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Mercury’s Sodium Exosphere from Maui AEOS & Tohoku Observatory June 2006

Mercury’s Sodium Exosphere from Maui AEOS & Tohoku Observatory June 2006. AEOS Telescope + Image-Slicer/ Spectrograph. Data Reduction and Results for June 8, 2006. IMAGE SLICER DETAIL. ARROWS POINT TO FIRST COLUMN. FIRST ROW. SECOND ROW. THIRD ROW. FORTH ROW. COLUMN #1, ROW #1.

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Mercury’s Sodium Exosphere from Maui AEOS & Tohoku Observatory June 2006

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  1. Mercury’s Sodium Exospherefrom MauiAEOS & Tohoku ObservatoryJune 2006

  2. AEOS Telescope +Image-Slicer/ Spectrograph Data Reduction and Results for June 8, 2006

  3. IMAGE SLICER DETAIL ARROWS POINT TO FIRST COLUMN FIRSTROW SECOND ROW THIRD ROW FORTH ROW COLUMN #1, ROW #1 COLUMN #1, ROW #1 2.4 mm 2.8 mm

  4. AEOS + Image-Slicer Spectrograph: Observing parameters • 3.7-meter telescope with adaptive optics • Scale: 0.5 arc-seconds per fiber • 1-minute exposures • Twilight not significant • Calibrated with standard stars • June 8: 10 data cubes • June 9: 8 data cubes

  5. AEOS + Image-Slicer Spectrograph: Raw Data Mercury Flat Field Sodium Lamp

  6. AEOS + Image-Slicer Spectrograph: Image Reconstruction Method • Spectrally un-warp the images • Choose wavelength (row) • Fiber brightness = sum of 5 pixels

  7. AEOS + Image-Slicer Spectrograph: Remove Spectral Curvature Mercury Flat Field

  8. AEOS + Image-Slicer Spectrograph: Locate Each Fiber at Each Wavelength

  9. AEOS Reconstructed Images Mercury reconstructed Final Image (continuum) Each raw image yields a data cube of 1024 images Flat field reconstructed

  10. AEOS + Image-Slicer Spectrograph: Subtraction of surface-reflected solar spec. • Ganymede spectrum = solar spectrum without Na emission • (Ganymede spectrum) x (Merc. Image) = artificial data cube of Mercury w/o Na • Subtract artificial data cube from real data cube to yield Na emission

  11. Mercury at D1+D2 Merc. x Gany. at D1+D2 - = Na Exosphere

  12. AEOS June 8, 2006(VR=10.0 km/s away)

  13. Tohoku Observatory +Image-Slicer/ Spectrograph Data Reduction and Results for June 15, 2006

  14. Tohoku Observatory, Maui + Image-Slicer/Spectrograph: Observing parameters • 16-inch Meade • Same image-slicer/spectrograph • 3 arc-seconds per fiber • 2-minute exposures • Dates: • June 14: 5 data cubes • June 15: 5 data cubes • June 17: 9 data cubes • June 18: 8 data cubes

  15. Tohoku U. @ Maui June 15, 2006(VR=8.6 km/s away)

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