Timeline for delivery of data products to the ESO archive

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Data releases are subject to the following constraints and opportunities.

  • A large fraction of stars are observed in more than one GIRAFFE wavelength setting, very often with more than one integration per setting. Spectrum analysis must wait until all observations are available for a specific target and have the relevant signal to noise ratio (SNR);
  • For clusters, star by star analysis has requirements as above, while full analysis requires complete observations on all cluster targets;
  • Gaia-ESO invests considerable effort in calibration. The science requirement is to be reliable, inevitably at the cost of time invested. The calibration will improve with Survey progress. Reliable advanced data products must await acquisition and analysis of calibration targets. Similarly, as calibration increases and improves, the Gaia-ESO Survey will derive and deliver revised astrophysical parameters from early observations;
  • A strength of the Gaia-ESO Survey spectrum analyses is implementation of many techniques. This identifies systematic method-dependent effects to complement the random errors. Iterative parameter homogenization and quality control is required to converge on final parameters. Considerable post-analysis effort is required to deliver this advanced product.

The data products delivered from the Gaia-ESO Survey will be made public in three steps/categories (see Data products).

Semester Advanced Data Product

Releases Half-yearly deliveries to ESO of reduced 1-D spectra, associated variance spectra, radial velocities (RVs), variability information, and basic data for all targets for which data collection is completed to the relevant SNR six months before the data release. The first half-yearly data release will occur one year after official start of the operations (t0 +12 months); first observations (t0) are scheduled for the night 31-12-2011. Thus, the first data release is scheduled for 01/2013 and will contain data for all targets for which data taking is complete prior to 30-06-2012. Nine semester data releases are anticipated.

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Annual Advanced Data Product Releases

Four annual data releases to ESO of value added data products, including astrophysical parameters, element abundances, complementary data as appropriate, and uncertainties, for all targets for which data collection is completed to the relevant SNR six months prior to the data release. The first annual data release is scheduled for (t0+18 months) 06/2013 (P91). The first annual data release will contain data for all targets for which data taking is complete prior to 31-12-2012.

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Final Advanced Data Product Release

A final data release, involving the full determinable set of astrophysical parameters for each individual target, and for the open clusters as systems, with updated and consistent calibration, as described in Data products. This final data release is expected to be no later than 24 months following final data taking.

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While it is beyond the control of this project, current expectation is that the first major Gaia data release will become public around the time of Gaia-ESO Survey Data Release 3, allowing substantial scientific synergy between Gaia-ESO and Gaia. If Gaia data are available prior to the final data release of the Gaia-ESO Survey, explicit linking of each target to Gaia data will be provided. If Gaia data are later, linking through Virtual Observatory (VO) protocols at the Gaia-ESO archive will be implemented.


Page last updated: 19/03/2013