Information on resource 'Selections from Gaia Data Release 2 (DR2)'

Services defined within this resource descriptor

• Gaia DR2 light curves SSA

  This service exposes about 0.5 million light curves of stars classified as variable by the Gaia analysis system through the VO SSAP protocol. The lightcurves are published per-band and are also available through obscore.

• Gaia DR2 time series datalink

  This service gives photometric time series for the roughly 500000 objects for which Gaia DR2 gives epoch photometry. Note that this is different from the ESAC datalink service in that it gives split time series for the three Gaia bands. There is a link to the original ESAC time series in our table, though. The ids passed to this service are Gaia DR2 source ids.

• Gaia DR2-light Cone Search

Tables defined within this resource descriptor

• gaia.dr2_ts_ssa – queriable through TAP and ADQL

  This table contains about 1.5 Million photometric timeseries for roughly 0.5 Million objects. Photometry is available in the Gaia G, BP, and RP bands for epochs between 2014-07-25 and 2016-05-25. The spectra are available in VOTable format with the timeseries annotation proposed in the Nadvornik et al IVOA note.

• gaia.dr2epochflux – queriable through TAP and ADQL

  A table of the light curves released with Gaia DR2 (about half a million in total). In each Gaia band (G, BP, RP), we give epochs, fluxes and their errors in arrays. We do not include the quality flags (DR2: “may be safely ignored for many general purpose applications”). You can access them through the associated datalink service if you select source_id. You will usually join this table with gaia.dr2light.

  We have also removed all entries with NaN observation times; hence, the array lengths in the different bands can be significantly different, and the indices in transit_ids do not always correspond to the indices in the time series.

  Furthermore, we only give fluxes and their errors here rather than magnitudes. Fluxes can be turned into magnitude using::

  mag = -2.5 log10(flux)+zero point,

  where the zero points assumed for Gaia DR2 are 25.6884±0.0018 in G, 25.3514±0.0014 in BP, and 24.7619±0.0019 in RP (VEGAMAG).

• gaia.dr2light – queriable through TAP and ADQL

  This is a “light” version of the full Gaia DR2 gaia_source table, containing the original astrometric and photmetric columns with just enough additional information to let careful researchers notice when data is becomes uncertain and the full error model should be consulted. The full DR2 is available from numerous places in the VO (in particular from the TAP services ivo://uni-heidelberg.de/gaia/tap and ivo://esavo/gaia/tap).

  This table also includes a column containing the Renormalized Unit Weight Error RUWE (GAIA-C3-TN-LU-LL-124-01), a robust measure for the consistency of the solution.

  On this TAP service, there is the table gdr2dist.main containing distances computed by Bailer-Jones et al (:bibcode:`2018AJ....156...58B`). If in doubt, use these instead of the parallaxes provided here.

• gaia.ruwes

  An internal table temporarily used to insert RUWEs into dr2light. Nonexisting almost always.

Copyright, License, Acknowledgements

If you use public Gaia DR2 data in a paper, please take note of ESAC's guide on how to acknowledge and cite it.

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