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A STEP Antarctica Search for Transiting Extrasolar Planets

A STEP Antarctica Search for Transiting Extrasolar Planets. Technical design and work packages. Telescope choice. IRAIT Telescope Nasmyth focus adaptation Excluded because of late problems of IRAIT Lots of dedicated systems for optical photometry would have been required. Telescope choice.

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A STEP Antarctica Search for Transiting Extrasolar Planets

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  1. A STEP Antarctica Search for Transiting Extrasolar Planets Technical design and work packages

  2. Telescope choice • IRAIT Telescope • Nasmyth focus adaptation • Excluded because of late problems of IRAIT • Lots of dedicated systems for optical photometry would have been required

  3. Telescope choice • Meade 16 telescope tube • Excluded because of problems of antarctisation of that telescope • No real advantage on Newton telescope

  4. Telescope choice • Minitrust optical design • Optical combination with 3 mirors for wide field photometry with active optics – no astigmatism and achromatic • Excluded because of problems with focal plane installation, necessity of redesigning for Antarctica, size of the central obstruction and weight (45 cm nominal design)

  5. Telescope choice • Newton telescope vs Rictchey Chretien • Similar behaviours for fiels around 1 °, but increased sensibility of RC to telescope tube dilatations • Important PSF shape changes with differential dilatations • RC combination not optimal for slightly defocused telescopes

  6. Telescope choice Newton 30 cm or 40 cm According to telescope mount possible payload Specific prototype built with Optique & Vision and ERI Telescope tube built with an INVAR structure and carbon fiber cover CCD DW 436 (Andor) Size 2048 x 2048 Pixel size 13.5 mm 1.74 arcsec on sky

  7. Newton 40 cm nominal configuration A STEP Characteristics: Camera use: Defocused PSF PSF sampling: FWHM covering ~4 pixel Time exposure: 10s Readout time: 10s Telescope mount: German Equatorial Astrophysics 1200 With controlled heating Pointing precision tolerated ~.5” Data storage: ~500 GB /campaign Data retrieval at the beginning of Antarctic Summer for first campaigns CCD DW 436 (Andor) Size 2048 x 2048 Pixel size 13.5 mm 1.74 arcsec on sky

  8. A STEP camera • CoRoT backup available CCDs • Excluded because of work to adapt and build CCDs environment for A STEP • Andor DW436 • See Alain presentation • 2048x2048 pixel • Backwards illuminated CCD • Limited intra-pixel fluctuations (Karoff 2001) • Excellent quantum efficiency in red • -USB2 with antarctisable connection • -Performances guaranted by constructor

  9. Telescope mount Astrophysics 1200 or New Astrophysics prototype if available on time See Karim presentation

  10. Newton optical combination Telescope tube: INVAR structure With Carbon fiber cover 4Mpixel DW436 CCD Wynne Corrector Thermal enclosure for focal instrumentation

  11. Work packages and early schedule • WP1 - Mechanical design • 6 JB Daban • -F Fressin • -F Valbousquet • -K Agabi • -OCA groupe projet • -LUAN groupe projet • Design of telescope tube structure, telescope to mount fixation • Early discussion on design with groupe projet (Sep ? Oct ?): Karim, JB, Franck: list of needed specifications – Heike Anders, Frederic tolerance on changes on PSF shapes for image substraction • Choice of the telescope size to be done according to telescope mount at the end of October and realisation

  12. Work packages and early schedule • WP2 - Telescope and Camera software • -A Klotz • -A Blazit • -C Combier • -K Agabi – organizing discussion • -A le Van Suu • -C Carol • Study of telescope guiding and tracking software and camera reading. Computer interfaces/redundancy/security • Meeting between LUAN and OHP teams soon (Sep ? Oct ?) to fix which software can be reused/adapted for A STEP

  13. Work packages and early schedule • WP-3 Camera thermal enclosure design and tests/ filter and field corrections – > subcategory of WP-1 • -A Blazit • -JB Daban • -F Jeanneaux • -Y Fantei • -F Fressin • -K Agabi • Design of enclosure for camera / wynne corrector /filter or dichroïc, fixation on telesope tube

  14. Work packages and early schedule • WP-4 Optical combination – Camera tests • A Blazit V • P Assus • F Fressin • A Erikson + F Pont in reaction mode – F Valbousquet real input • Zeemax simulations of the field – PSF shapes on every part of the field.

  15. Work packages and early schedule • WP-5 - 2007 campaign tests • -D Mekarnia V • -FX Schmider • -E Fossat • K Agabi + F Valbousquet V + V : optical experiments – small mirrors including tulip mirror in zerodur September • Logistic needs for A STEP : to be defined for September 11 • Checking the availability of new “optical experiments” site at Dome C, or preparing A STEP for Concordiastro site • Testing specific treatment on zerodur mirror at different places – behaviour of frost - optical behaviour of mirrors Foucault test • What do we send at Dome C in 2 months ? • Additional tests on Astro 1200 ? Different payloads ?

  16. Work packages and early schedule • WP-6 Dome C specific problems: open questions that require study groups • - Karim V • How to do flat fields at Dome C ? Mandatory for good photometric precision – frequency needed ? • Necessity of a protection for bad condition days/summer ? Availability of “flower domes” ? • Electrical problems/overcharges – all electronic control • Duplication ? Of camera ? Encoder (mount) Control computer • Who will run A STEP in 2007 ?

  17. Work packages and early schedule • WP–7 Data pipeline – Light curves extraction and analysis • -H Rauer V • -A Erikson • -F Pont • -T Guillot • -FX Scmider • -F Fressin • What is reused from BEST data pipeline ? Design of the alarm mode and photometric control. What has to be fixed before A STEP departure for Dome C? • Need to drive A STEP on sky in France before computing the real pipeline – define specific alarm mode too – • Proposal: input from Heike – development as a team approach – raise fundings – archiving A STEP data – Proposal fro A STEP/BEST 2 comparisons/summer/winter network - internal DLR funding application by spring 2007

  18. Work packages and early schedule • WP-8 Target fields selection – survey strategy • -T Guillot • -FX Schmider • -F Pont • -H Rauer • -C Moutou • -M Deleuil • -S Aigrain • -F Fressin • Need for preliminary observations – or data base on target fields ? Specific needs for seismology targets ? • Target field selection from Holger thesis • Starting discussion with Marseille field selectors for CoRoT

  19. Work packages and early schedule • WP-9 Data analysis – Follow up of candidates • -T Guillot • -FX Schmider • -F Pont • -H Rauer • -A Erikson • -F Bouchy • -F Fressin • -S Aigrain • -C Moutou • What is necessary to fix soon ?

  20. Work packages and early schedule • WP-10 Future prospects – the best design for global transit search • -T Guillot • -H Rauer • -Y Fantei : internet site soon • -A Erikson • -F Pont • -FX Scmider • -F Fressin • comparative simulations with CoRoTlux – experience from BEST-2 – A STEP connection and CoRoT preliminary results • Necessity to propose different designs soon for visibility and outreach ? • Developping webpage / internal and public ? Yan Fantei

  21. THE A STEP TEAM

  22. Schedule of A STEP

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