Workshop

1

• Workshop
• First look, calibrations, reference sources
• IAP 24 November 2005

• CU6 structure
• Aims of the workshop / open questions

2
CU6 structure

• DU1000 Management of the coordination unit
• DU2000 Database data analysis architecture
• DU3000 Spectra extraction background modelling
• DU4000 Data sanity check quick calibrations
• DU5000 Nominal calibrations
• DU6000 Meta-processing
• DU7000 Single stars radial rotational
  velocities
• DU8000 Multiple stars radial rotational
  velocities
• DU9000 Stability/variability assessment
• CU6 spectroscopic processing development plan
• (Version 1 December 2005)

3
Example of WBS DU6000 Meta-processing

• WP6100 Management of DU6000.
• WP6200 Apply calibrations.
• WP6300 Clean spectrum. (or in background
  modelling)
• WP6310 Filter defective pixels.
• WP6320 Filter optical defects (ghosts, ).
• WP6320 Filter cosmic rays.
• WP6400 Normalize to continuum.
• WP6500 Combine observations.
• WP6510 Examine/use astrometric and photometric
  information.
• WP6520 Examine/use evolution of spectral
  morphology.
• WP6530 Examine/use radial and rotational
  velocities information.
• WP6540 Use available information and optimally
  combine spectra.
• WP6600 Spectra transforms
• WP6610 Fourier transforms.
• WP6620 Wavelet transforms.
• WP6700 Filter noise
• WP6710 Overview of existing techniques.
• WP6720 Filter noise in Fourier space.
• WP6730 Filter noise in wavelet space.

4
Example of WBS DU7000 Single star radial
rotational velocities

• WP7100 Management of DU7000.
• WP7200 Auxiliary data general.
• WP7210 Define summarize needs and build test
  data set.
• WP7220 Define and summarize needs for template
  spectra.
• WP7230 Manufacture masks.
• WP7240 Define/build library of rotational
  velocity standard
• WP7250 Implement auxiliary data access methods.
• WP7300 Auxiliary data radial velocity standard.
• WP7310 Define list of potential calibration
  stars.
• WP7315 Observe potential calibration stars.
• WP7320 Derive RV of potential calibration stars.
• WP7325 Identify stable stars.
• WP7330 Assess RV shift due to instrum./wavel.
  range/techniques.
• WP7360 Define list of potential calibration
  asteroids
• WP7365 Simulate the observation of potential
  calibration asteroids
• WP7370 Assess consistency asteroid/star for RV
  zero point.
• WP7375 Observe asteroids.
• WP7380 Assess performance with observed
  asteroids.
• WP7400 Radial velocity derivation methods
  (including error assess.).

5
Aims of the workshop

• Discuss the 3 related issues of First look,
  calibrations and reference sources
• ? direct discussion/brainstorm questions,
  present different approaches different points
  of view
• Address / answer some specific question
• Try to define an high-level overall approach for
  first look / calibration i.e. baseline scenario
  (that will be iterated/modified).
• Define methodology to refine WBS

6
First look

• Tasks of first look?
• Check good health of the instrument?
• Check good health of the spectra? Which spectra?
  How many spectra?
• Perform quick calibrations? Use the nominal
  calibration algorithms with different input data?
• Check scientific performance?
• ...?
• Frequency? Daily basis? Monthly basis (weakest
  spectra)?
• Methods?
• Auxiliary data? Dedicated observing program(s)?

V Types Nph /samp G2V Nph /samp (/spe) K1III Nspectra / day
18 All 0.7 1 (3 300) 12.5 106
15 All 10 15 (52 000) 1.2 106
14 All 25 45 (130 000) 500 000
13 All 70 110 250 000
12 All 175 285 100 000
12 F-G-K 175 285 75 000
12 F-G-K No-crowd 175 285 37 500
10 F8-G-K - stable 1125 1795 2 500
7
Nominal calibrations

• Which instrumental quantities should be
  calibrated? How?
• How frequently should the nominal calibrations be
  performed? weekly? monthly? Why? Is there a gain
  in continuity over several days/weeks? Are there
  long-term effects to calibrate (e.g. over one
  precession period? e.g. over one year?)?
• Volume/type of calibration data?
• Auxiliary data? Dedicated observing program(s)?
• Is the global iterative approach appropriate
  for all calibrations?

8
Reference sources

• Type of standards? Qualified before/during the
  mission, by us/by others.
• How to identify standards? How to qualify
  standards? How to achieve absolute RV at the 300
  m/s level? Are some software developments
  required?
• How many standard will we qualify? How many will
  others qualify?
• How to test the performance of RV standard for
  SGIS?

9
Agenda

• 1000 1040 Introduction
• 1040 1130 Overview of first look
• 1130 1220 Overview of the calibrations
• 1220 1300 An example wavelength calibration
• 1300 1410 Lunch
• 1410 1500 Radial velocity reference sources
• 1500 1630 Synthesis discussions