The Gaia-ESO Survey – November 2017 Progress Report

The Gaia-ESO Survey – November 2017 progress report

1) Survey observations progress 2) iDR5 products internal release 3) Plans for iDR6 4) Reports to ESO and Phase 3 releases 5) Science projects and publications 6) Jobs

The Gaia-ESO Public Spectroscopic Survey started more than 5 years ago, and was celebrated with Newsletter Number 1. This is Newsletter 8, where we summarize the progress made since March 2017. We remind everyone that all the Survey policy, progress, and activity is recorded on the Survey wiki, available at http://great.ast.cam.ac.uk/GESwiki/GESHome. An account there will keep you up to date. More general information is also available on the public web pages http://www.gaia-eso.eu

1. Survey observation progress

320 nights have been completed; the final 20 ones have been scheduled in November and December 2017, and January 2018. The night of January 25-26 2018 will be the last of the Survey, after six years. These last three runs will be mostly dedicated to open cluster observations. No updates are needed on the cluster sample and MW fields observed up to now, since no new observations were performed since our last Newsletter in March 2017. Up to date information on the observing runs, and the survey progress and observed fields is available at the WG0 wiki. A list of the observed open clusters and calibration targets is also available there. A list of cluster targets still to be observed can be found on WG4 wiki, where also the relevant information and reports on the clusters and cluster targets can be found.

The sky distribution of Gaia-ESO Survey observed fields for observations up to and including iDR5 broken down by field-type: Milky Way fields (MW), clusters (CL), standards and calibration fields (SD).

2. iDR5 products internal release

iDR5, the fifth full run through the whole Gaia-ESO data cycle, has been completed. The file produced by WG15 with recommended parameters and abundances has been made available at the beginning of November. Final release through the GES Science Archive at WFAU will occur soon1. Final sanity checks are underway – try the site! iDR5 encompasses the analysis or re-analysis of all spectra observed up to December 2015, adding up to 12400 UVES and 135000 GIRAFFE spectra for 83000 individual objects. The table of recommended products includes radial velocities for almost all the 83,000 targets, astrophysical parameters (effective temperature, surface gravity and/or the gamma index) for about 65,000, [Fe/H] for about 53,000 stars, and abundances for up to 25,000 stars. The list of open clusters for which iDR5 products are available is shown at the end of this Newsletter. Note that, besides parameters and abundances, accretion rates and chromospheric activity information are also available for a fraction of cluster stars. On the other hand, due to persisting problems in the processing, rotational velocities (vsini) are available for UVES targets only; vsini values for stars observed with the Giraffe HR15N setup can be retrieved from the OACT node table2, and used in science analyses, without asking for permission from the PIs.

Mg1 – [Fe/H] versus [Fe/H] alpha element distribution from the WG15 Recommended results from Gaia-ESO iDR5. The results are colour-coded by the Working Group which produced them (offsets have been applied to some results). The blue points are the GIRAFFE results from WG10, the black points are the high-resolution UVES results from WG11, the red are from the young clusters group, WG12, and the magenta are from the hot-star group, WG13.

1 ges.roe.ac.uk

2 The OACT node table will be available in the iDR5 release in the GES Science Archive at WFAU, in the AstroAnalysis table (nodeName like 'OACT'). Example queries will be updated for iDR5.

3. Plans for iDR6

The next (and final) internal release of spectra and metadata to the spectrum analysis working groups, iDR6, will happen at the beginning of Spring 2018. iDR6 will include all Gaia-ESO Survey spectra acquired up to the end of last run, archival ESO (or other observatories) spectra of calibrators, and archival ESO FLAMES/UVES spectra of a number of old open cluster members. These extra clusters are important to achieve detailed coverage of the age- Galactocentric distance-metallicity parameter space. Inclusion of open cluster archival data in the dataset analysed by the Gaia-ESO consortium was originally recommended by the OPC, is foreseen in the Survey Management Plan, and will further increase the legacy value of the cluster survey. Selection of the clusters to be downloaded was further refined based on the quality of the archival spectra and of consistency of the target selection with that for the Gaia-ESO targets.

Based on quality control from iDR5, the reduction teams are further improving the reduction pipelines and the radial velocity and vsini determination pipelines.

As discussed at the Catania all-hands Survey team meeting we also expect that the nodes will take the opportunity to improve their codes where needed, taking into account feedback that has been provided by the WG leads at the end of iDR5. After a first phase of quality control, a technical meeting with the spectrum analysis WGs and the nodes will be held in Arcetri to discuss all the challenges of this last analysis run, including the possible use of Gaia DR2 priors.

We anticipate that iDR6 will be completed by Spring 2019, delivering the full Gaia-ESO Survey data set for your science analyses.

Before this final iDR6 processing, we will have available, and distributed for internal survey analyses, the astrophysical parameters and abundances from the special CoRoT and K2 calibration samples. The optimised CoRoT analyses are nearing completion, with several iterations between the asteroseismology analyses, constraining log g values, and astrophysical parameter and element abundance determinations completed. Final homogenisation will be completed shortly. Comparable iterative analyses for the K2 sample is making good progress and is also at the stage of homogenisation of parameters, after iterations between spectrum analysis nodes and the K2 team. These, together with Gaia DR2 data will allow a significant strengthening of our internal (WG15) homogenization processes, as well as cross-calibration with other surveys observing the same samples.

We finally mention that there have been some changes to the structure of the analysis working groups during iDR5. Alejandra Recio-Blanco stepped down as co-lead of WG10 at the end of the parameter analysis phase. We would like to thank her for her significant contribution to the Survey during the first five analysis cycles. Clare Worley carried out homogenisation of the WG10 abundances during iDR5 and will take over as co-lead of

WG10 for iDR6, with Carlos Allende-Prieto remaining as co-lead. Francesco Damiani joined WG15 as a consultant on young cluster results. There have also been several changes at the node level, with new members joining node analysis teams and new nodes contributing to the analysis.

4. Reports to ESO and Phase 3 releases

Our full annual report on Survey progress to the ESO OPC was delivered for P101 (November 2017) and is available on the GES wiki home page. These reports provide detailed Survey progress information. Phase 3 releases: The third Phase III release to ESO started in August 2016 and was completed recently. The data are public at: http://archive.eso.org/wdb/wdb/adp/phase3_spectral/form/ (spectra; select Collection GAIAESO) http://www.eso.org/qi/ (catalogue) Reduced spectra, metadata, radial velocities, stellar parameters, and element abundances from our iDR4 cycle were released, with sample selection based on quality thresholds. Two sets of spectra were released; namely those spectra which were analysed to derive the published iDR4 parameters, and the (improved) iDR5 re-reduction of the same spectra. The detailed content of the release can be found in the release description document available at the ESO site and on our wiki. The 4th ESO Phase III data release will be based on the current iDR5 processing cycle.

5. Science projects and publications

The September 2017 Catania all-hands meeting was very successful; science projects still based on iDR4, as well as new ones exploiting iDR5 having been presented. The programme is available at http://www.oact.inaf.it/ges2017/programme.html. We expect that the presentations will also be uploaded to the website soon. Science verification and exploitation by the consortium of the recommended astrophysical parameters and abundances released in the previous internal data releases continues to be active and successful. The list of published and in preparation Gaia-ESO papers is available on the wiki. ADS lists about 120 (about 70 are refereed) publications with Gaia-ESO Survey in the title, for a total of almost 1700 citations. These papers address a wide range of science, covering both the top-level science goals, and many other more specific topics. While the number of papers is certainly good, during the Catania meeting a discussion was held on how to further increase the publication rate, and how to promote Gaia-ESO data exploitation within the consortium, in particular from those CoIs who are not directly involved in the spectroscopic reduction and analysis. We agreed that we should push to complete the production of data release description papers. In the meantime please refer in your papers to the two Messenger articles (Gilmore et al. 2012 and Randich et al. 2013), and to the data release papers that have been published so far. Namely, the UVES pipeline data reduction, WG11, and WG12 analysis, (Sacco et al. 2014, Gaia-ESO paper #13; Smiljanic et al. 2014, Gaia-ESO paper #19; Lanzafame et al. 2014, Gaia-ESO paper #25). In addition, as 4

mentioned, Pancino et al. (2017) summarizes the calibration effort, while Jackson et al. (2015) provides an assessment of the precision of radial and rotational velocities. Finally, Stonkuté et al. (2016, Gaia-ESO paper #53) discuss the Milky Way field selection function.

We are also aware of the fact that those people in the consortium not performing the spectroscopic analyses may not be fully familiar with the Gaia-ESO products and/or the WFAU archive. The members of WG15 at Cambridge (Anna Hourihane and Clare Worley) and Arcetri (Laura Magrini) would be happy to assist you with further information about the products and setting up a WFAU archive account. Please do get in touch with them if you need help, and also make use of the GES Science archive help email account for issues with queries and the archive in general.3

As always, we remind you to follow the Survey project and publication process summarized in Newsletter #4 (available on the wiki and web pages) and the publication policy document posted on the wiki. Please also note the three week internal timescale to provide comments and request authorship. If you have remaining doubts, please contact either the CoPIs or the coordinators of the College of Readers (Janet Drew, Rob Jeffries, Antonella Vallenari). Do please recall that to meet our open-access requirements, all Survey papers should be posted to astro-ph when accepted, and should use the standard acknowledgement (available on the wiki), and the accepted version (not the published one) should be uploaded to the publications page on the wiki (for inclusion in relevant university/institute Open Access databases).

Also please recall that, as for our publication policy, copies of papers, as well as presentations at meetings and colloquia at institutes specifically focusing on the Gaia-ESO Survey are to be provided to us to be uploaded on the Survey wiki and webpage.

To simplify your science planning, here is the list of open clusters with products already in iDR5.

Blanco 1; Berkeley 25; Berkeley 31; Berkeley 36; Berkeley 44; Berkeley 81; Chamaeleon I; IC 2391; IC 2602; IC 4665; M 67; Melotte 71; NGC 2232; NGC 2243; NGC 2264; NGC 2420; NGC 2451; NGC 2516; NGC 2547; NGC 3293; NGC 3532; NGC 4815; NGC 6005; NGC 6067; NGC 6253; NGC 6259; NGC 6530; NGC 6633; NGC 6705; NGC 6802; Pismis 18; Rho Oph; Ruprecht134; Trumpler 14; Trumpler 20; Trumpler 23; gamma Velorum; lambda Ori (B30, B35, C69)

6. Jobs. Open positions for PhD studentships and relevant postdoctoral fellowships are advertised on the wiki home page. These are regularly updated. Feel free to include your own open positions there, and keep looking if you are on the job market.

3 See the Q&A page at ges.roe.ac.uk for the help email account.

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Our best regards to all Gaia-ESO Co-I’s

Gerry Gilmore & Sofia Randich