Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

 
 
DownloadE-Mail
  Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko

Höfner, S., Vincent, J.-B., Blum, J., Davidsson, B. J. R., Sierks, H., El-Maarry, M. R., et al. (2017). Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 608: A121. doi:10.1051/0004-6361/201628726.

Item is

Basisdaten

einblenden: ausblenden:
Genre: Zeitschriftenartikel

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Höfner, Sebastian1, Autor           
Vincent, Jean-Baptiste1, Autor           
Blum, J., Autor
Davidsson, B. J. R., Autor
Sierks, Holger1, Autor           
El-Maarry, M. R., Autor
Deller, Jakob1, Autor           
Hofmann, M., Autor
Hu, X., Autor
Pajola, M., Autor
Barbieri, C., Autor
Lamy, P. L., Autor
Rodrigo, R., Autor
Koschny, D., Autor
Rickman, H., Autor
Keller, H. U., Autor
A’Hearn, M. F., Autor
Auger, A.-T., Autor
Barucci, M. A., Autor
Bertaux, J.-L., Autor
Bertini, I., AutorBodewits, D., AutorCremonese, G., AutorDeppo, V. Da, AutorDebei, S., AutorCecco, M. De, AutorFornasier, S., AutorFulle, M., AutorGicquel, A., AutorGroussin, O., AutorGutiérrez, P. J., AutorGutiérrez-Marqués, P., AutorGüttler, C., AutorHviid, S. F., AutorIp, W.-H., AutorJorda, L., AutorKnollenberg, J., AutorKovacs, G., AutorKramm, J.-R., AutorKührt, E., AutorKüppers, M., AutorLa Forgia, F., AutorLazzarin, M., AutorLopez-Moreno, J. J., AutorMarzari, F., AutorMichalik, H., AutorMoissl-Fraund, R., AutorMoreno, F., AutorMottola, S., AutorNaletto, G., AutorOklay, N., AutorPreusker, F., AutorScholten, F., AutorShi, Xian1, Autor           Thomas, N., AutorToth, I., AutorTubiana, Cecilia1, Autor           Zitzmann, S., Autor mehr..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 MPIS_GROUPS: Planets and Comets
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Zusammenfassung: Context. The camera OSIRIS on board Rosetta obtained high-resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko (67P). Great parts of the nucleus surface are composed of fractured terrain. Aims. Fracture formation, evolution, and their potential relationship to physical processes that drive activity are not yet fully understood. Observed temperatures and gas production rates can be explained or interpreted with the presence of fractures by applying appropriate modelling methods. Methods. We followed a transient thermophysical model approach that includes radiative, conductive, and water-ice sublimation fluxes by considering a variety of heliocentric distances, illumination conditions, and thermophysical properties for a set of characteristic fracture geometries on the nucleus of 67P. We computed diurnal temperatures, heat fluxes, and outgassing behaviour in order to derive and distinguish the influence of the mentioned parameters on fractured terrain. Results. Our analysis confirms that fractures, as already indicated by former studies about concavities, deviate from flat-terrain topographies with equivalent properties, mostly through the effect of self-heating. Compared to flat terrain, illuminated cometary fractures are generally warmer, with smaller diurnal temperature fluctuations. Maximum sublimation rates reach higher peaks, and dust mantle quenching effects on sublimation rates are weaker. Consequently, the rough structure of the fractured terrain leads to significantly higher inferred surface thermal inertia values than for flat areas with identical physical properties, which might explain the range of measured thermal inertia on 67P. Conclusions. At 3.5 AU heliocentric distance, sublimation heat sinks in fractures converge to maximum values >50 W / m2 and trigger dust activity that can be related mainly to H2O. Fractures are likely to grow through the erosive interplay of alternating sublimation and thermal fatigue.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 2018-01-092017
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1051/0004-6361/201628726
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Astronomy and Astrophysics
  Andere : Astron. Astrophys.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Berlin : Springer-Verlag
Seiten: - Band / Heft: 608 Artikelnummer: A121 Start- / Endseite: - Identifikator: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1