Zobrazeno 1 - 10
of 3 338
pro vyhledávání: '"Janusz, J"'
Autor:
Duzdevich, Daniel, Nisler, Collin, Petkowski, Janusz J., Bains, William, Kaminsky, Caroline K., Szostak, Jack W., Seager, Sara
Venus has become a target of astrobiological interest because it is physically accessible to direct exploration, unlike exoplanets. So far this interest has been motivated not by the explicit expectation of finding life, but rather a desire to unders
Externí odkaz:
http://arxiv.org/abs/2409.12982
Publikováno v:
Life 2023, 13(12), 2325
Isotopologue ratios are anticipated to be one of the most promising signs of life that can be observed remotely. On Earth, carbon isotopes have been used for decades as evidence of modern and early metabolic processes. In fact, carbon isotopes may be
Externí odkaz:
http://arxiv.org/abs/2401.15153
Life is a complex, dynamic chemical system that requires a dense fluid solvent in which to take place. A common assumption is that the most likely solvent for life is liquid water, and some researchers argue that water is the only plausible solvent.
Externí odkaz:
http://arxiv.org/abs/2401.07296
Autor:
Petkowski, Janusz J., Seager, Sara, Grinspoon, David H., Bains, William, Ranjan, Sukrit, Rimmer, Paul B., Buchanan, Weston P., Agrawal, Rachana, Mogul, Rakesh, Carr, Christopher E.
Long-standing unexplained Venus atmosphere observations and chemical anomalies point to unknown chemistry but also leave room for the possibility of life. The unexplained observations include several gases out of thermodynamic equilibrium (e.g. tens
Externí odkaz:
http://arxiv.org/abs/2401.04708
Scientists have long speculated about the potential habitability of Venus, not at the 700K surface, but in the cloud layers located at 48-60 km altitudes, where temperatures match those found on Earth's surface. However, the prevailing belief has bee
Externí odkaz:
http://arxiv.org/abs/2401.01441
Autor:
Iaroslav Iakubivskyi, Sara Seager, Christopher E. Carr, Janusz J. Petkowski, Rachana Agrawal, M. Regina A. Moreno, Snigdha Nellutla
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-16 (2024)
Abstract We report on the proof-of-concept of a low-mass, low-power method for collecting micron-sized sulfuric acid aerosols in bulk from the atmosphere of Venus. The collection method uses four wired meshes in a sandwich structure with a deposition
Externí odkaz:
https://doaj.org/article/dd5ec8416ab34b5b8d675a09d09293c4
Autor:
Triaud, Amaury H. M. J., de Wit, Julien, Klein, Frieder, Turbet, Martin, Rackham, Benjamin V., Niraula, Prajwal, Glidden, Ana, Jagoutz, Oliver E., Pec, Matej, Petkowski, Janusz J., Seager, Sara, Selsis, Franck
Publikováno v:
Nat Astron (2023)
The conventional observables to identify a habitable or inhabited environment in exoplanets, such as an ocean glint or abundant atmospheric O$_2$, will be challenging to detect with present or upcoming observatories. Here we suggest a new signature.
Externí odkaz:
http://arxiv.org/abs/2310.14987
Autor:
Seager, Sara, Petkowski, Janusz J., Huang, Jingcheng, Zhan, Zhuchang, Ravela, Sai, Bains, William
Publikováno v:
Scientific Reports 13.1 (2023): 13576
Waste gas products from technological civilizations may accumulate in an exoplanet atmosphere to detectable levels. We propose nitrogen trifluoride (NF3) and sulfur hexafluoride (SF6) as ideal technosignature gases. Earth life avoids producing or usi
Externí odkaz:
http://arxiv.org/abs/2308.13667
Autor:
Seager, Sara, Petkowski, Janusz J., Seager, Maxwell D., Grimes Jr., John H., Zinsli, Zachary, Vollmer-Snarr, Heidi R., El-Rahman, Mohamed K. Abd, Wishart, David S., Lee, Brian L., Gautam, Vasuk, Herrington, Lauren, Bains, William, Darrow, Charles
Publikováno v:
PNAS, June 12, 2023, 120 (25) e2220007120
What constitutes a habitable planet is a frontier to be explored and requires pushing the boundaries of our terracentric viewpoint for what we deem to be a habitable environment. Despite Venus' 700 K surface temperature being too hot for any plausibl
Externí odkaz:
http://arxiv.org/abs/2306.17182
Venus is Earth's sister planet, with similar mass and density but an uninhabitably hot surface, an atmosphere with a water activity 50-100 times lower than anywhere on Earths' surface, and clouds believed to be made of concentrated sulfuric acid. The
Externí odkaz:
http://arxiv.org/abs/2306.07358