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dc.contributor.author
Vaughan, Sophia R.
dc.contributor.author
Gebhard, Timothy D.
dc.contributor.author
Bott, Kimberly
dc.contributor.author
Casewell, Sarah L.
dc.contributor.author
Cowan, Nicolas B.
dc.contributor.author
Doelman, David S.
dc.contributor.author
Kenworthy, Matthew
dc.contributor.author
Mazoyer, Johan
dc.contributor.author
Millar-Blanchaer, Maxwell A.
dc.contributor.author
Trees, Victor J.H
dc.contributor.author
Stam, Daphne M.
dc.contributor.author
Absil, Olivier
dc.contributor.author
Altinier, Lisa
dc.contributor.author
Baudoz, Pierre
dc.contributor.author
Belikov, Ruslan
dc.contributor.author
Bidot, Alexis
dc.contributor.author
Birkby, Jayne L.
dc.contributor.author
Bonse, Markus J.
dc.contributor.author
Brandl, Bernhard
dc.contributor.author
Carlotti, Alexis
dc.contributor.author
et al.
dc.date.accessioned
2023-09-05T09:22:05Z
dc.date.available
2023-09-02T03:15:18Z
dc.date.available
2023-09-05T09:22:05Z
dc.date.issued
2023-10
dc.identifier.issn
0035-8711
dc.identifier.issn
1365-2966
dc.identifier.other
10.1093/mnras/stad2127
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/629356
dc.identifier.doi
10.3929/ethz-b-000629356
dc.description.abstract
NASA is engaged in planning for a Habitable Worlds Observatory (HabWorlds ), a coronagraphic space mission to detect rocky planets in habitable zones and establish their habitability. Surface liquid water is central to the definition of planetary habitability. Photometric and polarimetric phase curves of starlight reflected by an exoplanet can reveal ocean glint, rainbows, and other phenomena caused by scattering by clouds or atmospheric gas. Direct imaging missions are optimized for planets near quadrature, but HabWorlds ’ coronagraph may obscure the phase angles where such optical features are strongest. The range of accessible phase angles for a given exoplanet will depend on the planet’s orbital inclination and/or the coronagraph’s inner working angle (IWA). We use a recently created catalog relevant to HabWorlds of 164 stars to estimate the number of exo-Earths that could be searched for ocean glint, rainbows, and polarization effects due to Rayleigh scattering. We find that the polarimetric Rayleigh scattering peak is accessible in most of the exo-Earth planetary systems. The rainbow due to water clouds at phase angles of ∼20° − 60° would be accessible with HabWorlds  for a planet with an Earth equivalent instellation in ∼46 systems, while the ocean glint signature at phase angles of ∼130° − 170° would be accessible in ∼16 systems, assuming an IWA = 62 mas (3λ/D). Improving the IWA = 41 mas (2λ/D) increases accessibility to rainbows and glints by factors of approximately 2 and 3, respectively. By observing these scattering features, HabWorlds could detect a surface ocean and water cycle, key indicators of habitability.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Oxford University Press
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
instrumentation: high angular resolution
en_US
dc.subject
planets and satellites: atmospheres
en_US
dc.subject
planets and satellites: terrestrial planets
en_US
dc.title
Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2023-08-03
ethz.journal.title
Monthly Notices of the Royal Astronomical Society
ethz.journal.volume
524
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
Mon. Not. R. Astron. Soc.
ethz.pages.start
5477
en_US
ethz.pages.end
5485
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2023-09-02T03:15:20Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2023-09-05T09:22:06Z
ethz.rosetta.lastUpdated
2024-02-03T03:11:06Z
ethz.rosetta.versionExported
true
ethz.COinS
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