Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Searching for atmospheric bioindicators in planets around the two nearby stars, Proxima Centauri and Epsilon Eridani - Test cases for retrieval of atmospheric gases with infrared spectroscopy
Léger, A.; Defrère, D.; García Muñoz, A.; Godolt, M.; Grenfell, J.L.; Rauer, H.; Tian, F. (2019). Searching for atmospheric bioindicators in planets around the two nearby stars, Proxima Centauri and Epsilon Eridani - Test cases for retrieval of atmospheric gases with infrared spectroscopy. Astrobiol. 19(6): 797-810. https://dx.doi.org/10.1089/ast.2018.1938
In: Astrobiology. Mary Ann Liebert: Larchmont, N.Y.. ISSN 1531-1074; e-ISSN 1557-8070
|   |
| Author keywords |
Exoplanets; Spectroscopy; Bioindicator; Biosignature; Nearby stars;Proxima Cen b |
| Auteurs | | Top |
- Léger, A.
- Defrère, D.
- García Muñoz, A.
- Godolt, M.
|
- Grenfell, J.L.
- Rauer, H.
- Tian, F.
|
|
| Abstract |
We tested the ability of thermal infrared spectroscopy to retrieve assumed atmospheric compositions for different types of planets orbiting Proxima Centauri and Epsilon Eridani. Six cases are considered, covering a range of atmospheric compositions and some diversity in the bulk composition (rocky, water ocean, hydrogen rich) and the spectral type of the parent star (M and K stars). For some cases, we applied coupled climate chemistry, or climate-only calculations; for other cases, we assumed the atmospheric composition, ground temperature, and surface reflectivity. The IR emission was then calculated from line-by-line radiative transfer models and used to investigate retrieval of input atmospheric species. For the six cases considered, no false positive of the triple bioindicator (H2O, CO2, and O2, in specified conditions) was found. In some cases, results show that the simultaneous acquisition of a visible spectrum would be valuable, for example, when CO2 is very abundant and its 9.4 μm satellite band hides the 9.6 μm O3 band in the IR. In each case, determining the mass appears mandatory to identify the planet's nature and have an idea of surface conditions, which are necessary when testing for the presence of life. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
