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White Dwarfs in the HET Dark Energy Experiment

17 th European White Dwarf Workshop – Tübingen , August 16-20, 2010 . White Dwarfs in the HET Dark Energy Experiment. Bárbara G. Castanheira. The University of Texas at Austin Universität Wien. 17 th European White Dwarf Workshop – Tübingen , August 16-20, 2010 .

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White Dwarfs in the HET Dark Energy Experiment

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  1. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 White Dwarfs in the HET Dark Energy Experiment Bárbara G. Castanheira The University of Texas at Austin Universität Wien

  2. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Hobby-Eberly Telescope Location: McDonald Observatory (30° 40' N) Low cost: 15-20% of the cost of a 9 m telescope Primary mirror: 11.1 x 9.8 m (9.2 m effective aperture) 91 hexagonal mirrors Fixed elevation angle of 55o (tilted Arecibo design) Access 81% of the sky Queue schedule Instruments: HRS, LRS, MRS Model for SALT

  3. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 HETDEX: HET Dark Energy Experiment Goal: probe dark energy Observations: ~1400 hours in 3 years Technique: expansion of the universe at 0<z<4 Main targets: Lyman-α emitting galaxies (Hill et al. 2008)

  4. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dark energy: Supernovae discovery of accelerated expansion Within GR: smooth energy with large negative pressure 75% of the universe Acceleration began at z~0.4 and t~10Gyr

  5. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 (Frieman et al. 2008)

  6. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Destiny of the universe depends critically upon the nature of dark energy!

  7. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 HETDEX field:

  8. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 VIRUS-P Review: • Visual Integral-field Replicable Unit Spectrograph - Prototype • 1.9’x1.9’ FOV at 2.7 m HJST • 1/3 fill factor • Largest FOV of any existing IFU • 4.2’’ diameter fibers on sky • 3500-5800Å wavelength range • R=1000 @ 5000Å

  9. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Flux calibrating the pilot survey: Feige 34

  10. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dither 1:

  11. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dither 2:

  12. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dither 3:

  13. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dither 4:

  14. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dither 5:

  15. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Dither 6:

  16. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Feige 34: VIRUS-P 2.7m HJST 6x120s V=11.2

  17. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 HETDEX details: 150 VIRUS 3500-5500Å ~3400 spectra FOV 22arcmin Resolution ~5Å ~140 nights, 3 years PARALLEL SURVEY

  18. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 (Drory 2010)

  19. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 White Dwarfs in HETDEX • ~20000 White Dwarfs • Magnitude limited sample • For V=22, S/N=3 • Main and Parallel surveys A powerful survey!

  20. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 HETDEX current status: • Schedule: late 2011 • VIRUS-P at HET • Replication of spectrographs • Software (CURE or VACCINE & DIAGNOSE) • Additional science

  21. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 White dwarf science goals: • WD Luminosity Function • New candidates of pulsators(2.1m) • New “flavors” of WDs?

  22. 17th European White Dwarf Workshop – Tübingen, August 16-20, 2010 Danke! Obrigada! barbara@astro.as.utexas.edu

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