stis status update - stsci · stis status update john h. debes . space telescope science institute...

SPACE TELESCOPESCIENCE INSTITUTE



Informal Variations

Old vs New Combination Marks

Dark and Medium Backgrounds

STIS Status Update

John H. Debes




Informal Variations



STIS in the News

5/11/16 STUC – STIS

AU Mic—STIS Coronagraphy

STIS FUV Spectroscopy

Ganymede—STIS FUV Imaging




Informal Variations




Introducing the STIS Team

John Debes Lead

Charles ProffiC Deputy Molly Peeples Allyssa Riley Nolan Walborn

Sean Lockwood Tala Monroe




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Cycle 23 CCD Calibration Program


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




Informal Variations



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




Informal Variations



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


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




Informal Variations



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





Informal Variations



BAR5-0.2” Inner Working Angle


12923 (PI: Gaspar, outsourced calibraQon)




Informal Variations



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





Informal Variations



Sub-Pixel Grid Dithers


−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




Informal Variations



BAR5-10-6 Contrast or Better


GPI (NIR)

•  Comparable contrast performance to GPI

•  Visible light less sensi.ve to planets

•  More sensi.ve to dust/stellar companions




Informal Variations



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





Informal Variations



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!





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Back-up slides




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Estimated Performance vs. AO


V=6.7

V=1.1




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Team Organization


Lead Deputy

Calibra.on Monroe Peeples

Front End Lockwood ProffiY

Pipeline ProffiY

User Support Walborn Peeples

ETC Peeples Lockwood

CCDs Lockwood

MAMAs Peeples




Informal Variations



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





Informal Variations



SPHERE/ZIMPOL

Roelfsema et al., 2014 5/11/16 STUC – STIS




Informal Variations



STIS Coronagraphy


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)




Informal Variations



VisAO

Males et al., 2014

Beta Pic b @Y band Contrast=10-‐5 @ 0.4”





Informal Variations



Centroiding


a) b)

d)c)

−7

−6

−5

−4

log 1

0 [C

ontra

st]




Informal Variations



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





Informal Variations



STIS Calibration Lamps (II)


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




Informal Variations



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





Informal Variations



Performance vs. AO


-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

stis status update - stsci · stis status update john h. debes . space telescope science institute...

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