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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 AuthorsAuthor's ORCID iDORCID Put Code
Ermakov, A.mass. inst. of technology, cambridge, ma, united states.UNSPECIFIEDUNSPECIFIED
Mazarico, E.nasa goddard space flight center, greenbelt, md 20771, usaUNSPECIFIEDUNSPECIFIED
Schröder, StefanUNSPECIFIEDhttps://orcid.org/0000-0003-0323-8324UNSPECIFIED
Schorghofer, N.university of hawaii at manoaUNSPECIFIEDUNSPECIFIED
Raymond, C.A.jet propulsion laboratory, california institute of technology, pasadena, ca 91109-8099, usaUNSPECIFIEDUNSPECIFIED
Russell, C.T.institute of geophysics, university of california, los angeles, los angeles, ca 90095UNSPECIFIEDUNSPECIFIED
Zuber, Maria T.department of earth, atmospheric, and planetary sciences, massachusetts institute of technology, cambridge, ma 02139-4307, usaUNSPECIFIEDUNSPECIFIED
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
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 DAWN (old)
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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