stis status update - stsci · stis status update john h. debes . space telescope science institute...
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SPACE TELESCOPESCIENCE INSTITUTE
SPACE TELESCOPESCIENCE INSTITUTE
SPACE TELESCOPESCIENCE INSTITUTE
Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
STIS Status Update
John H. Debes
SPACE TELESCOPESCIENCE INSTITUTE
SPACE TELESCOPESCIENCE INSTITUTE
SPACE TELESCOPESCIENCE INSTITUTE
Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
STIS in the News
5/11/16 STUC – STIS
AU Mic—STIS Coronagraphy
STIS FUV Spectroscopy
Ganymede—STIS FUV Imaging
SPACE TELESCOPESCIENCE INSTITUTE
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SPACE TELESCOPESCIENCE INSTITUTE
Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
5/11/16 STUC – STIS
Introducing the STIS Team
John Debes Lead
Charles ProffiC Deputy Molly Peeples Allyssa Riley Nolan Walborn
Sean Lockwood Tala Monroe
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Cycle 23 CCD Calibration Program
5/11/16 STUC – STIS
Prop. ID Title External External Parallel Internal
STIS CCD Performance Monitor 14
STIS CCD Dark Monitor 732
STIS CCD Bias and Read Noise Monitor 370
STIS CCD Hot Pixel Annealing 39*
STIS CCD Spectroscopic Flat-Field Monitor 19
STIS CCD Imaging Flat-Field Monitor 4
STIS CCD Spectroscopic Dispersion Solution Monitor 3
STIS CCD Sparse Field CTE 50
STIS CCD Full Field Sensitivity 1 16
STIS Slit Wheel Repeatability 1
STIS CCD Spectroscopic Sensitivity Monitor 5
STIS CCD Amp A, C, & D Gains 6
STIS Focus + Parallel Measurements 1 1
STIS CCD Pushing Limits of BAR5 9
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Prop. ID Title External External Parallel Internal
STIS MAMA Spectroscopic Dispersion Solution Monitor 7
STIS MAMA Full Field Sensitivity 3
STIS MAMA Spectroscopic Sensitivity and Focus Monitor / COS Observations of Geocoronal Lyα Emission 12
STIS FUV MAMA Dark Monitor 54
STIS NUV MAMA Dark Monitor 52
STIS MAMA NUV Flat-Field Monitor 11*
STIS MAMA Fold Distribution 2
Contingency program
STIS MAMA Anomalous Recovery (6)
5
Cycle 23 MAMA Calibration Program
Total Cycle 23 Alloca.on: 31 External, 1 External Parallel, 1380 Internal, 6 con.ngency
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Instrument Status
Detector Dark Rate Read NoiseCCD
GAIN=1 0.019 e-/s/pixel 6.2 e-/pixel
GAIN=4 0.019 e-/s/pixel 8.1 e-/pixel
NUV-MAMA 1.5x10-3 cts/s/pix --
FUV-MAMA 1.5x10-4 cts/s/pix --
• No major changes to the instrument • Detector properties steady or trends unchanged • Time Dependent Sensitivity (TDS) trends continue
5/11/16 STUC – STIS
1425 2376 4300 7751−1.0
−0.5
0.0
0.5
STIS TDS Slope L Modes
1425 2376 4300 7751CENWAVE
−1.0
−0.5
0.0
0.5
TDS
Slop
e (%
/yr)
MAMA
CCD
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
STIS Coronagraphy-Pushing the Limits
• Open up new coronagraphic modes/techniques to be competitive with current ground-based coronagraphs
• By pushing to the photon limit of STIS’s coronagraphic PSF, we can achieve 10-6 contrast or better for a reasonable number of orbits
• Unique qualities of STIS compared to the ground: – Access to northern targets – No magnitude limits to contrast – Total intensity visible light
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
BAR5-0.2” Inner Working Angle
5/11/16 STUC – STIS
12923 (PI: Gaspar, outsourced calibraQon)
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Program 14426 Observing Setup
• Special Calibration Program 14426 (Cycle 23) • 9 external orbits on HD 38393
– 3 blocks of 3 contiguous 1-orbit visits – Each visit with a different spacecraft orientation—apply Azimuthal
Differential Imaging (ADI) – Within each visit, 3x3 dither pattern behind BAR5 – 1024x90 pixel subarray to minimize buffer dumps
• Dither Pattern to mitigate miscenterings/non-repeatabilities • Dither pattern+orientation changes optimized for post-
processing (i.e. KLIP, LOCI) • Creates reference library for solar type stars (currently
missing in GO programs) • Website/STAN published March 8, 2016 – in time for Cycle
24 • ISR in progress • BAR5 supported mode in APT for Cycle 24
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Sub-Pixel Grid Dithers
5/11/16 STUC – STIS
−1.0 −0.5 0.0 0.5 1.0−1.0
−0.5
0.0
0.5
1.0
−1.0 −0.5 0.0 0.5 1.0Delta X (Pixels)
−1.0
−0.5
0.0
0.5
1.0
Del
ta Y
(Pix
els)
Visit 3Visit 2Visit 1
• Opera.onal test with relevance to JWST coronagraphic opera.ons
• On orbit measurements of stellar centroids verify dithers work with expected magnitude
• Dithers are repeatable to within ~0.1 pixels
• Ini.al work shows that dithering along the y-‐direc.on provides factor of 2 improvement in contrast
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
BAR5-10-6 Contrast or Better
5/11/16 STUC – STIS
GPI (NIR)
• Comparable contrast performance to GPI
• Visible light less sensi.ve to planets
• More sensi.ve to dust/stellar companions
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Other Work Currently in Progress
• Lifetime extension work – Started review of mechanism lifetime – No obvious issues identified with preliminary review – Draft report to determine pointing requirements in case of
single FGS operations – Investigation of Calibration Lamp dimming—ISR in
progress • Updating NUV, FUV time dependent sensitivity trends in
reference files • Monitoring of STIS focus—ISR in progress • Continued investigation into Echelle Blaze Function shifts • New Gain measurements for CCD Amps A, C, and D (no
significant changes)—ISR in progress
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Future Vision for STIS
• STIS is entering Year 20 • It’s time to be aggressive in identifying new modes/
methods in areas where STIS is unique before it goes away
• The STUC and the broader community partnering with our team is key through: – Increased advertisement of outsourced calibration
programs – Increased communication with core STIS science
communities • The time is now!
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Back-up slides
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Estimated Performance vs. AO
5/11/16 STUC – STIS
V=6.7
V=1.1
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Team Organization
5/11/16 STUC – STIS
Lead Deputy
Calibra.on Monroe Peeples
Front End Lockwood ProffiY
Pipeline ProffiY
User Support Walborn Peeples
ETC Peeples Lockwood
CCDs Lockwood
MAMAs Peeples
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
HD 38393
• F6V, Teff=6350 K, d=8.9 pc • Good visibility and guide stars throughout the Cycle • Large nominal HST roll angle evolution from Sept.-
Feb. • Target for Mid-IR interferometry and Herschel
photometryàNo known dusty disks • No known exoplanet companions • Probable future target for direct imaging of
exoplanets in reflected light
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
SPHERE/ZIMPOL
Roelfsema et al., 2014 5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
STIS Coronagraphy
5/11/16 STUC – STIS
0.0 0.5 1.0 1.5 2.010−8
10−7
10−6
10−5
10−4
10−3
10−2
0.0 0.5 1.0 1.5 2.0R (arcsec)
10−8
10−7
10−6
10−5
10−4
10−3
10−2
Poin
t Sou
rce
Con
trast
Raw Contrast
Photon Limited Contrast
S/N=5
VisAO
SPHERE/ZIMPOL
(STIS)
(STIS)
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
VisAO
Males et al., 2014
Beta Pic b @Y band Contrast=10-‐5 @ 0.4”
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Centroiding
5/11/16 STUC – STIS
a) b)
d)c)
−7
−6
−5
−4
log 1
0 [C
ontra
st]
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Adding BAR5 to APT
• BAR5 now supported in Cycle 24 APT • Used one orbit of 14426 to verify updates to SIAF files/APT updates • Visit A9 executed nominally on Feb. 22 • A9 indistinguishable from Visits 7 and 8 of the program taken just
before • Sub-pixel grid dither step size appears to have slight non-
repeatabilities
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
STIS Calibration Lamps (II)
5/11/16 STUC – STIS
LINE lamp only: 2011 2012 2013 2014 2015
HITM2 G140M, 1173, 52x0.1
• Special Calibra.on Program 14489 • Determine default WAVECAL exposure
.mes for E140H/1234, E140H/1271 • Program executed 3/30/16 • HITM2 has dimmed by 14% since 2010 • Change in lamp with exis.ng exposure
.mes for these modes retains ~0.5 pixel zeropoint accuracy
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Centroiding shows that Visit A9 executed as expected
-1.0 -0.5 0.0 0.5 1.0-1.0
-0.5
0.0
0.5
1.0
-1.0 -0.5 0.0 0.5 1.0Delta X (Pixels)
-1.0
-0.5
0.0
0.5
1.0D
elta
Y (P
ixel
s)
Visit 3Visit 2Visit 1
5/11/16 STUC – STIS
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Informal Variations
Old vs New Combination Marks
Dark and Medium Backgrounds
Performance vs. AO
5/11/16 STUC – STIS
-15 -10 -5 0 5 10 15Arcseconds
-15
-10
-5
0
5
10
15Arcseconds
-0.5
0.5
1.5
2.5
3.5
4.5
S/N
∆V=19.5
∆V=20.4
HR 8799—6 orbits