Zobrazeno 1 - 10
of 240
pro vyhledávání: '"Scherf, M."'
Autor:
Amerstorfer, U. V., Gröller, H., Lichtenegger, H., Lammer, H., Tian, F., Noack, L., Scherf, M., Johnstone, C., Tu, L., Güdel, M.
With a Monte Carlo model we investigate the escape of hot oxygen and carbon from the Martian atmosphere for four points in time in its history corresponding to 1, 3, 10, and 20 times the present solar EUV flux. We study and discuss different sources
Externí odkaz:
http://hdl.handle.net/10150/625483
http://arizona.openrepository.com/arizona/handle/10150/625483
http://arizona.openrepository.com/arizona/handle/10150/625483
Autor:
Erkaev, N., Scherf, M., Herbort, O., Lammer, H., Odert, P., Kubyshkina, D., Leitzinger, M., Woitke, P., O'Neill, C.
The initial abundance of radioactive heat producing isotopes in the interior of a terrestrial planet are important drivers of its thermal evolution and the related tectonics and possible evolution to an Earth-like habitat. The moderately volatile ele
Externí odkaz:
http://arxiv.org/abs/2209.14691
Autor:
Lammer, H., Scherf, M., Ito, Y., Mura, A., Vorburger, A., Guenther, E., Wurz, P., Erkaev, N. V., Odert, P.
In this review we discuss all the relevant solar/stellar radiation and plasma parameters and processes that act together in the formation and modification of atmospheres and exospheres that consist of surface-related minerals. Magma ocean degassed si
Externí odkaz:
http://arxiv.org/abs/2203.01656
Despite their importance for determining the evolution of the Earth's atmosphere and surface conditions, the evolutionary histories of the Earth's atmospheric CO$_2$ abundance during the Archean eon and the Sun's activity are poorly constrained. In t
Externí odkaz:
http://arxiv.org/abs/2109.01604
Autor:
Lichtenegger, H., Dyadechkin, S., Scherf, M., Lammer, H., Adam, R., Kallio, E., Amerstorfer, U. V., Jarvinen, R.
The ion escape of Mars' CO$_2$ atmosphere caused by its dissociation products C and O atoms is {simulated} from present time to $\sim 4.1$ billion years ago (Ga) by {numerical models of the upper atmosphere and its interaction with the solar wind}. T
Externí odkaz:
http://arxiv.org/abs/2105.09789
Publikováno v:
Space Sci Rev 217, 7 (2021)
We discuss the current state of knowledge of terrestrial planet formation from the aspects of different planet formation models and isotopic data from 182Hf-182W, U-Pb, lithophile-siderophile elements, 48Ca/44Ca isotope samples from planetary buildin
Externí odkaz:
http://arxiv.org/abs/2102.06173
Autor:
Scherf, M., Lammer, H.
Publikováno v:
Space Sci Rev 217, 2 (2021)
It is not yet entirely clear whether Mars began as a warm and wet planet that evolved towards the present-day cold and dry body or if it always was cold and dry with just some sporadic episodes of liquid water on its surface. An important clue into t
Externí odkaz:
http://arxiv.org/abs/2102.05976
Autor:
Lammer, H., Scherf, M., Kurokawa, H., Ueno, Y., Burger, C., Maindl, T., Johnstone, C. P., Leitzinger, M., Benedikt, M., Fossati, L., Kislyakova, K. G., Marty, B., Avice, G., Fegley, B., Odert, P.
Publikováno v:
Space Sci Rev 216, 74 (2020)
Here we discuss the current state of knowledge on how atmospheric escape processes can fractionate noble gas isotopes and moderately volatile rock-forming elements that populate primordial atmospheres, magma ocean related environments, and catastroph
Externí odkaz:
http://arxiv.org/abs/2011.01064
Publikováno v:
Space Sci Rev 216, 123 (2020)
This brief review will discuss the current knowledge on the origin and evolution of the nitrogen atmospheres of the icy bodies in the solar system, particularly of Titan, Triton and Pluto. An important tool to analyse and understand the origin and ev
Externí odkaz:
http://arxiv.org/abs/2011.00973
Autor:
Erkaev, N. V., Scherf, M., Thaller, S. E., Lammer, H., Mezentsev, A. V., Ivanov, V. A., Mandt, K. E.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2020, staa3151
We apply a 1D upper atmosphere model to study thermal escape of nitrogen over Titan's history. Significant thermal escape should have occurred very early for solar EUV fluxes 100 to 400 times higher than today with escape rates as high as $\approx 1.
Externí odkaz:
http://arxiv.org/abs/2010.12342