A5052974183- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Atmospheric and Environmental Gas Dynamics
- Spaceflight effects on biology
- Space Exploration and Technology
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Atmospheric chemistry and aerosols
- High-pressure geophysics and materials
- Space Science and Extraterrestrial Life
- Atmospheric aerosols and clouds
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Paleontology and Stratigraphy of Fossils
- Solar and Space Plasma Dynamics
- Geological and Geophysical Studies
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Spacecraft Design and Technology
Technische Universität Berlin
2011-2021
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2013-2021
Planet
2017
Leibniz Institute for Astrophysics Potsdam
2006
Atmospheric temperature and mixing ratio profiles of terrestrial planets vary with the spectral energy flux distribution for different types M-dwarf stars planetary gravity. We investigate resulting effects on appearance molecular absorption bands, that are relevant as indicators potential habitability during primary secondary eclipse transiting Earth-like biomass emissions. computed using a plane-parallel, 1D climate model coupled chemistry model. then calculate simulated spectra...
Plate tectonics is a fundamental component for the habitability of Earth. Yet whether it recurrent feature terrestrial bodies orbiting other stars or unique to Earth unknown. The stagnant lid may rather be most common tectonic expression on such bodies. To understand stagnant-lid planet can habitable, i.e. host liquid water at its surface, we model thermal evolution mantle, volcanic outgassing H$_2$O and CO$_2$, resulting climate an Earth-like lacking plate tectonics. We used 1D...
We investigate the spectral appearance of Earth-like exoplanets in HZ different main sequence stars at orbital distances. furthermore discuss for which these scenarios biomarker absorption bands may be detected during primary or secondary transit with near-future telescopes and instruments.We analyze spectra taking into account filter bandpasses two photometric instruments planned to mounted JWST. filters molecular are detectable when using space-borne JWST ground-based telescope E-ELT....
The magma ocean (MO) is a crucial stage in the build-up of terrestrial planets. Its solidification and accompanying outgassing volatiles set conditions for important processes occurring later or even simultaneously, such as solid-state mantle convection atmospheric escape. To constrain duration global-scale Earth MO we have built applied 1D interior model coupled alternatively with grey H2O/CO2 atmosphere pure H2O treated line-by-line described companion paper by Katyal et al. (2019). We...
Understanding the evolution of Earth and potentially habitable Earth-like worlds is essential to fathom our origin in Universe. The search for planets zone investigation their atmospheres with climate photochemical models a central focus exoplanetary science. Taking as reference planets, scientific goal understand what interactions were between atmosphere, geology, biology on early Earth. Great Oxidation Event (GOE) Earth's history was certainly caused by interplay, but controlling processes...
Aims. The planetary system around the M star Gliese 581 contains at least three close-in potentially low-mass planets, Gl 581c, d, and e. In order to address question of habitability 581d, we performed detailed atmospheric modeling studies for several scenarios.
The effects of multi-layered clouds in the atmospheres Earth-like planets orbiting different types stars are studied. radiative cloud particles directly correlated with their wavelength-dependent optical properties. Therefore incident stellar spectra may play an important role for climatic effect clouds. We discuss influence mean properties measured Earth's atmosphere on surface temperatures and Bond albedos main sequence dwarf stars.
Ocean planets are volatile-rich planets, not present in our Solar system, which thought to be dominated by deep, global oceans. This results the formation of high-pressure water ice, separating planetary crust from liquid ocean and, thus, also atmosphere. Therefore, instead a carbonate–silicate cycle like on Earth, atmospheric carbon dioxide concentration is governed capability dissolve (CO2). In study, we focus CO2 between atmosphere and determines content. The amount fundamental quantity...
Spectral characterization of super-Earth atmospheres for planets orbiting in the habitable zone M dwarf stars is a key focus exoplanet science. A central challenge to understand and predict expected spectral signals atmospheric biosignatures (species associated with life). Our work applies global-mean radiative-convective-photochemical column model assuming planet an Earth-like biomass planetary development. We investigated gravities 1g 3g surface pressure 1 bar around classes from M0 M7....
The habitable zone (HZ) describes the range of orbital distances around a star where existence liquid water on surface an Earth-like planet is in principle possible. While 3D climate studies can calculate vapor, ice albedo, and cloud feedback self-consistently therefore allow for deeper understanding identification relevant processes, 1D model rely fewer assumptions be more easily applied to large parameter space possible exoplanets. We evaluate applicability models estimate potential...
We investigate the detectability of atmospheric spectral features Earth-like planets in habitable zone (HZ) around M dwarfs with future James Webb Space Telescope (JWST). use a coupled 1D climate-chemistry-model to simulate influence range observed and modelled M-dwarf spectra on planets. The simulated atmospheres served as input for calculation transmission hypothetical planets, using line-by-line radiative transfer model. To spectroscopic absorption bands JWST we further developed...
Abstract The nearby TRAPPIST-1 planetary system is an exciting target for characterizing the atmospheres of terrestrial planets. planets e, f, and g lie in circumstellar habitable zone could sustain liquid water on their surfaces. During extended pre–main-sequence phase TRAPPIST-1, however, may have experienced extreme loss, leading to a desiccated mantle. presence or absence ocean challenging determine with current next-generation telescopes. Therefore, we investigate whether indirect...
Abstract The atmospheres of small, potentially rocky exoplanets are expected to cover a diverse range in composition and mass. Studying such objects therefore requires flexible wide-ranging modeling capabilities. We present this work the essential development steps that lead our radiative transfer module, REDFOX, validate REDFOX for solar system planets Earth, Venus, Mars, as well steam atmospheres. is k -distribution model using correlated- approach with random overlap method calculation...
Abstract We explore the application of machine-learning based on mixture density neural networks (MDNs) to interior characterization low-mass exoplanets up 25 Earth masses constrained by mass, radius, and fluid Love number, k 2 . create a data set 900,000 synthetic planets, consisting an iron-rich core, silicate mantle, high-pressure ice shell, gaseous H/He envelope, train MDN using planetary mass radius as inputs network. For this layered structure, we show that is able infer distribution...
Aims. We study the impact of multi-layered clouds (low-level water and high-level ice clouds) on thermal emission spectra Earth-like planets orbiting different types stars. Clouds have an important influence such planetary due to their wavelength dependent absorption scattering properties. also investigate ability derive information about surface temperatures from low-resolution spectra.
With the recent discoveries of terrestrial planets around active M-dwarfs, destruction processes masking possible presence life are receiving increased attention in exoplanet community. We investigate potential biosignatures having Earth-like (N$_2$-O$_2$) atmospheres orbiting habitable zone M-dwarf star AD Leo. These bombarded by high energetic particles which can create showers secondary at surface. apply our cloud-free 1D climate-chemistry model to study influence key particle shower...