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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. ISSN 0035-8711

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Official URL: http://dx.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 AuthorsAuthors ORCID iD
Fornasier, S.observatoire de paris meudon, franceUNSPECIFIED
Feller, C.lesia, observatoire de paris, cnrs, upmc univ paris 06, univ. paris-diderot, 5 place j. janssen, 92195 meudon pricipal cedex, franceUNSPECIFIED
Lee, J.C.dept. of earth science, national central university, chung-li 32054, taiwanUNSPECIFIED
Ferrari, Sabrinasabrina.ferrari (at) dlr.deUNSPECIFIED
Massironi, M.university of padova, italyUNSPECIFIED
Hasselmann, P. H.lesia, observatoire de paris, cnrs, upmc univ paris 06, univ. paris-diderot, 5 place j. janssen, 92195 meudon pricipal cedex, franceUNSPECIFIED
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.UNSPECIFIED
Barucci, M. A.observatoire de paris, meudon, franceUNSPECIFIED
El Maarry, M. R.physikalisches institut, sidlerstrasse 5, university of bern, ch-3012 bern, switzerlandUNSPECIFIED
Giacomini, L.university of padovaUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
IP, W.-H.nationa central univ., institute of astronomy, chung-li, taiwanUNSPECIFIED
Lin, Z.-Y.national central university, jhongli, taoyuan, taiwanUNSPECIFIED
Sierks, H.max planck institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIED
Barbieri, C.university of padova, padova, italyUNSPECIFIED
Lamy, P. L.aix marseille universite, cnrs, lamUNSPECIFIED
Rodrigo, R.instituto de astrofísica de andalucía csic, granada, spainUNSPECIFIED
Koschny, D.detlef.koschny (at) esa.intUNSPECIFIED
Rickman, H.department of physics and astronomy, uppsala university, 75120 uppsala, swedenUNSPECIFIED
Agarwal, J.max planck institut für sonnensystemforschungUNSPECIFIED
A'Hearn, M. F.university of maryland, department of astronomy, maryland, usaUNSPECIFIED
Bertaux, J.L.laboratoire atmosphères, milieux, observations spatiales, cnrs/uvsq/upmc, 11 boulevard d’alembert, 78280 guyancourt, franceUNSPECIFIED
Bertini, I.dipartimento di astronomia, università di padova, padova, italyUNSPECIFIED
Cremonese, G.osservatorio astronomico, padova, italyUNSPECIFIED
Da Deppo, V.consiglio nazionale delle ricerche-istituto nazionale per la fisica della materia, luxor, padova, italyUNSPECIFIED
Davidsson, B.astronomiska observatoriet, uppsala, swedenUNSPECIFIED
Debei, S.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIED
De Cecco, M.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIED
Deller, J.mpsUNSPECIFIED
Fulle, M.inaf obsservatorio astronomico di trieste, trieste, italyUNSPECIFIED
Groussin, O.laboratoire d'astrophysique de marseille, franceUNSPECIFIED
Gutierrez, P. J.instituto de astrofísica de andalucía csic, granada, spainUNSPECIFIED
Güttler, C.max planck institut für sonnensystemforschungUNSPECIFIED
Hofmann, M.max planck institut für sonnensystemforschung, göttingen, germanyUNSPECIFIED
Hviid, S. F.max planck institut fuer sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIED
Jorda, L.laboratoire d'astrophysique de marseille, franceUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kovacs, G.max planck institut für sonnensystemforschung, justus–von–UNSPECIFIED
Kramm, R.max planck institut für aeronomie, katlenburg-lindauUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Küppers, M.esa/esac, po box 78, 28691 villanueva de la cañada, spainUNSPECIFIED
Lara, M. L.Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de la Astronomía s/n, 18008 Granada, Spain.UNSPECIFIED
Lazzarin, M.department of astronomy, university of paduaUNSPECIFIED
Lopez Moreno, J. J.instituto de astrofísica de andalucía, granada, spainUNSPECIFIED
Marzari, F.università di padova, departimento di fisica, padova, italyUNSPECIFIED
Naletto, G.università di padova, departimento di elettronica et informatica, padova, italyUNSPECIFIED
Oklay, NildaNilda.OklayVincent (at) dlr.dehttps://orcid.org/0000-0002-4909-9692
Pajola, M.cisas, center for studies and activities for space, university of padovaUNSPECIFIED
Shi, X.technical university berlin, germany ; shanghai astronomical observatory, shanghai, china,UNSPECIFIED
Thomas, N.max planck institut für aeronomie, katlenburg-lindauUNSPECIFIED
Toth, I.konkoly observatory, mta csfk csiUNSPECIFIED
Tubiana, C.max planck institut fuer sonnensystemforschung, germanyUNSPECIFIED
Vincent, J.B.jean-baptiste.vincent (at) dlr.deUNSPECIFIED
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
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 Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente, R - Projekt ROSETTA Lander, R - Projekt PROSIRIS
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:06 Sep 2019 15:17

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