NDLI: On the thermal history of Saturn’s satellites Titan and Enceladus

Content Provider	Springer Nature Link
Author	Dorofeeva, V. A. Ruskol, E. L.
Copyright Year	2010
Abstract	The thermal histories of two geologically active satellites of Saturn—Titan and Enceladus—are discussed. During the Cassini mission, it was found that there are both nitrogen-containing compounds—NH$_{3}$ and N$_{2}$-and CO$_{2}$ and CH$_{4}$ in the water plumes of Enceladus; at that, ammonia is the prevailing form. This may testify that during evolution, the material of the satellite was warmed up to T ∼ 500–600 K, when NH$_{3}$ (the form of nitrogen capable of being accreted) could only be partly converted into N$_{2}$. Contrary to Enceladus, the temperature inside Titan probably reached values higher than 800 K or even higher than 1000 K, since the process of the chemical dissociation of ammonia was completely finished on this satellite and its atmosphere contains only molecular nitrogen. While the internal heating of Titan up to high temperatures can be explained by its large mass, the heating source for Enceladus’ interior is far from evident. Such traditional heating sources as the energy of gravitational differentiation and the radiogenic heating due to shortliving $^{26}$Al and $^{60}$Fe could not be effective. The first one is because of the small size of Enceladus (RE ≈ 250 km), and the inefficiency of the second one is caused by the fact that the satellite was formed not earlier than 8–10 Myr after the formation of calcium and aluminum-enriched inclusions in carbonaceous chondrites (CAI), i.e., after $^{26}$Al had completely decayed. In the present paper, we propose other heating mechanisms-the heat of long-living radioactive elements and tidal heat, which could provide the observed chemical composition of the water plumes of Enceladus rather than only the differentiation of its protomatter into the ironstone core and the ice mantle.
Starting Page	192
Ending Page	201
Page Count	10
File Format	PDF
ISSN	00380946
Journal	Solar System Research
Volume Number	44
Issue Number	3
e-ISSN	16083423
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2010-06-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics and Astroparticles Astronomy, Observations and Techniques Planetology Astronomy, Astrophysics and Cosmology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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