TPFC: Size and Completeness

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TPF-C Size and Completeness

• Sarah Hunyadi
• Contributors
• Stuart Shaklan
• Bob Brown
• 28 - 29 September 2006

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Program Completeness
Compute completeness based on observable planets
that have not yet been observed
Determine if star is available for observation
Generate orrery of planets
Start
repeat up to 3 years
next week
Parameters for 10,000 pseudo planets
Determine stellar visits and observation time
based on efficiency threshold optimization
Eliminate planets that are observed with visit
eccentricity
phase
inclination
End
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Optimization

• Optimization removes least efficient integration
  time for a given star so that we may observe
  other stars in the program.

Comp

• We optimize by varying the Efficiency Threshold
  Cutoff (ETC) and keeping the set of stars with
  the largest Total Accumulated Completeness in a
  given optimization period.

time

• We perform this optimization for the stars that
  are available every three weeks over a three year
  period.

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TPF-C Baseline Parameters
Corresponds to 4?/D with an IWA increase due to
the elliptical PSF
Includes 3 rolls and 3 dithers
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Size and n?/D Changes
FB-1
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Circular Elliptical

• The major difference between circular and
  elliptical apertures is that we need 3 rolls
  positions, each with a dither, for the elliptical
  aperture and only 1 roll position and 1 dither
  for the circular aperture.

Dither
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PIAA and Vortex Assumptions
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Results

• PIAA Completeness Targets
• 2 ?/D 70.14 140
• 2.5 ?/D 50.59 104
• 3 ?/D 35.25 75
• 3.5 ?/D 25.02 56
• 4 ?/D 17.34 33
• Vortex Completeness Targets
• 2 ?/D 65.73 133
• 2.5 ?/D 48.01 99
• 3 ?/D 34.12 71
• 3.5 ?/D 24.46 54
• 4 ?/D 17.33 33

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NWO Assumptions (Single Occulter)
Varied parameters -Starting latitude -Starting
longitude -Overhead
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Results
Maximum TAC
Some stars are visited twice. No stars are
visited 3 or more times.
movie
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Questions ??
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Back-up Slides
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NWO Sequence
Swath sweeps out in a fan of observability
between 45 and 95 degrees
Region of permissible observability
50 degrees
NWO
Earth
Top View
Last star observed