Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8232
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dc.contributor.authorSingla, Manika-
dc.contributor.authorSengupta, S-
dc.date.accessioned2023-08-01T05:32:01Z-
dc.date.available2023-08-01T05:32:01Z-
dc.date.issued2023-08-
dc.identifier.citationNew Astronomy, Vol. 102, 102024en_US
dc.identifier.issn1384-1092-
dc.identifier.urihttp://hdl.handle.net/2248/8232-
dc.descriptionRestricted Accessen_US
dc.description.abstractIn order to recognize a habitable exoplanet from future observed spectra, we present new model reflected spectra and geometric albedo for modern and prebiotic (∼3.9 Ga) Earth-like exoplanets orbiting within the habitable zone of stars of spectral types F, G, K and M. We compute this for various atmospheric and surface compositions of the planets. Molecules that are potential biosignatures and act as greenhouse agents are incorporated in our model atmosphere. Various combinations of solid and liquid materials such as ocean, coast, land consisting of trees, grass, sand or rocks determine the surface albedo of the planet. Geometric albedo and model reflected spectra for a set of nine potential habitable planets, including Proxima Centauri b, TRAPPIST-1d, Kepler-1649c and Teegarden’s Star-b, are also presented. We employ the opacity data derived by using the open-source package Exo-Transmit and adopt different atmospheric Temperature–Pressure profiles depending on the properties of the terrestrial exoplanets. The model-reflected spectra are constructed by numerically solving the multiple scattering radiative transfer equations. We verified our model reflected spectra for a few specific cases by comparing with those published by other researchers. We demonstrate that prebiotic Earth-like exoplanets and present Earth-like exoplanets with increased amount of greenhouse gases in their atmospheres scatter more starlight in the optical. We also present the transmission spectra for modern and prebiotic Earth-like exoplanets with cloudy and cloudless atmospheres.en_US
dc.language.isoenen_US
dc.publisherElsevier B.V.en_US
dc.relation.urihttps://doi.org/10.1016/j.newast.2023.102024-
dc.rights© Elsevier B.V.-
dc.subjectRadiative transferen_US
dc.subjectMethods: numericalen_US
dc.subjectPlanets and satellites: terrestrial planetsen_US
dc.subjectAtmosphereen_US
dc.titleNew models of reflection spectra for terrestrial exoplanets: Present and prebiotic Earth orbiting around stars of different spectral typesen_US
dc.typeArticleen_US
Appears in Collections:IIAP Publications



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