D. M. Stam
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View article: MONKI: a three-dimensional Monte Carlo simulator of total and polarised radiation reflected by planetary atmospheres
MONKI: a three-dimensional Monte Carlo simulator of total and polarised radiation reflected by planetary atmospheres Open
Spectropolarimetry is a powerful tool for characterising planetary atmospheres and surfaces. For the design and operation of spectro(polari)metric instrumentation, numerically simulated signals of the measured radiation are essential. Here…
View article: VenSpec Radiative Transfer Modeling Working Group
VenSpec Radiative Transfer Modeling Working Group Open
The VenSpec suite is a set of three spectrometers on board the EnVision M5 mission, which was adopted by ESA in 2024 to be launched in late 2031. EnVision is a medium class mission designed to assess, and possibly quantify, the nature and …
View article: A general polarimetric model for transiting and nontransiting ringed exoplanets
A general polarimetric model for transiting and nontransiting ringed exoplanets Open
Context . The detection and characterization of exorings (rings around exoplanets) will help us to better understand the origin and evolution of planetary rings in the Solar System and beyond. However, exorings are still elusive, and new a…
View article: Polarimetry of Solar System minor bodies and planets
Polarimetry of Solar System minor bodies and planets Open
The study of the polarisation of light is a powerful tool for probing the physical and compositional properties of astrophysical sources, including Solar System objects. In this article, we provide a comprehensive overview of the state-of-…
View article: The dark days are overcast: iron-bearing clouds on HD 209458 b and WASP-43 b can explain low-dayside albedos
The dark days are overcast: iron-bearing clouds on HD 209458 b and WASP-43 b can explain low-dayside albedos Open
We simulate the geometric albedo spectra of hot Jupiter exoplanets HD 209458 b and WASP-43 b, based on global climate model post-processed with kinetic cloud models. We predict WASP-43 b to be cloudy throughout its dayside, while HD 209458…
View article: A general polarimetric model for transiting and non-transiting ringed exoplanets
A general polarimetric model for transiting and non-transiting ringed exoplanets Open
We explore the potential of polarimetry as a tool for detecting and characterizing exorings. For that purpose, we have improved the publicly available photometric code Pryngles by adding the results of radiative transfer calculations that …
View article: Modelling reflected polarized light from close-in giant exoplanet WASP-96b using PolHEx (Polarization of hot exoplanets)
Modelling reflected polarized light from close-in giant exoplanet WASP-96b using PolHEx (Polarization of hot exoplanets) Open
We present the Polarization of Hot Exoplanets (PolHEx) code for modelling the total flux (F) and degree of linear Polarization (P) of light spectra reflected by close-in, tidally locked exoplanets. We use the output from a global climate m…
View article: Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory
Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory Open
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 pl…
View article: Modelling reflected polarised light from close-in giant exoplanet WASP-96b using PolHEx (Polarisation of Hot Exoplanets)
Modelling reflected polarised light from close-in giant exoplanet WASP-96b using PolHEx (Polarisation of Hot Exoplanets) Open
We present the Polarisation of Hot Exoplanets (PolHEx) code for modelling the total flux (F) and degree of linear polarisation (P) of light spectra reflected by close-in, tidally locked exoplanets. We use the output from a global climate m…
View article: Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory" Open
Data for the paper on "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
View article: Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
Data for "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory" Open
Data for the paper on "Chasing rainbows and ocean glints: Inner working angle constraints for the Habitable Worlds Observatory"
View article: Spectral observations at the Canary Island Long-Baseline Observatory (CILBO): calibration and datasets
Spectral observations at the Canary Island Long-Baseline Observatory (CILBO): calibration and datasets Open
The Canary Island Long-Baseline Observatory (CILBO) is a double-station meteor camera setup located on the Canary Islands operated by ESA's Meteor Research Group since 2010. Observations of meteors are obtained in the visual wavelength ban…
View article: Polarized Signatures of a Habitable World: Comparing Models of an Exoplanet Earth with Visible and Near-infrared Earthshine Spectra
Polarized Signatures of a Habitable World: Comparing Models of an Exoplanet Earth with Visible and Near-infrared Earthshine Spectra Open
In the JWST, Extremely Large Telescopes, and LUVOIR era, we expect to characterize a number of potentially habitable Earth-like exoplanets. However, the characterization of these worlds depends crucially on the accuracy of theoretical mode…
View article: From exo-Earths to exo-Venuses: Flux and polarization signatures of reflected light
From exo-Earths to exo-Venuses: Flux and polarization signatures of reflected light Open
Context . Terrestrial-type exoplanets in or near stellar habitable zones appear to be ubiquitous. It is, however, unknown which of these planets have temperate, Earth-like climates or for example, extreme Venus-like climates. Aims. Technic…
View article: From exo-Earths to exo-Venuses -- Flux and Polarization Signatures of Reflected Light
From exo-Earths to exo-Venuses -- Flux and Polarization Signatures of Reflected Light Open
Terrestrial exoplanets in habitable zones are ubiquitous. It is, however, unknown which have Earth-like or Venus-like climates. Distinguishing different planet-types is crucial for determining whether a planet could be habitable. We invest…
View article: Polarized Signatures of a Habitable World: Comparing Models of an Exoplanet Earth with Visible and Near-infrared Earthshine Spectra
Polarized Signatures of a Habitable World: Comparing Models of an Exoplanet Earth with Visible and Near-infrared Earthshine Spectra Open
In the JWST, Extremely Large Telescopes, and LUVOIR era, we expect to characterize a number of potentially habitable Earth-like exoplanets. However, the characterization of these worlds depends crucially on the accuracy of theoretical mode…
View article: Spectropolarimetry of Mars: Why and how?
Spectropolarimetry of Mars: Why and how? Open
<p class="p1"><span class="s1">Polarimetry of sunlight that is reflected by a planet or that is transmitted through its atmosphere is a powerful tool for the characterisation of the planetary atmosphere and,…
View article: Spectropolarimetry of life: airborne measurements from a hot air balloon
Spectropolarimetry of life: airborne measurements from a hot air balloon Open
Does life exist outside our Solar System? A first step towards searching for life outside our Solar System is detecting life on Earth by using remote sensing applications. One powerful and unambiguous biosignature is the circular polarizat…
View article: Spectral Observations at the CILBO Observatory: Calibration and Data Sets
Spectral Observations at the CILBO Observatory: Calibration and Data Sets Open
The Canary Island Long-Baseline Observatory (CILBO) is a double station meteor camera setup located on the Canary Islands and operated by ESA’s Meteor Research Group since 2010. Observations of meteors are obtained in the visual wavelength…
View article: Ocean signatures in the total flux and polarization spectra of Earth-like exoplanets
Ocean signatures in the total flux and polarization spectra of Earth-like exoplanets Open
Context. Numerical simulations of starlight that is reflected by Earth-like exoplanets predict habitability signatures that can be searched for with future telescopes. Aims. We explore signatures of water oceans in the flux and polarizatio…
View article: Ocean signatures in the total flux and polarization spectra of\n Earth-like exoplanets
Ocean signatures in the total flux and polarization spectra of\n Earth-like exoplanets Open
Numerical simulations of starlight that is reflected by Earth-like exoplanets\npredict habitability signatures that can be searched for with future\ntelescopes. We explore signatures of water oceans in the flux and polarization\nspectra of…
View article: Terrestrial Planet Optical Phase Curves. I. Direct Measurements of the Earth
Terrestrial Planet Optical Phase Curves. I. Direct Measurements of the Earth Open
NASA’s EPOXI mission used the Deep Impact spacecraft to observe the disk-integrated Earth as an analog to terrestial exoplanets’ appearance. The mission took five 24 hr observations in 2008–2009 at various phase angles (57.°7–86.°4) and ra…
View article: ESA Voyage 2050 White Paper: Detecting life outside our solar system with a large high-contrast-imaging mission
ESA Voyage 2050 White Paper: Detecting life outside our solar system with a large high-contrast-imaging mission Open
In this white paper, we recommend the European Space Agency plays a proactive role in developing a global collaborative effort to construct a large high-contrast imaging space telescope, e.g. as currently under study by NASA. Such a missio…
View article: Biosignatures of the Earth
Biosignatures of the Earth Open
Context. Homochirality is a generic and unique property of life on Earth and is considered a universal and agnostic biosignature. Homochirality induces fractional circular polarization in the incident light that it reflects. Because this c…
View article: LOUPE: Observing the Earth from the Moon to prepare for detecting life on Earth-like exoplanets
LOUPE: Observing the Earth from the Moon to prepare for detecting life on Earth-like exoplanets Open
LOUPE, the Lunar Observatory for Unresolved Polarimetry of the Earth, is a small, robust spectro-polarimeter for observing the Earth as if it were an exoplanet, designed to accompany any landing, roving or orbiting mission to the Moon. Det…
View article: Near-IR Investigation of the Thermal Structure of Venusian Deep Atmosphere
Near-IR Investigation of the Thermal Structure of Venusian Deep Atmosphere Open
Introduction: Given the extreme conditions in the lower atmosphere of Venus, various in-situ missions faced instrumental failures. As a result, the thermal structure of the deep atmosphere, particularly below 12 km is not well known. In Ve…