LIM:

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LIM Near IR from a mini-satellite Dani Maoz
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HST WFC3 IR channel 1k x 1k HgCdTe detector, QE
80 18 micron pixels (0.13/pix), 2x2
FOV Detector sensitivity engineered to cut off
above 1.7 micron, so can operate at -128 C
(6-stage thermoelectric cooler) without thermal
noise from telescope and detector. J (1.1 micron)
and H (1.6 microns) bands. Dominant background
zodiacal light 0.6-1.3 e/s/pix Sensitivity
J27 (ABmag, S/N5) in 45 min (point src.), 1.4
hr (1 diam src.) H26.4
53 min
1.5 hr Sensitivity J26 (ABmag, S/N5) in 10
min (point src.), 18min (1 diam. src.)
H25.4 12 min
19min
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HAWK-I on VLT 0.1/pixel, 7.5 FOV 1 hr
exposure J24.9, H23.9 (S/N5) i.e. 100 hrs
exposure needed to reach WFC3 1-orbit
depth! No place like space for NIR!
4k pixels , 7.4cm
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Why not make a mini (HSTWFC3-IR)/10?
2.4m
24cm 9.5 in
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For 24 cm aperture _at_ 1.6 micron, diffraction
limit 1.3. f/10 mirror, 18-micron pixels ?
1.5/ pixel. Need 100 hrs to get to HST-WFC3
depth (same as VLT) BUT FOV can be much bigger!
With 4k x 4k detector (like HAWK-I) FOV1.66x1.66
2.8 degree2 2500 X WFC3 ! A unique instrument
for deep and wide NIR surveying.
Science Surveys for transients in NIR High z
and obscured regions
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• Survey Mode Examples
• All sky (1.3hr exposures) in 2 years,
• to J23.4, H22.5
• Ideal complement to LSST
• 500 deg2 transient search (180 fields,1.3hr
  exposures), every 10 days to J23.4, H22.5.
• 1 year 10,000 SNe Ia, 10,000 CC-SNe
• 3. 30 deg2 (10 fields, 30-hr exposure), every
  13 days
• to J26, H25.4
• 1 year 10,000 SNe Ia, 10,000 CC-SNe, zgt1,
  zgt2

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Type-Ia SN delay time distribution
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Two approved HST MC Treasury programs (1400
orbits) predictions by K. Sharon
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predictions by K. Sharon
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Payload logistics Telescope Weight Off-shelf
Celestron 10 telescope 40kg -- can shave off
with custom lightweight
mirror Camera few kg? To keep it
simple/light/cheap minimum optics, minimum
moving parts, fixed filters on chips
J
J
H
H
Thermoelectric cooler Weight 0 Power
consumption 250 W
H
J
J
H
J
H
J
H
J
H
J
H