet News and Results

Post by Sirius_Alpha on 7th December 2017, 5:14 pm

Gaia mission extended through 2020.
http://sci.esa.int/director-desk/59839-green-light-for-continued-operations-of-esa-science-missions/

The lifetime of Gaia, ESA's billion star surveyor, was extended by eighteen months, from 25 July 2019 to 31 December 2020. This is the first time that Gaia, which was launched in 2013 and originally funded for a five-year mission, has been subject to the extension process.

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Re: Gaia Exoplanet News and Results

Post by Sirius_Alpha on 14th August 2018, 8:27 pm

Revised Exoplanet Radii and Habitability Using Gaia Data Release 2
https://arxiv.org/abs/1808.04533

Accurate stellar properties are crucial for determining exoplanet characteristics. Gaia DR2 presents revised distances, luminosities, and radii for 1.6 billion stars. Here, we report the calculation of revised radii and densities for 320 exoplanets using this data and present updated calculations of the incident flux received by 690 known exoplanets. This allows the likelihood that those planets orbit in the habitable zone of their host stars to be reassessed. As a result of this analysis, three planets can be added to the catalogue of potentially habitable worlds: HIP~67537~b, HD~148156~b, and HD~106720~b. In addition, the changed parameterisation of BD~+49~898 means that its planet, BD~+49~898~b, now receives an incident flux that places it outside the optimistic habitable zone region, as defined by \citep{Kopparapu2013,Kopparapu2014}. We find that use of the new \textit{Gaia} data results in a mean increase in calculated exoplanet radius of 3.76\%. Previously, CoRoT-3 b had been reported as having the highest density of all known exoplanets. Here, we use updated information to revise the calculated density of CoRoT-3~b from 26.4gcm−3 to 17.3▒2.9gcm−3. We also report the densest exoplanet in our dataset, KELT-1~b, with a density of 23.7▒4.0gcm−3. Overall, our results highlight the importance of ensuring the the parameterisation of known exoplanets be revisited whenever significant improvements are made to the precision of the stellar parameters upon which they are based.

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Re: Gaia Exoplanet News and Results

Post by Edasich on 15th August 2018, 9:46 am

According to this study HATS-12 b turns out a high-density planet more than twice the mass of Jupiter but with nearly Neptune-size radius. Possible??
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Re: Gaia Exoplanet News and Results

Post by tommi59 on 15th August 2018, 10:53 am

No envelope? rocky?
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Re: Gaia Exoplanet News and Results

Post by Lazarus on 15th August 2018, 1:21 pm

From the paper:
It is important to note that HATS-12s Gaia luminosity decreased to 12% of its previous value, so it is likely that the mass of HATS-12, and mass and density of HATS-12 b, also decreased

Using a na´ve extrapolation from the mass-luminosity relationship I get a revised mass of 1.7 Jupiter masses, which would still be a rather unusual planet. It probably warrants a full reanalysis to do it properly. Furthermore, Gaia DR2 stellar properties are rather preliminary so this is unlikely to be the last word on things. Gaia DR3 will probably revise everything all over again...
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