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pro vyhledávání: '"Attree, Nicholas"'
We extend an existing thermophysical activity model of comet 67P/Churyumov-Gerasimenko to include pressure buildup inside the pebbles making up the nucleus. We test various quantities of H$_{2}$O and CO$_{2}$, in order to simulate the material inside
Externí odkaz:
http://arxiv.org/abs/2410.03251
Autor:
Manghi, Riccardo Lasagni, Zannoni, Marco, Tortora, Paolo, Budnik, Frank, Godard, Bernard, Attree, Nicholas
This study provides a continuous ephemeris reconstruction for comet 67P/Churyumov-Gerasimenko by reanalyzing Rosetta radiometric measurements and Earth-based astrometry. Given the comet-to-spacecraft relative trajectory provided by the navigation tea
Externí odkaz:
http://arxiv.org/abs/2407.17615
The mechanism of dust emission from a cometary nucleus is still an open question and thermophysical models have problems reproducing outgassing and dust productions rates simultaneously. In this study, we investigate the capabilities of a rather simp
Externí odkaz:
http://arxiv.org/abs/2306.07057
Autor:
Attree, Nicholas, Jorda, Laurent, Groussin, Olivier, Agarwal, Jessica, Manghi, Riccardo Lasagni, Tortora, Paolo, Zannoni, Marco, Marschall, Raphael
Publikováno v:
A&A 670, A170 (2023)
Aims. Understanding the activity is vital for deciphering the structure, formation, and evolution of comets. We investigate models of cometary activity by comparing them to the dynamics of 67P/Churyumov-Gerasimenko. Methods. We matched simple thermal
Externí odkaz:
http://arxiv.org/abs/2301.04892
Martian araneiform terrain, located in the Southern polar regions, consists of features with central pits and radial troughs which are thought to be associated with the solid state greenhouse effect under a CO$_{2}$ ice sheet. Sublimation at the base
Externí odkaz:
http://arxiv.org/abs/2101.12641
Autor:
Attree, Nicholas, Patel, Narissa, Hagermann, Axel, Grott, Matthias, Spohn, Tilman, Siegler, Matthew
Heat flow is an important constraint on planetary formation and evolution. It has been suggested that Martian obliquity cycles might cause periodic collapses in atmospheric pressure, leading to corresponding decreases in regolith thermal conductivity
Externí odkaz:
http://arxiv.org/abs/1910.04520
Autor:
Attree, Nicholas, Jorda, Laurent, Groussin, Olivier, Mottola, Stefano, Thomas, Nick, Brouet, Yann, Kührt, Ekkehard, Knapmeyer, Martin, Preusker, Frank, Scholten, Frank, Knollenberg, Jorg, Hviid, Stubbe, Hartogh, Paul, Rodrigo, Rafael
Publikováno v:
A&A 630, A18 (2019)
Aims. We use four observational data sets, mainly from the Rosetta mission, to constrain the activity pattern of the nucleus of comet 67P/Churyumov-Gerasimenko. Methods. We develop a numerical model that computes the production rate and non-gravitati
Externí odkaz:
http://arxiv.org/abs/1901.02806
Akademický článek
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Publikováno v:
Icarus (2014), pp. 56-66
Small (~50km scale), irregular features seen in Cassini images to be emanating from Saturn's F ring have been termed mini-jets by Attree et al. (2012). One particular mini-jet was tracked over half an orbital period, revealing its evolution with time
Externí odkaz:
http://arxiv.org/abs/1309.3119
Autor:
Becker, Tracy M., Colwell, Joshua E., Esposito, Larry W., Attree, Nicholas O., Murray, Carl D.
Publikováno v:
In Icarus 15 May 2018 306:171-199
