Abstract
Enceladus is one of the most remarkable satellites in the solar system, as revealed by Cassini's detection of active plumes erupting from warm fractures near its south pole. This discovery makes Enceladus the only icy satellite known to exhibit ongoing internally driven geological activity. The activity is presumably powered by tidal heating maintained by Enceladus' 2:1 mean-motion resonance with Dione, but many questions remain. For instance, it appears difficult or impossible to maintain the currently observed radiated power (probably at least 6 GW) in steady state. It is also not clear how Enceladus first entered its current self-maintaining warm and dissipative state- initial heating from non-tidal sources is probably required. There are also many unanswered questions about Enceladus' interior. The silicate fraction inferred from its density of 1:68gcm−2 is probably differentiated into a core, though we have not direct evidence for differentiation. Above the core there is probably a global or regional liquid water layer, inferred from several models of tidal heating, and an ice shell thick enough to support the ~1 km amplitude topography seen on Enceladus. It is possible that dissipation is largely localized beneath the south polar region. Enceladus' surface geology, ranging from moderately cratered terrain to the virtually crater-free active south polar region, is highly diverse, tectonically complex, and remarkably symmetrical about the rotation axis and the direction to Saturn. South polar activity is concentrated along the four “tiger stripe” fractures, which radiate heat at temperatures up to at least 167K and are the source of multiple plumes ejecting ~200kgs−2 of H2O vapor along with significant N2 (or C2H4), CO2, CH4, NH3, and higher-mass hydrocarbons. The escaping gas maintains Saturn's neutral gas torus, and the plumes also eject a large number of micron-sized H2O ice grains that populate Saturn's E-ring. The mechanism that powers the plumes is not well understood, and whether liquid water is involved is a subject of active debate. Enceladus provides perhaps the most promising potential habitat for life in the outer solar system, and the active plumes allow the unique opportunity for direct sampling of that zone. Enceladus is thus a prime target for Cassini's continued exploration of the Saturn system, and will be a tempting target for future missions.
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References
Abramov, O., Spencer J.R.: Endogenic heat from Enceladus' south polar fractures: New observations, and models of conductive surface heating. Icarus 199, 189–196 (2009).
Anderson, D.L.: Theory of the Earth. Blackwell, London (1989).
Barr, A.C., McKinnon, W.B.: Convection in Enceladus' ice shell: Conditions for initiation. Geophys. Res. Lett. 34, L09202. (2007a).
Barr, A.C., McKinnon, W.B.: Convection in ice I shells and mantles with self-consistent grain size, J. Geophys. Res. 112, E02012 (2007b). doi: 10.1029/2006JE002781.
Barr, A.C.: Mobile lid convection beneath Enceladus' south polar terrain, J. Geophys. Res. 113, E07009 (2008). doi: 10.1029/2008JE003114.
Baum, W.A., Kreidl, T., Westphal, J.A., Danielson, G.E., Seidelmann, P.K., Pascu, D., Currie, D.G.: Saturn's E ring. Icarus 47, 84–96 (1981).
Benjamin, D., Wahr, J., Ray, R.D., Egbert, G.D. Desai, S.D.: Constraints on mantle anelasticity from geodetic observations, and implications for the J(2) anomaly, Geophys. J. Int. 165, 3–16 (2006).
Bills, B.G.: Free and forced obliquities of the Galilean satellites of Jupiter. Icarus 175, 233–247 (2005).
Bills, B.G. Nimmo, F.: Forced obliquity and moments of inertia of Titan. Icarus 196, 293–297 (2008).
Bills, B.G., Nimmo F., Karatekin O., Van Hoolst, T., Rambaux, N, Levrard B., Laskar, J.: Rotational dynamics of Europa. In: Pappalardo, R., McKinnon, W. Khurana, K (eds.) Europa, Univ. Ariz. Press., Tucson, in press (2009).
Bland, M.T., Beyer R.A., Showman A.P: Unstable extension of Enceladus' lithosphere. Icarus 192, 92–105 (2007).
Brilliantov, N.V., Schmidt, J., Spahn, F.: Geysers of Enceladus: Quantitative analysis of qualitative models. Planet. Space Sci. 56, 1596–1606 (2008).
Brown, R.H. and 24 co-authors: Composition and physical properties of Enceladus' surface. Science 311, 1425–1428 (2006).
Buratti, B. J.: Enceladus — Implications of its unusual photometric properties. Icarus 75, 113–126 (1988).
Buratti, B., Veverka, J.: Voyager photometry of Rhea, Dione, Tethys, Enceladus and Mimas. Icarus 58, 254–264 (1984).
Buratti, B.J., Mosher, J.A., Nicholson, P.D., McGhee, C.A., French, R.G.: Near-infrared photometry of the Saturnian satellites during ring plane crossing. Icarus 136, 223–231 (1998).
Chapelle, F.H., O'Neill K., Bradley P.M., Methe B.A., Ciufo S.A., Knobel L.L., Lovley D.R.: A hydrogen-based subsurface microbial community dominated by methanogens. Nature 415, 312–315 (2002).
Chyba, C.F., Phillips, C.B.: Possible ecosystems and the search for life on Europa. Proc. Natl Acad. Sci. 98, 801–804 (2001).
Clark, R.N.: Water frost and ice: The near-infrared spectral reflectance 0:65–2:5 μm. J. Geophys. Res. 86, 3087–3096 (1981).
Clark, R.N., Lucey, P.G.: Spectral properties of ice-particulate mixtures and implications for remote sensing. I. Intimate mixtures. J. Geophys. Res. 89, 6341–6348 (1984).
Collins, G.C., Goodman, J.C.: Enceladus' south polar sea Icarus 189, 72–82 (2007).
Corliss, J.B., Baross, J.A., Hoffman, S.E.: An hypothesis concern-ing_the relationship between submarine hot springs and the origin of life. Oceanologica Acta 4. suppl. C4, 59–69 (1981).
Coustenis, A. and 155 co-authors: TandEM: Titan and Enceladus mission. Exper. Astron. 23(2008). doi: 10.1007/s10686–008-9103-z
Cruikshank, D.P: Near-infrared studies of the satellites of Saturn and Uranus. Icarus 41, 246–258 (1980).
Cruikshank, D.P, Owen, T.B., Dalle Ore, C, Geballe, T.R., Roush, T.L., de Bergh, C, Sandford, S.A., Poulet, F., Benedix, G.K., Emery, J.P: A spectroscopic study of the surface of Saturn's large satellites: H2O ice, tholins, and minor constituents. Icarus 175, 268–283 (2005).
Czechowski, L.: Parameterized model of convection driven by tidal and radiogenic heating. Adv. Space Res. 38, 788–793 (2006).
Davis, W.L., McKay, C.P: Origins of life: A comparison of theories and application to Mars. Origins Life Evol. Biosph. 26, 61–73 (1996).
Dermott, S.F., Thomas PC: The shape and internal structure of Mimas, Icarus 73, 25–65 (1988).
Dermott, S.F., Malhotra, R., Murray, CD.: Dynamics of the Uranian and Saturnian satellite systems: A chaotic route to melting Miranda? Icarus 76, 295–334 (1988).
Dougherty, M.K., Khurana, K.K., Neubauer, F.M., Russell, C.T., Saur, J., Leisner, J.S., Burton, M.E.: Identification of a dynamic atmosphere at Enceladus with the Cassini magnetometer. Science 311, 1406–1409 (2006).
Durham, W. B., Kirby S.H., Stern, L.A.: Effect of dispersed particulates on the rheology of water ice at planetary conditions, J. Geophys. Res. 97, 20,883–20,897 (1992).
Durham, W.B., Stern, L.A.: Rheological properties of water ice-Applications to satellites of the outer planets. Ann. Rev. Earth Planet. Sci. 29, 295–330 (2001).
Emery, J.P, Burr, D.M., Cruikshank, D.P, Brown, R.H., Dalton, J.B.: Near-infrared.0:8–4:0 (im/ spectroscopy of Mimas, Enceladus, Tethys, and Rhea. Astron. Astrophys. 435, 353–362 (2005).
Esposito, L.W., and 15 co-authors: Ultraviolet imaging spectroscopy shows an active Saturnian system. Science 307, 1251–1255 (2005).
Feibelman, W. A.: Concerning the “D” ring of Saturn. Nature 214, 793–794 (1967).
Friedson, A.J., Stevenson, D.J.: Viscosity of rock ice mixtures and applications to the evolution of icy satellites, Icarus 56, 1–14 (1983).
Gaidos, E.J., Nealson, K.H., Kirschvink, J.L.: Life in ice-covered oceans. Science 284, 1631–1633 (1999).
Giese, B., Wagner, R., Hussmann, H., Neukum, G., Perry, J., Helfen-stein, P, Thomas, PC: Enceladus: An estimate of heat flux and litho-spheric thickness from flexurally supported topography. Geophys. Res. Lett. 35, L24204 (2008).
Gioia, G., Chakraborty, P., Marshak, S., Kieffer, S.W: Unified model of tectonics and heat transport in a frigid Enceladus. Proc. Natl Acad. Sci. 104, 13578–13581 (2007).
Gladman, B., Dones, L., Levison, H.F., Burns, J.A.: Impact seeding and reseeding. in the inner solar system. Astrobiology 5, 483–496 (2005).
Glein, C.R., Zolotov, M.Y., Shock, E.: The oxidation state of hydrother-mal systems on early Enceladus, Icarus 197, 157–163 (2008).
Goldsby, D.L., Kohlstedt, D.L.: Superplastic deformation in ice: Exper-imental observations. J. Geophys. Res. 106, 11,017–11,030 (2001).
Gribb, T.T., Cooper, R.F.: Low frequency shear attenuation in polycrys-talline olivine: Grain boundary diffusion and the physical significance of the Andrade model for viscoelastic rheology J. Geophys. Res. 103, 27,267–27,279 (1998).
Grott, M., Sohl, F, Hussmann, H.: Degree-one convection and the origin of Enceladus' dichotomy, Icarus 191, 203–210 (2007). doi:10.1016/j.icarus.2007.05.001.
Grundy, W.M., Buie, M.W, Stansberry, J.A., Spencer, J.R., Schmitt, B.: Near-infrared spectra of icy outer Solar System surfaces: Remote determination of H2O ice temperatures. Icarus 142, 536–549 (1999).
Haff, P.K., Siscoe, G.L., Eviatar, A.: Ring and plasma — The enigmae of Enceladus. Icarus 56, 426–438 (1983).
Halevy, I., and Stewart S.T.: Is Enceladus' plume tidally controlled?, Geophys. Res. Lett. 35, L12203 (2008). doi: 10.1029/2008GL034349.
Hamilton, D.P, Burns, J.A.: Origin of Saturn's E-ring: Self-sustained, naturally. Science 264, 5158 (1994).
Han, L., Showman, A.P: Implications of shear heating and fracture zones for ridge formation on Europa, Geophys. Res. Lett. 35, L03202 (2008). doi: 10.1029/2007GL031957.
Hand, K.P., Carlson, R.W., Chyba, C.F.: Energy, chemical disequilibrium, and geological constraints on Europa. Astrobiology 7, 1006–1022 (2007).
Hansen, C. J., Esposito L., Stewart, A.I.F., Colwell, J., Hendrix, A., Pryor, W., Shemansky, D., West R.: Enceladus' water vapor plume. Science 311, 1422–1425 (2006).
Hansen, C.J., Esposito, L.W., Stewart, A.I.F., Meinke, B., Wallis, B., Colwell, J.E., Hendrix, A.R., Larsen, K., Pryor, W., Tian, F.: Water vapor jets inside the plume of gas leaving Enceladus. Nature 456, 477–479 (2008).
Hedman, M.M., Nicholson, P.D., Showalter, M.R., Brown, R.H., Buratti, B.J., Clark R.N.: Spectral observations of the Enceladus plume with Cassini-VIMS. Astron. J. 693, 1749–1762 (2009).
Helfenstein, P., Thomas, P.C., Veverka, J., Burns, J.A., Roatsch, T., Giese, B., Wagner, R., Denk, T., Neukum, G., Turtle, E.P., Perry, J., Bray, V., Rathbun, J., Porco, C.C.: Tectonism and terrain evolution on Enceladus,. Icarus, in press (2009).
Hoppa, G.V., Tufts, R., Greenberg, R., Geissler, P.E.: Formation of cy-cloidal features on Europa, Science 285, 1899–1902 (1999).
Howett, C.J.A., Spencer, J.R., Pearl, J.C., Segura, M.: Thermal inertia and bolometric albedo for Mimas, Enceladus, Dione, Rhea and Iapetus as derived from Cassini/CIRS measurements. Icarus: doi: 10.1016/j.icarus.2009.07.016 (2009).
Hurford, T.A., Helfenstein, P., Hoppa, B.V., Greenberg, R., Bills, B.: Eruptions arising from tidally controlled periodic openings of rifts on Enceladus. Nature 447, 292–294 (2007).
Hussmann, H., Spohn, T.: Thermal-orbital evolution of Io and Europa. Icarus 171, 391–410 (2004).
Ingersoll, A.P., Pankine, A.A.: Models of the Enceladus plumes: Criteria for melting. Icarus, submitted (2009).
Jackson I., Faul, U.H., Gerald, J.D.F., Tan B.H.: Shear wave attenuation and dispersion in melt-bearing olivine polycrystals 1. Specimen fabrication and mechanical testing, J. Geophys. Res. 109, B06201 (2004).
Jacobson, R.A., and 13 co-authors: The gravity field of the Saturnian system from satellite observations and spacecraft tracking data. As-tron. J. 132, 2520–2526 (2006).
Jaumann, R., and 18 co-authors: Distribution of icy particles across Enceladus' surface as derived from Cassini-VIMS measurements. Icarus 193, 407–419 (2008).
Johnson, R.E., Famá, M., Liu, M., Baragiola, R.A., Sittler, E.C., Smith, H.T.: Sputtering of ice grains and icy satellites in Saturn's inner magnetosphere. Planet. Space Sci. 56, 1238–1243 (2008).
Johnson, R.E., Smith, H.T., Tucker, O.J., Liu, M., Burger, M.H., Sittler, E.C., Tokar R. L.: The Enceladus and OH tori at Saturn. Astrophys. J. 644, L137–L139 (2006).
Jones, G.H. and 20 co-authors: Fine jet structure of electrically charged grains in Enceladus's plume. Geophys. Res. Lett., in press (2009).
Juhász, A., Horányi, M.: Saturn's E ring: A dynamical approach. J. Geo-phys. Res. 107, 1066 (2002).
Juhász, A., Horányi, M., Morfill, G.E.: Signatures of Enceladus in Saturn's E ring. Geophys. Res. Lett. 34, L09104 (2007).
Jurac, S., Johnson, R.E., Richardson, J.D.: Saturn's E Ring and production of the neutral torus. Icarus 149, 384–396 (2001).
Jurac, S., Richardson, J.D.: A self-consistent model of plasma and neutrals at Saturn: Neutral cloud morphology. J. Geophys. Res. 110, A09220 (2005).
Jurac, S., McGrath, M.A., Johnson, R.E., Richardson, J.D., Vasyliunas, V.M., Eviatar, A.: Saturn: Search for a missing water source. Geo-phys. Res. Lett. 29, 25–1 (2002).
Karato, S.: A dislocation model of seismic wave attenuation and micro-creep in the Earth: Harold Jeffreys and the rheology of the solid Earth. Pure Appl. Geophys. 153, 239–256 (1998).
Kargel J. and Pozio, S. (1996) The volcanic and tectonic history of Enceladus. Icarus 119, 385–404.
Kargel, J.S.: Enceladus: Cosmic gymnast, volatile miniworld. Science 311, 1389–1391 (2006).
Kempf, S., Beckmann, U., Moragas-Klostermeyer, G., Postberg, F., Srama, R., Economou, T., Schmidt, J., Spahn, F., Grün, E.: The E ring in the vicinity of Enceladus. I. Spatial distribution and properties of the ring particles. Icarus 193, 420–437 (2008).
Khurana, K.K., Dougherty, M.K., Russell, C.T., Leisner, J.S.: Mass loading of Saturn's magnetosphere near Enceladus. J. Geophys. Res. 112, A08203 (2007).
Kieffer, S. W.: Dynamics and thermodynamics of volcanic eruptions: Implications for the plumes of Io. In: Morrison, D. (ed.) Satellites of Jupiter, pp. 647–723. Univ. Ariz. Press, Tucson (1982).
Kieffer, S., Lu, X., Bethke, C.M., Spencer, J.R., Marshak, S., Navrotsky, A.: A clathrate reservoir hypothesis for Enceladus' south polar plume. Science 314, 1764–1766 (2006).
Kieffer, S.W., Lu, X., McFarquhar, G., Wohletz, K.H.: A redetermina-tion of the ice/vapor ratio of Enceladus' plumes: Implications for sublimation and the lack of a liquid water reservoir. Icarus, submitted (2009).
Kirk, R.L., Soderblom, L.A., Brown, R.H., Kieffer, S.W., Kargel, J.S.: Triton's plumes: Discovery, characteristics, and models. In: Cruikshank, D.P. (ed.) Neptune and Triton, pp. 949–989. Univ. Ariz. Press, Tucson (1995).
Lazcano, A., Miller, S.L.: How long did it take for life to begin and evolve to cyanobacteria? Journal of Molecular Evolution 39, 546–554 (1994).
Lin, L.-H., and 13 co-authors: Long-term sustainability of a high-energy, low-diversity crustal biome. Science 314, 479–482 (2006).
Lissauer, J.J., Peale, S.J., Cuzzi J.N.: Ring torque on Janus and the melting of Enceladus, Icarus 58, 159–168 (1984).
Lissauer, J.J., Squyres, S.W., Hartmann, W.K.: Bombardment history of the Saturn system. J. Geophys. Res. 93, 13776–13804 (1988).
Lunine, J.I., Gautier, D.: Coupled physical and chemical evolution of volatiles in the protoplanetary disk: A tale of three elements. In: Festou, M.C., Keller, H.U., Weaver, H.A. (eds.), Comets II, pp. 105–113, Univ. Ariz. Press, Tucson (2004).
Manga, M., Wang, C.-Y.: Pressurized oceans and the eruption of liquid water on Europa and Enceladus. Geophys. Res. Lett. 34, L07202 (2007).
Matson, D.L., Castillo, J.C., Lunine, J., Johnson, T.V.: Enceladus' plume: Compositional evidence for a hot interior. Icarus 187569–573 (2007).
Matsuyama, I., Nimmo, F.: Tectonic patterns on reoriented and despun planetary bodies. Icarus 195, 459–473 (2008).
McCollom, T.M.: Methanogenesis as a potential source of chemical energy for primary biomass production by autotrophic organisms in hydrothermal systems on Europa. J. Geophys. Res. 104, 30,729–30,742 (1999).
McCord, T.B., and 11 co-authors: Salts on Europa's surface detected by Galileo's Near Infrared Mapping Spectrometer. Science 280, 1242 (1998).
McKay, C.P., Porco, C.C., Altheide, T. Davis, W.L., Kral, T.A.: The possible origin and persistence of life on Enceladus and detection of biomarkers in the plume. Astrobiology 8, 909–919 (2008).
McKinnon, W. B.: On convection in ice I shells of outer solar system bodies, with specific application to Callisto. Icarus 183, 435–450 (2006).
Melosh, H.J.: The rocky road to panspermia. Nature 332, 687–688 (1988).
Meyer, J., Wisdom, J.: Tidal heating in Enceladus. Icarus 188, 535–539 (2007).
Meyer, J., Wisdom, J.: Tidal evolution of Mimas, Enceladus, and Dione. Icarus 193, 213–223 (2008).
Miller, D.J., Barnash, A.N., Bray, V.J., Turtle, E. P., Helfenstein, P., Squyres, S. W., Rathbun, J. A.: Interactions between impact craters and tectonic fractures on Enceladus and Dione. Workshop on Ices, Oceans, and Fire: Satellites of the Outer Solar System, held August 13–15, 2007. Boulder, Colorado, LPI Contribution No. 1357, pp. 95–96 (2007).
Miller, S.L.: A production of amino acids under possible primitive Earth conditions. Science 117, 528–529 (1953).
Mitri, G., Showman, A.P.: A model for the temperature-dependence of tidal dissipation in convective plumes on icy satellites: Implications for Europa and Enceladus, Icarus 195, 758–764 (2008).
Moore, J.M., Schenk, P.M., Bruesch, L.S., Asphaug, E., McKinnon, W.B.: Large impact features on middle-sized icy satellites. Icarus 171, 421–443 (2004).
Mousis, O, Gautier, D., Bockelee-Morvan, D.: An evolutionary turbulent model of Saturn's subnebula: Implications for the origin of the atmosphere of Titan. Icarus 156, 162–175 (2002). doi:10.1016/icar.2001.6782.
Murray, C., Dermott, S.: Solar System Dynamics. Cambridge Univ. Press, Cambridge (1999).
Nash, D.B., Carr, M.H., Gradie, J., Hunten, D.M., Yoder, C.F.: Io. In: Burns J.A., Matthews, M.S. (eds.) Satellites, pp. 629–688. Univ. Ariz. Press, Tucson (1986).
Neukum, G.: Cratering records of the satellites of Jupiter and Saturn. Adv. Space Res. 5, 107–116 (1985).
Newman, S.F., Buratti, B.J., Jaumann, R., Bauer, J.M., Momary, T.W.: Hydrogen peroxide on Enceladus. Astrophys. J. 670, L143–L146 (2007).
Newman, S.F., Buratti, B.J., Brown, R.H., Jaumann, R., Bauer, J., Momary, T.: Photometric and spectral analysis of the distribution of crystalline and amorphous ices on Enceladus as seen by Cassini. Icarus 193, 397–406 (2008).
Nicholson, P.D., Showalter, M.R., Dones, L., French, R.G., Larson, S.M., Lissauer, J.J., McGhee, C.A., Sicardy, B., Seitzer, P., Danielson, G.E.: Observations of Saturn's ring plane crossings in August and November 1995. Science 272, 509–515 (1996).
Nimmo, F., Pappalardo, R.T.: Diapir-induced reorientation of Saturn's moon Enceladus. Nature 441, 614–616 (2006).
Nimmo, F., Gaidos E.: Thermal consequences of strike-slip motion on Europa. J. Geophys. Res. 107, 5021 (2002).
Nimmo, F., Spencer, J.R., Pappalardo, R.T., Mullen, M.E.: Shear heating as the origin of the plumes and heat flux on Enceladus. Nature 447, 289–291 (2007).
Ojakangas, G.W., Stevenson, D.J.: Thermal state of an ice shell on Eu-ropa. Icarus 81, 220–241 (1989).
Ojakangas, G.W., Stevenson, D.J.: Episodic volcanism of tidally-heated satellites with application to Io. Icarus 66, 341–358 (1986).
Orgel, L.E.: The origin of life – how long did it take? Origins Life Evol. Biosphere. 28, 91–96 (1998).
Pang, K.D., Voge, C.C., Rhoads, J.W., Ajello, J.M.: The E ring of Saturn and satellite Enceladus. J. Geophys. Res. 89, 9459–9470 (1984).
Pappalardo, R.T., Barr A.C., The origin of domes on Europa: The role of thermally induced compositional diapirism. Geophys. Res. Lett. 31, L01701 (2004).
Parkinson, C.D., Liang, M.-C., Hartman, H., Hansen, C.J., Tinetti, G., Meadows, V., Kirschvink, J.L., Yung Y.L.: Enceladus: Cassini observations and implications for the search for life. Astron. Astro-phys. 463, 353–357 (2007).
Parkinson, C.D., Liang, M.-C., Yung, Y.L., Kirschvink, J.L.: Habitabil-ity of Enceladus: Planetary conditions for life. Origins Life Evol. Biospheres (2008). doi:10.1007/s11084-008-9135-4.
Passey, Q.: Viscosity of the lithosphere of Enceladus. Icarus 53, 105–120 (1983).
Peale S.J., Cassen P.: Contribution of tidal dissipation to lunar tidal history, Icarus 36, 245–269 (1978).
Plescia, J.B., Boyce, J.M.: Crater numbers and geological histories of Iapetus, Enceladus, Tethys and Hyperion. Nature 301, 666–670 (1983).
Porco, C. C., and 24 co-authors: Cassini observes the active south pole of Enceladus. Science 311, 1393–1401 (2006).
Postberg, F., Kempf, S., Hillier, J.K., Srama, R., Green, S.F., McBride, N., Grün, E.: The E-ring in the vicinity of Enceladus II. Probing the moon's interior—The composition of E-ring particles. Icarus 193, 438–454 (2008).
Postberg, F., Kempf, S., Schmidt, J., Brillantov, N., Beinsen, A., Abel, B., Buck, U., Srama, R.: Sodium salts in E Ring ice grains from an ocean below Enceladus' surface. Nature 459, 1098–1101 (2009).
Rappaport, N.J., Iess, L., Tortora, P., Anabtawi, A., Asmar, S., Somenzi, L., Zingoni, F.: Mass and interior of Enceladus from Cassini data analysis, Icarus 190, 175–178 (2007).
Razzaghi, A., Di Pietro, D., Simon-Miller, A., Spencer, J.: Ence-ladus Flagship Mission Concept Study. NASA-Goddard Spaceflight Center, http://www.lpi.usra.edu/opag/Enceladus_Public_Report.pdf (2007). Accessed 9 April 2009.
Reh, K., Elliot, J., Spilker, T., Jorgensen, E., Spencer, J., Lorenz, R.: Titan and Enceladus $1B mission feasibility study report. JPL D-37401B (2007).
Roatsch, T., Wählisch, M., Giese, B., Hoffmeister, A., Matz, K.-D., Scholten, F., Kuhn, A., Wagner, R., Neukum, G., Helfenstein, P., Porco, C.: High-resolution Enceladus atlas derived from Cassini-ISS images. Planet. Space Sci. 56, 109–116 (2008).
Roberts, J.H., Nimmo F.: Tidal heating and the long-term stability of a subsurface ocean on Enceladus. Icarus 194, 675–689 (2008a).
Roberts, J.H., Nimmo F.: Near-surface heating on Enceladus and the south polar thermal anomaly. Geophys. Res. Lett. 35L09201 (2008b).
Roddier, C., Roddier, F., Graves, J.E., Northcott M.: Discovery of an arc of particles near Enceladus' orbit: A possible key to the origin of the E ring. Icarus 136, 50–59 (1998).
Ross, M., Schubert, G.: Tidal dissipation in a viscoelastic planet. Proc. 16th Lunar Planet Sci. Conf. Pt 2, J. Geophys Res. 91, D447–D452 (1986).
Ross, M.N., Schubert, G.: Viscoelastic models of tidal heating in Ence-ladus, Icarus 78, 90–101 (1989).
Rudolph, M.L., Manga, M.: Fracture penetration in planetary ice shells. Icarus 199, 536–541 (2009).
Saur, J., Schilling, N., Neubauer, F.M., Strobel, D.F., Simon, S., Dougherty, M.K., Russell, C.T., Pappalardo, R.T.: Evidence for temporal variability of Enceladus' gas jets: Modeling of Cassini observations. Geophys. Res. Lett. 35, 20105 (2008).
Schmidt, J., Brilliantov, N., Spahn, F., Kempf, S.: Slow dust in Ence-ladus' plume from condensation and wall collisions in tiger stripe fractures. Nature 451, 685–688 (2008).
Schneider, N.M., Burger, M.H., Schaller, E.L., Brown, M.E., Johnson, R.E., Kargel, J.S., Dougherty, M., Achilleos N.: No sodium in Ence-ladus' vapor plumes. Nature 459, 1102–1104 (2009).
Schubert, G., Anderson, J.D., Travis, B.J., Palguta, J.: Enceladus: Present internal structure and differentiation by early and long-term radiogenic heating. Icarus 188, 345–355 (2007).
Segatz, M.T., Spohn, T., Ross, M.N., Schubert G.: Tidal dissipation, surface heat flow, and figure of viscoelastic models of Io. Icarus 75, 187–206 (1988).
Shemansky, D.E., Matheson, P., Hall, D.T., Hu, H.-Y., Tripp, T.M.: Detection of the hydroxyl radical in the Saturn magnetosphere. Nature 363, 329–331 (1993).
Shock, E.L.: Geochemical constraints on the origin of organic compounds in hydrothermal systems. Origins Life Evol Biosphere 20, 331–367 (1990).
Showalter, M.R., Cuzzi, J.N., Larson, S.M.: Structure and particle properties of Saturn's E Ring. Icarus 94, 451–473 (1991).
Showman A.P., Stevenson, D.J., Malhotra, R.: Coupled orbital and thermal evolution of Ganymede. Icarus 129, 367–383 (1997).
Showman, A.P., Han, L.J.: Effects of plasticity on convection in an ice shell: Implications for Europa. Icarus 177, 425–437 (2005).
Smith, B.A., and 28 co-authors: A new look at the Saturn system: The Voyager 2 images, Science 215, 504–537 (1982).
Smith, H.T., Shappirio, M., Johnson, R.E., Reisenfeld, D., Sittler, E.C., Crary, F.J., McComas, D.J., Young, D.T.: Enceladus: The likely dominant nitrogen source in Saturn's magnetosphere. Icarus 188, 356–366 (2008a).
Smith, H.T., Shappirio, M., Johnson, R.E., Reisenfeld, D., Sittler, E.C., Crary, F.J., McComas, D.J., Young, D.T.: Enceladus: A potential source of ammonia products and molecular nitrogen for Saturn's magnetosphere. J. Geophys. Res. 113, A11206 (2008b).
Smith-Konter, B., Pappalardo R.T.: Tidally driven stress accumulation and shear failure of Enceladus's tiger stripes. Icarus 198, 435–451 (2008).
Solomatov, V.S., Barr A.C.: Onset of convection in fluids with strongly temperature-dependent, power-law viscosity 2. Dependence on the initial perturbation. Phys. Earth and Planet. Int. 165, 1–13 (2007).
Sotin, C., Head, J.W., Tobie G.: Europa: Tidal heating of upwelling thermal plumes and the origin of lenticulae and chaos melting. Geophys. Res. Lett. 29, 1233 (2002).
Spahn, F. and 15 co-authors: Cassini dust measurements at Ence-ladus and implications for the origin of the E ring. Science 311, 1416–1418 (2006a).
Spahn, F. Albers, N., Hörning, M., Kempf, S., Krivov, A.V., Makuch, M., Schmidt, J., Seiß, M., Miodrag, S.: E ring dust sources: Implications from Cassini's dust measurements. Planet. Space Sci. 54, 1024–1032 (2006b).
Spencer, J.R., Pearl, J.C., Segura, M., Flasar, F.M., Mamoutkine, A., Romani, P., Buratti, B.J., Hendrix, A.R., Spilker, L.J., Lopes, R.M.C.: Cassini Encounters Enceladus: Background and the discovery of a south polar hot spot, Science 311, 1401–1405 (2006).
Spitale, J.N., Porco, C.C.: Association of the jets of Enceladus with the warmest regions on its south-polar fractures. Nature 449, 695–697 (2007).
Squyres, S.W., Reynolds, R.T., Cassen P.M., Peale, S.J.: The evolution of Enceladus, Icarus 53, 319–331 (1983).
Stevens, T.O., McKinley J.P.: Lithoautotrophic microbial ecosystems in deep basalt aquifers. Science 270, 450–454 (1995).
Thomas, P.C. Burns, J.A., Helfenstein, P., Squyres, S., Veverka, J., Porco, C., Turtle, E.P., McEwen, A., Denk, T., Giese, B., Roatsch, T., Johnson, T.V., Jacobson, R.A.: Shapes of the Saturnian icy satellites and their significance. Icarus 190, 573–584 (2007).
Tian, F., Stewart, A.I.F., Toon, O.B., Larsen, K.W., Esposito, L.W.: Monte Carlo simulations of the water vapor plumes on Enceladus. Icarus 188, 154–161 (2007).
Tice, M.M., Lowe, D.R.: Photosynthetic microbial mats in the 3,416-Myr-old ocean. Nature 431, 549–552 (2004).
Tobie, G., Mocquet, A., Sotin, C.: Tidal dissipation within large icy satellites: Applications to Europa and Titan. Icarus 177, 534–549 (2005).
Tobie, G., Cadek, O., Sotin, C.: Solid tidal friction above a liquid water reservoir as the origin of the south pole hotspot on Enceladus, Icarus 196, 642–652 (2008). doi:10.1016/j.icarus.2008.03.008.
Tyler, R. H.: Strong ocean tidal flow and heating on moons of the outer planets. Nature 456, 770–772 (2008).
Verbiscer, A.J., French, R.G., McGhee, C.A.: The opposition surge of Enceladus: HST observations 338–1022nm. Icarus 173, 66–83 (2005).
Verbiscer, A.J., Peterson, D.E., Skrutskie, M.F., Cushing, M., Helfen-stein, P., Nelson, M.J. Smith, J.D., Wilson J. C.: Near-infrared spectra of the leading and trailing hemispheres of Enceladus. Icarus 182, 211–223 (2006).
Verbiscer, A., French, R., Showalter, M., Helfenstein, P.: Ence-ladus: Cosmic graffiti artist caught in the act. Science 315, 815 (2007).
Wächtershäuser, G.: The case for the chemoautotrophic origin of life in an iron-sulfur world. Origins Life Evol. Biosphere 20,173–176 (1990).
Waite, J. H., and 16 co-authors: Ammonia, radiogenic Ar, organics, and deuterium measured in the plume of Saturn's icy moon Enceladus. Nature 460, 487–490 (2009).
Waite, J. H., and 13 co-authors: Cassini Ion and Neutral Mass Spectrometer: Enceladus plume composition and structure. Science 311, 1419–1422 (2006).
Weiss, B.P., Kirschvink, J.L., Baudenbacher, F.J., Vali, H., Peters, N.T., Macdonald, F.A., Wikswo J.P.: A low temperature transfer of ALH84001 from Mars to Earth. Science 290, 791–795 (2000).
Wisdom, J.: Spin-orbit secondary resonance dynamics of Enceladus. Astron. J. 128, 484–491 (2004).
Zahnle, K., Schenk, P., Levison, H., Dones L.: Cratering rates in the outer Solar System. Icarus 163, 263–289 (2003).
Zolotov, M. Y.: An oceanic composition on early and today's Enceladus, Geophys. Res. Lett. 34, L23203 (2007). doi:10. 1029/2007GL031234.
Zschau, J. Tidal friction in the solid Earth: Loading tides versus body tides. In: Brosche P., Sundermann, J. (eds.) Tidal Friction and the Earth's Rotation. Springer, Berlin (1978).
Acknowledgments
We wish to thank everyone who has made these discoveries possible, by contributing to the success of the Cassini/Huygens project. This work was funded by the Cassini Project and by NASA.
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Spencer, J.R. et al. (2009). Enceladus: An Active Cryovolcanic Satellite. In: Dougherty, M.K., Esposito, L.W., Krimigis, S.M. (eds) Saturn from Cassini-Huygens. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9217-6_21
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