Logo: to the web site of Uppsala University

uu.sePublikasjoner fra Uppsala universitet
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
The highly active Anhur-Bes regions in the 67P/Churyumov-Gerasimenko comet: results from OSIRIS/ROSETTA observations
Sorbonne Univ, UPMC Univ Paris 06, Univ Paris Diderot, PSL Res Univ,Sorbonne Paris Cite,Observ Paris,LES, 5 Pl J Janssen, F-92195 Meudon, France.
Sorbonne Univ, UPMC Univ Paris 06, Univ Paris Diderot, PSL Res Univ,Sorbonne Paris Cite,Observ Paris,LES, 5 Pl J Janssen, F-92195 Meudon, France.
Univ Padua, Dipartimento Geosci, Via G Gradenigo 6, I-35131 Padua, Italy.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469, s. S93-S107Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The Southern hemisphere of the 67P/Churyumov-Gerasimenko comet has become visible from Rosetta only since 2015 March. It was illuminated during the perihelion passage and therefore it contains the regions that experienced the strongest heating and erosion rates, thus exposing the sub-surface most pristine material. In this work we investigate, thanks to the OSIRIS images, the geomorphology, the spectrophotometry and some transient events of two Southern hemisphere regions: Anhur and part of Bes. Bes is dominated by outcropping consolidated terrain covered with fine particle deposits, while Anhur appears strongly eroded with elongated canyon-like structures, scarp retreats, different kinds of deposits and degraded sequences of strata indicating a pervasive layering. We discovered a new 140 m long and 10 m high scarp formed in the Anhur-Bes boundary during/after the perihelion passage, close to the area where exposed CO2 and H2O ices were previously detected. Several jets have been observed originating from these regions, including the strong perihelion outburst, an active pit and a faint optically thick dust plume. We identify several areas with a relatively bluer slope (i.e. a lower spectral slope value) than their surroundings, indicating a surface composition enriched with some water ice. These spectrally bluer areas are observed especially in talus and gravitational accumulation deposits where freshly exposed material had fallen from nearby scarps and cliffs. The investigated regions become spectrally redder beyond 2 au outbound when the dust mantle became thicker, masking the underlying ice-rich layers.

sted, utgiver, år, opplag, sider
OXFORD UNIV PRESS , 2017. Vol. 469, s. S93-S107
Emneord [en]
methods: data analysis, methods: observational, techniques: photometric, comets: individual: 67P/Churyumov-Gerasimenko
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-376684DOI: 10.1093/mnras/stx1275ISI: 000443940500010OAI: oai:DiVA.org:uu-376684DiVA, id: diva2:1289162
Konferanse
International Conference on Cometary Science - Comets - A New Vision after Rosetta and Philae, NOV 14-18, 2016, Toulouse, FRANCE
Tilgjengelig fra: 2019-02-15 Laget: 2019-02-15 Sist oppdatert: 2019-02-15bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekst

Person

Rickman, Hans

Søk i DiVA

Av forfatter/redaktør
Rickman, Hans
Av organisasjonen
I samme tidsskrift
Monthly notices of the Royal Astronomical Society

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 11 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf