Extraction of extrasolar planet spectra from realistically simulated wavefront-corrected coronagraphic fields

John E. Krist; Stuart B. Shaklan; Marie B. Levine

doi:10.1117/12.789788

12 July 2008 Extraction of extrasolar planet spectra from realistically simulated wavefront-corrected coronagraphic fields

John E. Krist, Stuart B. Shaklan, Marie B. Levine

Author Affiliations +

Proceedings Volume 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter; 701044 (2008) https://doi.org/10.1117/12.789788
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The observation of an extrasolar planet in reflected light using a coronagraphic telescope requires a several-orders-ofmagnitude reduction of scattered light around a star by controlling instrumental wavefront errors with deformable mirrors (DMs). This creates a "dark hole" in the background in which diminished speckles of scattered light are at a level similar to or less than that of a planet. There are a number of methods for detecting the planet in this dark field, including image subtraction from another telescope orientation. However, extracting the spectrum of the planet from such a field may be more difficult because the chromatic variation of the speckles can hide spectral features, and the need to disperse the light on a detector increases noise. To investigate the conditions in which spectral extractions are feasible, a physical optics propagation simulation was created of a band-limited Lyot coronagraphic telescope with realistic phase and amplitude errors on each optic and dual sequential DMs to correct the resulting wavefront errors. The Electric Field Conjugation method was used to set the DMs to create a broadband (25%) dark hole from λ = 625 - 878 nm. Simulated planet spectra were then extracted from within this hole using a variety of methods including roll subtraction and spectral filtering. The results of these experiments are presented.

Citation Download Citation

John E. Krist, Stuart B. Shaklan, and Marie B. Levine "Extraction of extrasolar planet spectra from realistically simulated wavefront-corrected coronagraphic fields", Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 701044 (12 July 2008); https://doi.org/10.1117/12.789788

ACCESS THE FULL ARTICLE

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