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Artistic representations of the only known planets around other stars (exoplanets) with any possibility to support life as we know it. Measuring the atmospheric pressure of a distant exoplanet may seem like a daunting task but astronomers at the University of Washington have now developed a new technique to do just that. When exoplanet discoveries first started rolling in, astronomers laid emphasis in finding planets within the habitable zone — the band around a star where water neither freezes nor boils.
Atmospheric pressure is just as important in gauging whether or not the surface of an exoplanet may likely hold liquid water.
The method developed by Amit Misra, a PhD candidate, involves isolating “dimers” — bonded pairs of molecules that tend to form at high pressures and densities in a planet’s atmosphere — not to be confused with “monomers,” which are simply free-floating molecules.
We may indirectly detect dimers in an exoplanet’s atmosphere when the exoplanet transits in front of its host star.
Dimers absorb light in a distinctive pattern, which typically has four peaks due to the rotational motion of the molecules. While water dimers were detected in the Earth’s atmosphere as early as last year, powerful telescopes soon to come online may enable astronomers to use this method in observing distant exoplanets. Detecting dimers in an exoplanet’s atmosphere would not only help us evaluate the atmospheric pressure, and therefore the state of water on the surface, but other biosignature markers as well.
The paper has been published in the February issue of Astrobiology and is available for download here.
Hydrogen bonding is what clumps water molecules together, temporarily linking an H from one molecule to an O from another molecule. Enter your email address to subscribe to this blog and receive notifications of new posts by email.
Ensuite choisissez si vous jouez chacun pour sa gueule (FFA) ou en equipe (Team) et cliquez sur Play. Elles constituent une tres bonne protection car les percuter provoquera une division massive de vos ennemis.
Malheureusement, l’inspiration ne vint pas et le maestro enchaina les scores mediocres ou au mieux moyens. Gary Gray et son scenariste Chris Morgan ont confie dans les colonnes de Deadline avoir ecrit un nouveau grand mechant feminin pour l’episode 8 de la saga Fast and Furious et ce sera une femme ! Maintenant que le duo est reforme, esperons que Michael Bay, pourtant engage sur Transformers 5, acceptera a son tour de mettre en boite le film d’or-et-deja attendu pour le 17 Fevrier 2017.
Dans tout les cas ce sera desormais en 2018 qu’il faudra esperer avoir des nouvelles de Pandora. But characterizing the environment and habitability of an exoplanet doesn’t depend on the planet’s surface temperature alone. Anyone familiar with camping at high-altitude should have a good understanding of how pressure affects water’s boiling point.
While there are many types of dimers, the research team focused exclusively on oxygen molecules, which are temporarily bound to each other through hydrogen bonding.
As the star’s light passes through a thin layer of the planet’s atmosphere the dimers absorb certain wavelengths of it. The team analyzed the likelihood of using the James Webb Space Telescope to make such a detection and found it challenging but possible. Oxygen is directly tied to photosynthesis, and will most likely not be abundant in an exoplanet’s atmosphere unless it is regularly produced by algae or other plants. Man of Steel et Batman V Superman, deux bandes-originales repetitives et peu memorables (meme avec Junkie XL venu a sa rescousse).
Meme qu’ils aimeraient que Charlize Theron, forte de sa prestation dans Mad Max Fury Road, endosse le role !
Once the starlight reaches Earth it’s imprinted with the chemical fingerprints of the dimers.
This difference is much more pronounced in dimers than in monomers, allowing astronomers to gain additional information about the atmospheric pressure based on the ratio of these two signatures.
Mais bon, n’oublions pas que maintenant que James Cameron est un maitre du monde assume depuis Titanic et Avatar, donc inutile de dire qu’il va prendre tout son temps !
Artistic representations of the only known planets around other stars (exoplanets) with any possibility to support life as we know it. Measuring the atmospheric pressure of a distant exoplanet may seem like a daunting task but astronomers at the University of Washington have now developed a new technique to do just that. When exoplanet discoveries first started rolling in, astronomers laid emphasis in finding planets within the habitable zone — the band around a star where water neither freezes nor boils.
Atmospheric pressure is just as important in gauging whether or not the surface of an exoplanet may likely hold liquid water.
The method developed by Amit Misra, a PhD candidate, involves isolating “dimers” — bonded pairs of molecules that tend to form at high pressures and densities in a planet’s atmosphere — not to be confused with “monomers,” which are simply free-floating molecules.
We may indirectly detect dimers in an exoplanet’s atmosphere when the exoplanet transits in front of its host star.
Dimers absorb light in a distinctive pattern, which typically has four peaks due to the rotational motion of the molecules. While water dimers were detected in the Earth’s atmosphere as early as last year, powerful telescopes soon to come online may enable astronomers to use this method in observing distant exoplanets. Detecting dimers in an exoplanet’s atmosphere would not only help us evaluate the atmospheric pressure, and therefore the state of water on the surface, but other biosignature markers as well.
The paper has been published in the February issue of Astrobiology and is available for download here.

Hydrogen bonding is what clumps water molecules together, temporarily linking an H from one molecule to an O from another molecule. Enter your email address to subscribe to this blog and receive notifications of new posts by email.
Ensuite choisissez si vous jouez chacun pour sa gueule (FFA) ou en equipe (Team) et cliquez sur Play. Elles constituent une tres bonne protection car les percuter provoquera une division massive de vos ennemis.
Malheureusement, l’inspiration ne vint pas et le maestro enchaina les scores mediocres ou au mieux moyens. Gary Gray et son scenariste Chris Morgan ont confie dans les colonnes de Deadline avoir ecrit un nouveau grand mechant feminin pour l’episode 8 de la saga Fast and Furious et ce sera une femme ! Maintenant que le duo est reforme, esperons que Michael Bay, pourtant engage sur Transformers 5, acceptera a son tour de mettre en boite le film d’or-et-deja attendu pour le 17 Fevrier 2017.
Dans tout les cas ce sera desormais en 2018 qu’il faudra esperer avoir des nouvelles de Pandora. But characterizing the environment and habitability of an exoplanet doesn’t depend on the planet’s surface temperature alone. Anyone familiar with camping at high-altitude should have a good understanding of how pressure affects water’s boiling point.
While there are many types of dimers, the research team focused exclusively on oxygen molecules, which are temporarily bound to each other through hydrogen bonding.

As the star’s light passes through a thin layer of the planet’s atmosphere the dimers absorb certain wavelengths of it. The team analyzed the likelihood of using the James Webb Space Telescope to make such a detection and found it challenging but possible. Oxygen is directly tied to photosynthesis, and will most likely not be abundant in an exoplanet’s atmosphere unless it is regularly produced by algae or other plants. Man of Steel et Batman V Superman, deux bandes-originales repetitives et peu memorables (meme avec Junkie XL venu a sa rescousse).
Meme qu’ils aimeraient que Charlize Theron, forte de sa prestation dans Mad Max Fury Road, endosse le role !
Once the starlight reaches Earth it’s imprinted with the chemical fingerprints of the dimers.
This difference is much more pronounced in dimers than in monomers, allowing astronomers to gain additional information about the atmospheric pressure based on the ratio of these two signatures.
Mais bon, n’oublions pas que maintenant que James Cameron est un maitre du monde assume depuis Titanic et Avatar, donc inutile de dire qu’il va prendre tout son temps !

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