Mr. Dori Blakely Profile

Dori Blakely

at Univ of Victoria

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 28 August 2024 Presentation

Aperture masking interferometry with JWST: calibration and observing strategies

Benjamin J. Pope, Louis Desdoigts, Dori Blakely, Peter Tuthill, Shrishmoy Ray

Proceedings Volume 13095, 1309512 (2024) https://doi.org/10.1117/12.3020039

Read Abstract +

The James Webb Space Telescope Aperture Masking Interferometer provides NIRISS with its highest angular resolution imaging mode, an ultra-stable non-redundant masking Fizeau interferometer. Until recently, the precision of its interferometric visibilities has been limited to ~ 1% by systematic uncertainties in its optical state and detector noise properties. Using a data-driven calibration of AMI with a differentiable forwards model, this can be improved by more than an order of magnitude, uniquely enabling high angular resolution science not possible from the ground. We will discuss the pipeline and observing strategies required to achieve this, illustrated with science highlights enabled this way from the first two years of AMI data, and generalizations of this approach to kernel phase interferometry.

Proceedings Article | 28 August 2024 Presentation

Precise calibration of the brighter-fatter effect in the JWST/NIRISS detector

Benjamin J. Pope, Louis Desdoigts, Peter Tuthill, Dori Blakely

Proceedings Volume PC13103, PC131030K (2024) https://doi.org/10.1117/12.3020027

Read Abstract +

Charge migration in infrared detectors such as in JWST leads to a 'brighter-fatter effect', where photoelectrons from bright pixels spill to nearby faint pixels and blur the pixel response function at its finest spatial scales - a limiting noise floor for high angular resolution astronomy. We demonstrate an effective forwards model: a nonlinear convolution predicting the effect on every pixel as a polynomial of the pixels in its neighbourhood, learning the coefficients by gradient descent together with a differentiable model of the point spread function. We apply this to the JWST/NIRISS Aperture Masking Interferometer, inferring an accurate model for the BFE in NIRISS; overcoming the main barrier to precise interferometric observations with JWST; and illustrating a simple path to high-quality BFE calibration in other JWST instruments and infrared detectors in general.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years