For This Session You Will Need: A recent version of the - PowerPoint PPT Presentation

For This Session You Will Need: • A recent version of the Astronomer’s Proposal Tool (APT): Google Search “JWST APT” or go to http://www.stsci.edu/hst/proposing/apt • The Coronagraph Visibility Tool (CVT): Google Search “JWST CVT” or go to https://jwst- docs.stsci.edu/display/JPP/JWST+Coronagraphic+Visibi lity+Tool+Help

Implementing Coronagraphic Observations in APT Chris Stark

3 Tools You Will Want for Coronagraphic Observation Planning JWST Exposure Time Calculator (ETC) JWST Coronagraph Visibility Tool (CVT) Astronomer’s Proposal Tool (APT)

3 Tools You Will Want for Coronagraphic Observation Planning Recommended Sequence: 1. JWST Coronagraph Visibility Tool (CVT) 2. JWST Exposure Time Calculator (ETC) 3. Astronomer’s Proposal Tool (APT)

Step 1: JWST Corongraph Visibility Tool (CVT)

Allowable JWST Orientations Solar elongations from 85° – 135°

Creating a PA Visibility Tool Allowable JWST Orientations Rotating about Sun axis forms stripe on ecliptic sphere

Creating a PA Visibility Tool Visibility Depends on Ecliptic Latitude V3 PA varies over the course of a viewing block Continuous Viewing Zone 1 Annual Viewing Block 2 Semi-Annual Viewing Blocks

Allowable JWST Orientations Solar elongations from 85° – 135°, V1 roll angles range from ±3.5° to ±7° ±3.5° ±7°

Example of 1 Annual Viewing Block HD 10647 Wide range of possible PAs Allowed PAs Observable Window Solar Elongation

Example of 2 Semi-annual Viewing HD 141569 Blocks Limited range of PAs, larger roll dither allowed at elongation ~ 135° ~7° ~14°

Let’s Use the CVT!

Step 2: JWST Exposure Time Calculator (ETC) (Discussed yesterday)

Step 3: Astronomer’s Proposal Tool (APT)

Guidelines to Follow: 1. Thou shalt observe your science target at 2 roll angles, differing by at least one degree (a “roll dither”) 2. Thou shalt observe a reference star to measure the PSF (for PSF subtraction by the pipeline) 3. Thou shalt make these a non-interruptible sequence. Figure credit: M. Perrin

Guidelines to Follow: 1. Thou shalt observe your science target at 2 roll angles, differing by at least one degree (a “roll dither”) Mitigates bad pixels in science image Rotates speckles wrt astrophysical scene

Guidelines to Follow: 2. Thou shalt observe a reference star to measure the PSF (for PSF subtraction by the pipeline) • Increases contrast by subtracting reference PSF from science image • Reference PSF star should be uncontaminated • Reference PSF should be close in spectral type (see supporting docs) • Reference PSF should be bright (shorter exposure time) Rf PSF hld b l t th i tt ( h t

Guidelines to Follow: PSF spectral type selection guidelines: a future JDOX page Currently at http://www.starkspace.com/JWST_PSF_references.pdf Jarron Leisenring

Guidelines to Follow: 3. Thou shalt make these a non-interruptible sequence. • Reduces PSF changes between science and reference observations; higher contrast • Science target & reference must be simultaneously visible

The Basic Coronagraphic Sequence Figure credit: M. Perrin Non-interruptible Obs # Target Roll Inst Mask Filter θ 0 1 Science θ 0 + ∆θ 2 Science 3 Reference N/A

A Multi-Filter Coronagraphic Sequence Obs # Target Roll Inst Mask Filter Non-interruptible θ 0 1 Science NIRCam 210R F182M, F210M θ 0 + ∆θ 2 Science NIRCam 210R F182M, F210M 3 Reference N/A NIRCam 210R F182M, F210M

A Multi-Instrument Coronagraphic Sequence Obs # Target Roll Inst Mask Filter Non-interruptible θ 0 1 Science NIRCam 210R F182M θ 1 2 Science MIRI LYOT F2300C θ 0 + ∆θ 3 Science NIRCam 210R F182M θ 1 + ∆θ 4 Science MIRI LYOT F2300C 5 Reference N/A NIRCam 210R F182M 6 Reference N/A MIRI LYOT F2300C

A Multi-Epoch Coronagraphic Sequence Non-interruptible Obs # Target Roll Inst Mask Filter θ 0 1 Science NIRCam SWB F210M θ 0 + ∆θ 2 Science NIRCam SWB F210M 3 Reference N/A NIRCam SWB F210M θ 1 Non-interruptible 4 Science NIRCam SWB F210M θ 1 + ∆θ 5 Science NIRCam SWB F210M 6 Reference N/A NIRCam SWB F210M

Let’s Use APT! Walk-through #1: Create a basic coronagraph sequence for GJ 758 using MIRI Lyot mask

Let’s Use APT! Walk-through #1: Create a basic coronagraph sequence for GJ 758 using MIRI Lyot mask Independent Task: Add observations using MIRI 4QPM/1065 mask

Let’s Use APT! Walk-through #2: Create a basic coronagraph sequence for Beta Pic disk using NIRCam 210R mask + F210M filter

Let’s Use APT! Walk-through #2: Create a basic coronagraph sequence for Beta Pic disk using NIRCam 210R mask + F210M filter Independent Task: Add observations using SWB mask + F210M filter

Let’s Use APT! Walk-through #3: Make a multi-epoch NIRCam SWB observation of Beta Pic

Overheads & Efficient Observing • Visit-level overheads can be seen in the Form Editor view by clicking on a single visit (expand observation folder, then expand the observation) • Detailed overheads can be seen by exporting a .times file