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Ceres's obliquity history and its implications for the permanently shadowed regions

Ermakov, A. and Mazarico, E. and Schröder, Stefan and Carsenty, Uri and Schorghofer, N. and Preusker, Frank and Raymond, C.A. and Russell, C.T. and Zuber, Maria T. (2017) Ceres's obliquity history and its implications for the permanently shadowed regions. Geophysical Research Letters. Wiley. DOI: 10.1002/2016GL072250 ISSN 0094-8276

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2016GL072250/abstract;jsessionid=A36085D71B23BB660732E857A4FD57CC.f02t03


Due to the small current obliquity of Ceres (ε≈4°), permanently shadowed regions (PSRs) exist on the dwarf planet's surface. Since the existence and persistence of the PSRs depend on the obliquity, we compute the obliquity history over the last 3 Myr and find that it undergoes large oscillations with a period of 24.5 kyr and a maximum of εmax≈19.6°. During periods of large obliquity, most of the present-day PSRs receive direct sunlight. Some craters in Ceres's polar regions possess bright crater floor deposits (BCFDs). We find an apparent correlation between BCFDs and the most persistent PSRs. In the north, only two PSRs remain at εmax and they both contain BCFDs. In the south, one of the two only craters that remain in shadow at εmax contains a BCFD. The location of BCFDs within persistent PSRs strongly suggests that BCFDs consist of volatiles accumulated in PSR cold traps: either water molecules trapped from the exosphere or exposed ground ice.

Item URL in elib:https://elib.dlr.de/111696/
Document Type:Article
Title:Ceres's obliquity history and its implications for the permanently shadowed regions
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ermakov, A.mass. inst. of technology, cambridge, ma, united states.UNSPECIFIED
Mazarico, E.nasa goddard space flight center, greenbelt, md 20771, usaUNSPECIFIED
Schröder, Stefanstefanus.schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Carsenty, UriUri.Carsenty (at) dlr.deUNSPECIFIED
Schorghofer, N.university of hawaii at manoaUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Raymond, C.A.jet propulsion laboratory, california institute of technology, pasadena, ca 91109-8099, usaUNSPECIFIED
Russell, C.T.institute of geophysics, university of california, los angeles, los angeles, ca 90095UNSPECIFIED
Zuber, Maria T.department of earth, atmospheric, and planetary sciences, massachusetts institute of technology, cambridge, ma 02139-4307, usaUNSPECIFIED
Date:22 March 2017
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1002/2016GL072250
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 DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Planetary Geodesy
Deposited By: Schröder, Dr. Stefan
Deposited On:11 Apr 2017 12:55
Last Modified:31 Jul 2019 20:08

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