NEAT 2013 Simulation Workshop

May 27-28 May  2013

Vercors Room,
Institut de Planétologie et d'Astrophysique de Grenoble

Grenoble, France

Preliminary announcement

Science Rationale
  Workshop Program
List of Participants
Practical information


The NEAT (Nearby Earth Astrometric Telescope) mission is a proposition for a M-size mission within the Cosmic Vision 2015-2025 plan. The main scientific goal of the NEAT mission is to detect and characterize planetary systems in an exhaustive way down to 1 Earth mass in the habitable zone and further away, around nearby stars for F, G, and K spectral types. This survey would provide the actual planetary masses, the full characterization of the orbits including their inclination, for all the components of the planetary system down to that mass limit. The main science drivers are identification of Terrestrial planets in the habitable zone of nearby solar-type stars, constraints for planetary formation scenario, interaction of planets in planetary systems, exploration of a new part of the parameter space to understand the diversity of exoplanets.

As discussed during the NEAT workshop in Nov 2011, it is time to start "data simulator" activities for NEAT. The idea is to merge different software tools to build a pipeline that will be able to transform any given planetary systems in realistic NEAT signals including different sources of noises. Once the pipeline will be ready, we will generate random planetary systems, transform them to astrometric signals and see if the NEAT data processing teams are able to retrieve the characteristics of the systems with adequate accuracy.

The idea is to gather the competences of different groups:
1- planetary population synthesis
2- planetary dynamics to generate ephemeris
3- generation of stellar noises
4- attribute each system to an actual star with reference stars
5- Define a baseline astrometric and Doppler model
6- Generate photometry, radial velocities and differential astrometry
7- Simulate realistic Doppler measurements and cadence
8- Simulate Gaia observations (~50uas/epoch x 80 epochs)
9- Simulate 50 measures of 0.8uas/sqrt(h) NEAT signals and add realistic instrumental noise
10-Data processing code to retrieve the parameters of the planetary systems
The 2013 NEAT workshop is aimed at gathering experts from the different fields to build the NEAT simulator and run a double blind test with hidden initial values to be retrieved.

The result of this work will provide the mandatory design requirements and demonstrate the capabilities of high precision astrometry mission coupled with RV and Gaia to find all planetary components down to the Earth mass around our close neighbours.

Organizers: Fabien Malbet, Alain Léger and Guillem Anglada-Escudé

Workshop Program

Monday 27 May

10:30 Session 1: NEAT in context
            10:30 NEAT mission and observables – F. Malbet (Grenoble)
            11:00 NEAT Science objectives – A. Léger (Orsay)
            11:30 Possible data stream for NEAT simulations – G. Anglada-Escudé (Goettingen)
            12:00 Gaia simulations – X. Luri (Barcelona)
            12:30 Discussion
13:00 lunch - buffet
14:00 Session 2: planetary populations and dynamical models
            14:00 Simulations of planetary populations – Y. Alibert (Bern)
            14:20 Orbit stability and ephemeris – H. Beust (Grenoble)
            14:40 Discussion
15:00 Session 3: star properties
            15:00 Stellar properties, references, habitable zone – A. Crouzier (Grenoble)
            15:20 Stellar noise – S. Borgnier (Grenoble)
            15:40 Discussion
16:00 Pause
16:30 Session 4: observables
            16:30 What to expect from Radial velocities – T. Forveille (Grenoble)
            16:45 What to expect from Gaia – A. Sozzetti (Torino)
            17:00 What to expect from Photometry survey (TESS - G. Ricker's presentation) - C. Beichman (Pasadena)
            17:15 Discussion
17:30 Session 5: Experience from SIM-Lite and Kepler (by teleconf with JPL)
            17:30 Experience from Double Blind Test – W. Traub (Pasadena)
            17:50 Planetary systems observed by Kepler (no slides) – C. Beichman (Pasadena)
            18:10 Post-processing of SIM-Lite DBT– M. Shao (Pasadena)
            18:30 Discussion

20:00 Dinner

Tuesday 28 May

09:00 Session: Data processing
            09:00 Gaia data processing – A. Sozzetti (Torino)
            09:30 Combined astrometry and Doppler analysis – D. Ségransan (Geneva)
            10:00 Denoising PSF for astrometry – A. Moitinho de Almeida and A. Krone-Martins(Lisbon by telecon)
            10:30 Discussion
13:00 Coffee break – buffet
10:30 Session: what should be done in addition
13:00 lunch – buffet
14:00-16:00 Plans for the NEAT simulations
            Actions on Roadmap, schedule, who is doing what
16:30 End of workshop


There is no fee registration. If you are interested to participate, please contact Fabien Malbet and/or the workshop secretary Laurence Platel.


  1. Alibert, Yann (Bern)
  2. Anglada-Escudé, Guillem (Goettingen)
  3. Arenou, Frédéric (Meudon)
  4. Beichman, Chas (Pasadena by telecon)
  5. Beust, Hervé (Grenoble)
  6. Borgniet, Simon (Grenoble)
  7. Chelli, Alain (Grenoble)
  8. Crouzier, Antoine (Grenoble)
  9. Dupont, Jan (Grenoble)
  10. Duvert, Gilles (Grenoble)
  11. Forveille, Thierry (Grenoble)
  12. Krone-Martins, Alberto (Lisbon by telecon)
  13. Lagrange, Anne-Marie (Grenoble)
  14. Le Duigou, Jean-Michel (Toulouse)
  15. Léger, Alain (Orsay)
  16. Luri, Xavier (Barcelona)
  17. Malbet, Fabien (Grenoble)
  18. Meunier, Nadège (Grenoble)
  19. Moitinho de Almeida, André (Lisbon by telecon)
  20. Quirrenbach, Andreas (Heidelberg)
  21. Ségransan, Damien (Geneva)
  22. Shao, Mike (Pasadena by telecon)
  23. Sozzetti, Alessandro (Torino)
  24. Traub, Wes (Pasadena by telecon)
  25. Voss, Holger (Barcelona)

Practical information

The PDF document gives the indications how to reach IPAG (Grenoble) and provides a list of recommended hotels.



The workshop is sponsored by IPAG (Institut de Planétologie et d'Astrophysique de Grenoble) and by CNES (French space agency).