The inner working angle you need to detect ocean glints with HabWorlds

Maxwell A. Millar-Blanchaer; Sophia R. Vaughan; Kimberly Bott; Sarah L. Casewell; Nicolas B. Cowan; David S. Doelman; Timothy D. Gebhard; Matthew Kenworthy; Johan Mazoyer

doi:10.1117/12.2677950

6 October 2023 The inner working angle you need to detect ocean glints with HabWorlds

Maxwell A. Millar-Blanchaer, Sophia R. Vaughan, Kimberly Bott, Sarah L. Casewell, Nicolas B. Cowan, David S. Doelman, Timothy D. Gebhard, Matthew Kenworthy, Johan Mazoyer

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126801J (2023) https://doi.org/10.1117/12.2677950
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

NASA recently announced the Habitable Worlds Observatory, a coronagraphic mission to detect rocky planets in their habitable zones, assess their habitability, and search for biosignatures. Surface liquid water is central to the definition of planetary habitability. Photometric and polarimetric phase variations are one of the main ways we expect to be able to detect oceans, via specular reflections off the surface water. The range of scattering phases accessible for an exoplanet can be limited by its orbital inclination or the coronagraph’s inner working angle. We use the list of target stars for the Habitable Worlds Observatory to estimate the number of exo-Earths that could be searched for non-Lambertian scattering phenomena. Here we will present our methodology and the relationship between inner working angle and accessible phase angles. From these results, we quantify the number of systems for which we expect to be able to detect ocean glint (and other scattering processes), as a function of the accessible inner working angle.

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Maxwell A. Millar-Blanchaer, Sophia R. Vaughan, Kimberly Bott, Sarah L. Casewell, Nicolas B. Cowan, David S. Doelman, Timothy D. Gebhard, Matthew Kenworthy, and Johan Mazoyer "The inner working angle you need to detect ocean glints with HabWorlds", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126801J (6 October 2023); https://doi.org/10.1117/12.2677950

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KEYWORDS

Scattering

Coronagraphy

Observatories

Water

Exoplanets

Liquids

Planets

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