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Upgrade plan of the MOA 1.8-m telescope

Upgrade plan of the MOA 1.8-m telescope. F. Abe MOA collaboration. 19 Jan. 2009, 13th Microlensing Workshop @ Paris. Discovery of Neptune. In 1846, a mathematician of Observatoire de Paris , Le Verrier predicted a new planet Independent prediction was made by Adams, UK

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Upgrade plan of the MOA 1.8-m telescope

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  1. Upgrade plan of the MOA 1.8-m telescope F. Abe MOA collaboration 19 Jan. 2009, 13th Microlensing Workshop @ Paris

  2. Discovery of Neptune • In 1846, a mathematician of Observatoire de Paris, Le Verrier predicted a new planet • Independent prediction was made by Adams, UK • Then, Neptune was discovered by Galle at Berliner Sternwarte as per their predictions Urbain Jean Joseph Le Verrier Predictions were essential John Couch Adams

  3. Discovery of OGLE 2005-BLG-390Lb Unpredictable Beauliu, et al., 2006

  4. Discovery of MOA 2007-BLG-192Lb Single lens light curve MOA high-cadence observations OGLE observations Bennett, et al., 2007

  5. Real timedetection of anomalyOGLE 2007-BLG-368/MOA 2007-BLG-308 Sumi, et al., this WS

  6. Short timescale events(MOA 2006-BLG-98) tE ~ 1day Caused by very low-mass star(?): Free-floating planets (?) Brown dwarfs (?) Kamiya, et al., this WS

  7. Current MOA telescope & CCD Camera • Installed at Mt. John, Observatory, NZ in 2004 • Aperture: 1.8 m • FOV: 2.18 degree^2 • Seeing > 1.5” • 1 observation/hour 4 corrector lenses 2 degree image circle Plan of upgrade to get wider FOV Sako et al., 2008

  8. Optical design (by A. Rakich): Requirements & compromise • Requirements • FOV: as wide as possible • Primary mirror: use present mirror • No aspheric lens • No special low-dispersion glasses • Compromise • Replace corrector lenses • Throw out short wavelength (U, B) • Circular effective area

  9. New corrector lenses (4 degree) All spherical surfaces 3-4 layer coating FQ f/2.96 4 deg ~ 12 deg^2 BK7 BK7 BK7 BK7 BK7 Vessel Window f/2.91 2 deg. By A. Rakich

  10. Spot diagram (I) 30μm ~ 1.16” 4degree Image circle ~12deg^2

  11. Spot diagram (V) Target FOV: ~ 10 deg^2

  12. Possible CCD layout Image circle 4 degree in diameter CCD chip 3cm x 6cm 0.33°x 0.66° Total: 52 chips 11.3 deg^2 5-6 observations/hour Factor 5 improvement Honeycomb scan

  13. Honeycomb survey (example) 1 2 3 Seamless survey can be made without overlap 6 5 4 7 8 9

  14. Current CCDs E2V CCD4882 2k X 4k, 3cm x 6cm Back illuminated QE: > 90% (500nm), ~30% (900nm) Astronomical Research Camera Gen III Hamamatsu CCDs S10892-01 2k X 4k, 3cm X 6cm Back illuminated,full depletion (developed by LBNL) QE: ~90% (600-850nm) >80% (900nm) Factor 2 improvement Astronomical Research Camera Gen III CCD chips & Electronics for SUBARU HSC

  15. Time schedule Apr 1 July Oct 30 Installation R&D, cost estimate Proposal Polish assemble Blanks Lenses Assemble Tests CCDs etc. High quality alert: ~ 2013 Camera Tests Science Observations 2010 2012 2009 2011

  16. Summary • High-cadence observations using wide FOV are essential in new generation microlensing planet search • MOA Group is planning to upgrade existing 1.8-m telescope to get ~ 10 deg^2 FOV • Design of the new optics has been done. • Technical studies of the CCD camera are going to start to solve several problems • After several technical studies and cost estimate, we will submit the first proposal in this October. • If it’s approved, observation will be started in the 2012 bulge season

  17. Merci de votre attention

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