LSST Directors Review

1
Scientific Areas

• Five areas have been chosen to span the demands
  of multiple scientific investigations
• Wide-field, nearly-static science (Dark Energy)
• Near-Earth Asteroid search (NEA)
• Deep limiting magnitude w/ rapid cadence (Deep
  Drilling)
• All-sky, short-time-dependence search (STD)
• Galactic Plane survey (Galactic Plane)

2
Dark Energy

• Wide-field, nearly-static science
• Science
• Weak Lensing
• Baryon Acoustic Oscillations
• Cluster Counting
• Tidal Streams
• Products
• Stacked photometry, especially for photometric
  redshifts
• Shape determination for cosmic shear measurement
• Astrometry of slowly-moving objects (parallaxes
  proper motions)
• Goals
• Ultimate depth per band
• Average seeing, especially in r and i filters
• Broadly even coverage in time (weeks to months)

3
Galactic

• Galactic Plane Only
• Science
• Stellar populations
• Serendipitous proper motion survey
• L and T dwarf census
• Products
• Stacked images
• Luminosity functions

4
NEA

• Near-Earth Asteroid Search
• Science
• Find rapidly-moving bodies in solar system
• Products
• Sets of orbit arcs spaced closely enough to allow
  unambiguous orbit determinations
• Multicolor lightcurves of asteroids
• Goals
• Completeness as function of size in ten years

5
Deep Drilling

• Limited-area, intensively-sampled survey
• Science
• High-quality (useful) supernova lightcurves
• Rapid time- and color- sampling for transients
• Outer solar system survey for moving objects
• Products
• Five-band, deep (r24.7) lightcurves with 3-5 day
  sampling, average of ten minutes per day
• 15-second sampling for 10-50 minutes at a time in
  multiple colors
• Goals
• Deep 5-day lightcurves for photo-zs from Sne Ia
  to z1.2
• Detection lightcurves for very short
  period/duration transients
• Deep solar system moving-object search

6
STD

• Short-time-dependent science
• Science
• Use RR Lyrae variables to trace galactic
  potential
• Use Cepheid variables for distances to nearby
  galaxies
• Other periodic variable science
• Rapidly-moving object detection
• Products
• Geometric progression of time sampling from 1/2
  hour to 10 days in r bands where amplitude is
  greatest
• Each field receives intensive sampling for one
  epoch in ten-year survey

7
Cadence Simulations

• How we are spending our time
• 80 of total possible observing time in exposing
  slewing
• (i.e. 80 clear fraction)
• 59 of total possible time in exposing
• 12 of exposures in twilight
• (800 hours of slewing per year)

8
30 Cadence Program

• Dark Energy 1760 completed fields, 200 gt 2/3
• Limiting factor was completing the y observations
• Approximately 14,000 square degrees
• Galactic 100 completion
• NEA 1296 completed sequences (361 possible
  fields)
• STD 77/850 completed (too strict criteria)
• Deep Drilling 9 complete (2 missed, 5 terminated
  by end)

9
15 Cadence Program

• Dark Energy 1683 completed fields, 300 gt 2/3
• Galactic 100 completion
• NEA 1012 completed sequences
• STD 100/850 completed (too strict criteria)
• Deep Drilling 9 complete (2 missed, 5 terminated
  by end)

10
Filter Distribution per night through the year
11
Visit distribution for three year run 15