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The highly active Anhur Bes regions in the 67P/ChuryumovGerasimenko comet: results from OSIRIS/ROSETTA observations

Fornasier, S. and Feller, C. and Lee, J.C. and Ferrari, Sabrina and Massironi, M. and Hasselmann, P. H. and Deshaphiya, J. D. P. and Barucci, M. A. and El Maarry, M. R. and Giacomini, L. and Mottola, S. and Keller, H. U. and IP, W.-H. and Lin, Z.-Y. and Sierks, H. and Barbieri, C. and Lamy, P. L. and Rodrigo, R. and Koschny, D. and Rickman, H. and Agarwal, J. and A'Hearn, M. F. and Bertaux, J.L. and Bertini, I. and Cremonese, G. and Da Deppo, V. and Davidsson, B. and Debei, S. and De Cecco, M. and Deller, J. and Fulle, M. and Groussin, O. and Gutierrez, P. J. and Güttler, C. and Hofmann, M. and Hviid, S. F. and Jorda, L. and Knollenberg, J. and Kovacs, G. and Kramm, R. and Kührt, E. and Küppers, M. and Lara, M. L. and Lazzarin, M. and Lopez Moreno, J. J. and Marzari, F. and Naletto, G. and Oklay, Nilda and Pajola, M. and Shi, X. and Thomas, N. and Toth, I. and Tubiana, C. and Vincent, J.B. (2017) The highly active Anhur Bes regions in the 67P/ChuryumovGerasimenko comet: results from OSIRIS/ROSETTA observations. Monthly Notices of the Royal Astronomical Society, 469 (Suppl_), S93-S107. Oxford University Press. doi: 10.1093/mnras/stx1275. ISSN 0035-8711.

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Official URL: https://doi.org/10.1093/mnras/stx1275

Abstract

The Southern hemisphere of the 67P/Churyumov-Gerasimenko comet has become visible from Rosetta only since March 2015. It was illuminated during the perihelion passage and therefore it contains the regions that experienced the strongest heating and erosion rate, thus exposing the subsurface 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 CO$_2$ and H$_2$O 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.

Item URL in elib:https://elib.dlr.de/113285/
Document Type:Article
Title:The highly active Anhur Bes regions in the 67P/ChuryumovGerasimenko comet: results from OSIRIS/ROSETTA observations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Fornasier, S.observatoire de paris meudon, franceUNSPECIFIEDUNSPECIFIED
Feller, C.lesia, observatoire de paris, cnrs, upmc univ paris 06, univ. paris-diderot, 5 place j. janssen, 92195 meudon pricipal cedex, franceUNSPECIFIEDUNSPECIFIED
Lee, J.C.dept. of earth science, national central university, chung-li 32054, taiwanUNSPECIFIEDUNSPECIFIED
Ferrari, SabrinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Massironi, M.university of padova, italyUNSPECIFIEDUNSPECIFIED
Hasselmann, P. H.lesia, observatoire de paris, cnrs, upmc univ paris 06, univ. paris-diderot, 5 place j. janssen, 92195 meudon pricipal cedex, franceUNSPECIFIEDUNSPECIFIED
Deshaphiya, J. D. P.LESIA, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités, Meudon Principal Cedex 92195, France.UNSPECIFIEDUNSPECIFIED
Barucci, M. A.observatoire de paris, meudon, franceUNSPECIFIEDUNSPECIFIED
El Maarry, M. R.physikalisches institut, sidlerstrasse 5, university of bern, ch-3012 bern, switzerlandUNSPECIFIEDUNSPECIFIED
Giacomini, L.university of padovaUNSPECIFIEDUNSPECIFIED
Mottola, S.UNSPECIFIEDhttps://orcid.org/0000-0002-0457-3872UNSPECIFIED
Keller, H. U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
IP, W.-H.nationa central univ., institute of astronomy, chung-li, taiwanUNSPECIFIEDUNSPECIFIED
Lin, Z.-Y.national central university, jhongli, taoyuan, taiwanUNSPECIFIEDUNSPECIFIED
Sierks, H.max planck institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIEDUNSPECIFIED
Barbieri, C.university of padova, padova, italyUNSPECIFIEDUNSPECIFIED
Lamy, P. L.aix marseille universite, cnrs, lamUNSPECIFIEDUNSPECIFIED
Rodrigo, R.instituto de astrofísica de andalucía csic, granada, spainUNSPECIFIEDUNSPECIFIED
Koschny, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rickman, H.department of physics and astronomy, uppsala university, 75120 uppsala, swedenUNSPECIFIEDUNSPECIFIED
Agarwal, J.max planck institut für sonnensystemforschungUNSPECIFIEDUNSPECIFIED
A'Hearn, M. F.university of maryland, department of astronomy, maryland, usaUNSPECIFIEDUNSPECIFIED
Bertaux, J.L.laboratoire atmosphères, milieux, observations spatiales, cnrs/uvsq/upmc, 11 boulevard d’alembert, 78280 guyancourt, franceUNSPECIFIEDUNSPECIFIED
Bertini, I.dipartimento di astronomia, università di padova, padova, italyUNSPECIFIEDUNSPECIFIED
Cremonese, G.osservatorio astronomico, padova, italyUNSPECIFIEDUNSPECIFIED
Da Deppo, V.consiglio nazionale delle ricerche-istituto nazionale per la fisica della materia, luxor, padova, italyUNSPECIFIEDUNSPECIFIED
Davidsson, B.astronomiska observatoriet, uppsala, swedenUNSPECIFIEDUNSPECIFIED
Debei, S.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIEDUNSPECIFIED
De Cecco, M.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIEDUNSPECIFIED
Deller, J.mpsUNSPECIFIEDUNSPECIFIED
Fulle, M.inaf obsservatorio astronomico di trieste, trieste, italyUNSPECIFIEDUNSPECIFIED
Groussin, O.laboratoire d'astrophysique de marseille, franceUNSPECIFIEDUNSPECIFIED
Gutierrez, P. J.instituto de astrofísica de andalucía csic, granada, spainUNSPECIFIEDUNSPECIFIED
Güttler, C.max planck institut für sonnensystemforschungUNSPECIFIEDUNSPECIFIED
Hofmann, M.max planck institut für sonnensystemforschung, göttingen, germanyUNSPECIFIEDUNSPECIFIED
Hviid, S. F.max planck institut fuer sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIEDUNSPECIFIED
Jorda, L.laboratoire d'astrophysique de marseille, franceUNSPECIFIEDUNSPECIFIED
Knollenberg, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kovacs, G.max planck institut für sonnensystemforschung, justus–von–UNSPECIFIEDUNSPECIFIED
Kramm, R.max planck institut für aeronomie, katlenburg-lindauUNSPECIFIEDUNSPECIFIED
Kührt, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Küppers, M.esa/esac, po box 78, 28691 villanueva de la cañada, spainUNSPECIFIEDUNSPECIFIED
Lara, M. L.Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de la Astronomía s/n, 18008 Granada, Spain.UNSPECIFIEDUNSPECIFIED
Lazzarin, M.department of astronomy, university of paduaUNSPECIFIEDUNSPECIFIED
Lopez Moreno, J. J.instituto de astrofísica de andalucía, granada, spainUNSPECIFIEDUNSPECIFIED
Marzari, F.università di padova, departimento di fisica, padova, italyUNSPECIFIEDUNSPECIFIED
Naletto, G.università di padova, departimento di elettronica et informatica, padova, italyUNSPECIFIEDUNSPECIFIED
Oklay, NildaUNSPECIFIEDhttps://orcid.org/0000-0002-4909-9692UNSPECIFIED
Pajola, M.cisas, center for studies and activities for space, university of padovaUNSPECIFIEDUNSPECIFIED
Shi, X.technical university berlin, germany ; shanghai astronomical observatory, shanghai, china,UNSPECIFIEDUNSPECIFIED
Thomas, N.max planck institut für aeronomie, katlenburg-lindauUNSPECIFIEDUNSPECIFIED
Toth, I.konkoly observatory, mta csfk csiUNSPECIFIEDUNSPECIFIED
Tubiana, C.max planck institut fuer sonnensystemforschung, germanyUNSPECIFIEDUNSPECIFIED
Vincent, J.B.UNSPECIFIEDhttps://orcid.org/0000-0001-6575-3079136814523
Date:2017
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:469
DOI:10.1093/mnras/stx1275
Page Range:S93-S107
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:67P/Churyumov-Gerasimenko;OSIRIS;
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments (old), R - Projekt ROSETTA Lander (old), R - Projekt PROSIRIS (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Schubert, Renate
Deposited On:20 Sep 2017 10:45
Last Modified:13 Jun 2023 14:14

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