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Possible Mechanisms for Cometary Outbursts

Published online by Cambridge University Press:  12 April 2016

David W. Hughes
David W. Hughes*
Affiliation:
Department of Physics University of Sheffield Sheffield, S3 7RH, U.K.

Abstract.

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A cometary outburst is an unexpected flare-up in the brightness of a comet, with the brightness normally increasing by 2 to 3 magnitudes, but on occasion by up to 5. This outburst is superimposed on the general change in brightness that is related to the comet’s heliocentric and geocentric distance, spin phase, spin axis orientation and activity geography. The brightness variation during outbursts usually has an abrupt, eruptive onset followed by a quasi-exponential decrease and lasts for a few tens of days. Several cometary outbursts are accompanied by the expansion of a spherical halo from the brightest point at the centre of the visible cometary coma.

Information

Type
Section IV: The Cometary Nucleus
Information
International Astronomical Union Colloquium , Volume 116 , Issue 2: Comets in the Post-Halley Era , 1991, pp. 825 - 851
Copyright
Copyright © Kluwer 1991

References

Beyer, M. (1948). ‘Physische Beobachtungen von Kometan. VI.’ Astron. Nachr., 275, 237–250.Google Scholar
Brandt, J.C., and Mendis, D.A. (1979). ‘The interactions of the solar wind with comets.’ In Solar System Plasma Physics, Vol. II, Kennel, C.F., Lanzerotti, L.J., and Parker, E.N. (eds.), North Holland Publ. Co., Amsterdam, pp. 253–292.Google Scholar
Campins, H., and Ferrin, I. (1978). ‘Cometary outbursts.’ Bull. Am. Astr.Soc, 10, 613.Google Scholar
Cochran, A.L., Barker, E.S., and Cochran, W.D. (1980). ‘Spectrophotometric observations of P/Schwassmann-Wachmann I during outburst.’ Astron. J., 85, 474–477.Google Scholar
Cruikshank, D.P., and Brown, R.H. (1983). ‘The nucleus of P/Schwassmann-Wachmann I.’ Icarus, 56, 377–380.CrossRefGoogle Scholar
Daniels, P.A., and Hughes, D.W. (1981). ‘The accretion of cosmic dust – a computer simulation.’ Mon. Not. R. Astr. Soc, 195, 1001–1009.CrossRefGoogle Scholar
Degewij, J., and Tedesco, E.F. (1982). ‘Do comets evolve into asteroids? Evidence from physical studies.’ In Comets, Wilkening, L.L. (ed.), University of Arizona Press, Tucson, pp. 85–130.Google Scholar
Delsemme, A.H. (1966). ‘Vers un modele physico-chimique du noyau cometaire.’ In Nature et Origine des Cometes, Mem. Soc. Roy. Sci. Liege, Ser. 5, 12, Universite de Liege, pp. 77–110.Google Scholar
Delsemme, A.H. (1985). ‘The sublimation temperature of the cometary nucleus: Observational evidence for H2O snows.’ In Ices in the Solar System, Klinger, J., Benest, D. Dollfus, A., and Smoluchowski, R. (eds.), D. Reidel Publ. Co., Dordrecht, pp. 367–387.Google Scholar
Delsemme, A.H. (1986). ‘Elemental isotopic and moelcular abundances in comets.’ In Asteroids, Comets, Meteors II, Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H. (eds.), Uppsala Universitet Reprocentralen, pp. 245–257.Google Scholar
Delsemme, A.H., and Wenger, A. (1970). ‘Superdense water ices.’ Science, 167, 44–45.Google Scholar
Donn, B., and Hughes, D.W. (1986). ‘A fractal model of a cometary nucleus formed by random accretion.’ In Exploration of Comet Halley, ESA SP-250, pp. 523–524.Google Scholar
Donn, B., and Urey, H.C. (1956). ‘On the mechanism of cometary outbursts and the chemical composition of comets.’ Astrophys. J., 123, 339–342.CrossRefGoogle Scholar
Feldman, P.D., Festou, M.C., A’Hearn, M.F., Arpigny, C., Butterworth, P.S., Cosmovici, C.B., Danks, A.C., Gilmozzi, R., Jackson, W.M., McFadden, L.A., Patriachi, P., Schleicher, D.G., Tozzi, G.P., Wallis, M.K., Weaver, H.A., and Woods, T.N. (1986a). ‘IUE observations of comet Halley: Evolution of the UV spectrum between September 1985 and July 1986.’ In Exploration of Comet Halley, ESA SP-250, pp. 325–328.Google Scholar
Feldman, P.D., A’Hearn, M.F., Festou, M.C., McFadden, L.A., Weaver, H.A., and Woods, T.N. (1986b). ‘Is CO2 responsible for the outbursts of comet Halley?’ Nature, 324, 433–436.CrossRefGoogle Scholar
Flammer, K.R., Jackson, B., and Mendis, D.A. (1986). ‘On the brightness variations of comet Halley at large heliocentric distances.’ Earth, Moon and Planets, 35, 203–212.CrossRefGoogle Scholar
Greenberg, J.M. (1986). ‘Fluffy comets.’ In Asteroids, Comets, Meteors II, Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H. (eds.), Uppsala Universitet Reprocentralen, pp. 221–223.Google Scholar
Herman, G., and Weissman, P.R. (1987). ‘Numerical simulation of cometary nuclei.’ Icarus, 69, 314–328.CrossRefGoogle Scholar
Horanyi, M., Gombosi, Y.I., Cravens, T.E., Korosmezey, K., Kecskemety, A.F., Nagy, A.F., and Szego, K. (1984). ‘The friable sponge model of a cometary nucleus.’ Astrophys. J., 278, 449–455.CrossRefGoogle Scholar
Hughes, D.W. (1975). ‘Cometary outbursts: A brief survey.’ Quart. Jl. Roy. Astr. Soc, 16, 410–427.Google Scholar
Hughes, D.W. (1978). ‘Meteors.’ In Cosmic Dust, McDonnell, J.A.M. (ed.), John Wiley and Sons, Chichester, pp. 123–185.Google Scholar
Hughes, D.W. (1983). ‘Cometary dust, its source and characteristics.’ In Asteroids, Comets, Meteors I, Lagerkvist, C.I. and Rickman, H. (eds.), Uppsala Universitet Reprocentralen, pp. 239–257.Google Scholar
Hughes, D.W. (1985). ‘The size, mass, mass loss and age of Halley’s comet.’ Mon. Not. R. Astr. Soc, 213, 103–109.Google Scholar
Hughes, D.W. (1986a). ‘Meteoroids: The best clues to the structure of a cometary nucleus?’ In Comet Nucleus Sample Return, ESA SP-249, pp. 173–179.Google Scholar
Hughes, D.W. (1986b). ‘The relationship between comets and meteoroid streams.’ In Asteroids, Comets, Meteors II, Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H. (eds.), Uppsala Universitet Reprocentralen, pp. 503–519.Google Scholar
Hughes, D.W. (1987). ‘The history of Halley’s comet.’ Phil. Trans. R. Soc. Lond., A323, 349–367.Google Scholar
Hughes, D.W. (1988a). ‘Cometary magnitude distribution and the relationship between the number of short- and long-period comets.’ Icarus, 73, 149–162.Google Scholar
Hughes, D.W. (1988b). ‘The brightness of P/Halley and the surface activity of the nucleus at previous apparitions.’ Mon. Not. R. Astr. Soc, 234, 173–176.CrossRefGoogle Scholar
Hughes, D.W., and McBride, N. (1990). ‘The spatial density of large meteoroids in the inner solar system.’ Mon. Not. R. Astr. Soc, in press.Google Scholar
Hughes, D.W., Searle, R.M., and Street, R.A. (1974). ‘Spatial distribution of cometary outbursts.’ Nature, 253, 615–616.Google Scholar
Jewitt, D. (1990). ‘The persistent coma of comet P/Schwassmann-Wachmann I.’ Astrophys. J., in press.Google Scholar
Keller, H.U., Delamere, W.A., Huebner, W.F., Wilhelm, K., Curdt, W., Kramm, R., Thomas, N., Arpigny, C., Barbiera, C., Bonnet, R.M., Case, S., Coradini, M., Cosmovici, C.B., Hughes, D.W., Jamar, C., Malaise, D., Schmidt, K., Schmidt, W.K.H., and Seige, P. (1987). ‘Comet P/Halley’s nucleus and its activity.’ Astron. Astrophys., 187, 807–823.Google Scholar
Klinger, J. (1980). ‘Influence of a phase transition of ice on the heat and mass balance of comets.’ Science, 209, 271–272.Google Scholar
Krankowsky, D., Làmmerzahl, P., Herrwerth, I., Woweries, J., Eberhardt, P., Dolder, U., Herrmann, U., Schulte, W., Berthelier, J.J., Iliano, J.M., Hodges, R.R., and Hoffman, J.H. (1986). ‘In situ gas and ion measurement at comet Halley.’ Nature, 321, 326–329.CrossRefGoogle Scholar
Kresák, L. (1966). ‘On two aspects of the evolution of short-period comets.’ In Nature et Origine des Cometes, Mem. Soc. Roy. Sci. Liege, Ser. 5, 12, Universite de Liege, pp. 459–480.Google Scholar
Kresák, L. (1974). ‘The outbursts of periodic comet Tuttle-Giacobini-Kresák.’ Bull. Astr. Inst. Czech., 25, 293–304.Google Scholar
Kührt, E., and Mohlmann, D. (1984). ‘Thermal stress in cometary nuclei.’ Gerl. Beitr. Geoph., 93, 232–234.Google Scholar
Larson, H.P., Hong-Yau, H., Mumma, M.J., and Weaver, H.A. (1989). ‘Outburst of H2O in comet Halley.’ Icarus, in press.Google Scholar
McDonnell, J.A.M., Kissel, J., Grun, E., Grard, R.J.L., Langevin, Y., Olearczyk, R.E., Perry, C.H., and Zarnecki, J.C. (1986). ‘Giotto’s dust impact detection system DIDSY and the particulate impact analyser PIA: Interim assessment of the dust distribution and properties within the coma.’ In Exploration of Comet Halley, ESA SP-250, Vol. II, pp. 25–38.Google Scholar
McDonnell, J.A.M., Pankiewics, G.S., Birchley, P.N.W., Green, S.F., and Perry, C.H. (1989). ‘The in-situ cometary particulate size distribution measured for one comet: P/Halley.’ In Proceedings of Workshop on Analysis of Returned Comet Nucleus Samples, Milpitas, California, in press.Google Scholar
Miller, S.L. (1961). ‘The occurrence of gas hydrates in the solar system.’ Proc. Nat. Acad. Sci., 47, 1798.CrossRefGoogle ScholarPubMed
Niedner, M.B. (1980). ‘Interplanetary gas XXV. A solar wind and interplanetary magnetic field interpretation of cometary light outbursts.’ Astrophys. J., 241, 820–829.CrossRefGoogle Scholar
Patashnick, H., Rupprecht, G., and Schuerman, D.W. (1974). ‘Energy source for cometary outburst.’ Nature, 250, 313–314.Google Scholar
Peale, S.J. (1989). ‘On the density of Halley’s comet.’ Icarus, 82, 36–49.CrossRefGoogle Scholar
Pittich, E.M. (1969). Bull. Astr. Inst. Czech., 20, 251.Google Scholar
Pittich, E.M. (1971). ‘Space distribution of the splitting and outbursts of comets.’ Bull. Astr. Inst. Czech., 22, 143–153.Google Scholar
Pittich, E.M. (1972). ‘Splitting and sudden outbursts of comets as indicators of nongravitational effects.’ In The Motion, Evolution of Orbits and Origin of Comets, I.A.U. Symposium 45, Chebotarev, G.A. and Kazimirchak-Polonskaya, E.I. (eds.), pp. 283–286.Google Scholar
Prialnik, D., and Bar-Nun, A. (1987). ‘On the evolution and activity of cometary nuclei.’ Astrophys. J., 313, 893–905.Google Scholar
Richter, N.B. (1941). ‘Helligkeitsschwankungander kometen und sonnentatigkeit: I. Erster Schwassmann-Wachmann’scher komet (1925 II).’ Astr. Nachr., 271, 207.CrossRefGoogle Scholar
Richter, N.B. (1948a). ‘Helligkeitsschwankungen der kometen und sonnentatigkeit: II. Statistigk und theorie abnormer lichtausbruche von kometenkernen.’ Astr. Nachr., 277, 12.Google Scholar
Richter, N.B. (1948b). ‘Objekt keuskamp und das problem der unbestatigten kometenentdeckungen.’ Stern, 24, 52.Google Scholar
Richter, N.B. (1954). ‘Die helligkeitsausbruche des kometen 1925 II (Schwassmann-Wachmann I) und ihre korrelation zu erdmagnetischen ereignissen.’ Astr. Nachr., 281, 241.Google Scholar
Richter, N.B. (1963). The Nature of Comets, Methuen, London, p. 142.Google Scholar
Rickman, H. (1986). ‘Masses and densities of comets Halley and Kopff.’ In Comet Nucleus Sample Return, ESA SP-249, pp. 195–205.Google Scholar
Rickman, H., Kamel, L., Festou, M.C., and Froeschle, C. (1987). ‘Estimates of the mass, volume and densitites of short-period comet nuclei.’ In Diversity and Similarity of Comets, ESA SP-278, pp. 471–481.Google Scholar
Roemer, E. (1958). ‘An outburst of comet Schwassmann-Wachmann I.’ Publ. Astron. Soc. Pacific, 70, 272.Google Scholar
Roemer, E. (1962). ‘Activity in comets at large heliocentric distances.’ Publ. Astron. Soc. Pacific, 74, 351–365.Google Scholar
Roemer, E. (1963). ‘Comets: Discovery, orbits, astrometric observation.’ In The Moon, Meteorites, and Comets, Middlehurst, B.M. and Kuiper, G.P. (eds.), University of Chicago Press, Chicago, pp. 527–549.Google Scholar
Roemer, E., and Lloyd, R.E. (1966). ‘Observations of comets, minor planets and satellites.’ Astron. J., 71, 443–457.CrossRefGoogle Scholar
Sandford, S.A., and Allamandola, L.J. (1988). ‘The condensation and vapourization behavior of H2O:CO2 ices and implications for interstellar grains and cometary activity.’ Icarus, 76, 210–224.CrossRefGoogle Scholar
Sekanina, Z. (1972). ‘Outbursts of comet Schwassmann-Wachmann I, and the cloud of interplanetary boulders.’ In Asteroids, Comets, Meteoric Matter, I.A.U. Colloquium 22, Nice, France, April 1972.Google Scholar
Sekanina, Z. (1982). ‘The problem of split comets in review.’ In Comets, Wilkening, L.L. (ed.), University of Arizona Press, Tucson, pp. 251–287.Google Scholar
Smoluchowski, R. (1981). ‘Amorphous ice and the behaviour of cometary nuclei.’ Astrophys. J., 244, L31–L34.Google Scholar
Smoluchowski, R. (1985). ‘Amorphous ice and porous ice in cometary nuclei.’ In Ices in the Solar System, Klinger, J., Benest, D., Dollfus, A., and Smoluchowski, R. (eds.), D. Reidel Publ. Co., Dordrecht, pp. 397–406.Google Scholar
Smoluchowski, R. (1986). ‘Brightness curve and porosity of cometary nuclei.’ In Asteroids, Comets, Meteors II, Lagerkvist, C.-I., Lindblad, B.A., Lundstedt, H., and Rickman, H. (eds.), Uppsala Universitet Reprocentralen, pp. 305–315.Google Scholar
Tauber, F., and Kürht, E. (1987). ‘Thermal stress in cometary nuclei.’ Icarus, 69, 83–90.Google Scholar
Venkatesh, C.G., Rice, S.A., and Narten, A.H. (1974). ‘Amorphous solid water: An X-ray diffraction study.’ Science, 186, 927–928.Google Scholar
Vsekhsviatskii, S.K. (1966). ‘Comet flares and the nature of the cometary nucleus.’ In Nature et Origine des Cometes, Mem. Soc. Roy. Sci. Liege, Ser. 5, 12, Universite de Liege, pp. 53–64.Google Scholar
Walker, M.F. (1959). ‘Observations of comet Schwassmann-Wachmann I during an outburst.’ Publ. Astron. Soc. Pacific, 71, 169.Google Scholar
Wallis, M.K., and MacPherson, A.K. (1981). ‘On the outgassing and jet thrust of snowball comets.’ Astron. Astrophys., 98, 45–49.Google Scholar
Weissman, P.R. (1986). ‘How pristine are cometary nuclei?’ In Comet Nucleus Sample Return, ESA SP-249, pp. 15–25.Google Scholar
Whipple, F.L. (1951). ‘A comet model I: The acceleration of comet Encke.’ Astrophys. J., 111, 375–394.Google Scholar
Whipple, F.L. (1963). ‘On the structure of the cometary nucleus.’ In The Moon, Meteorites, and Comets, Middlehurst, B.M. and Kuiper, G.P. (eds.), University of Chicago Press, Chicago, pp. 639–664.Google Scholar
Whipple, F.L. (1980). ‘Rotation and outbursts of comet P/Schwassmann-Wachmann I.’ Astron. J., 85, 305–313.Google Scholar
Whipple, F.L. (1982). ‘The rotation of cometary nuclei.’ In Comets, Wilkening, L.L. (ed.), University of Arizona Press, Tucson, pp. 227–250.Google Scholar
Whipple, F.L. (1985). The Mystery of Comets, Smithsonian Inst. Press, Washington, D.C., p. 173.Google Scholar
Whipple, F.L. (1987). ‘The cometary nucleus: Current concepts.’ Astron. Astrophys., 187, 852–858.Google Scholar
Whipple, F.L., and Sekanina, Z. (1979). ‘Comet Encke: Precession of the spin axis, nongravitational motion and sublimation.’ Astron. J., 84, 1894–1909.Google Scholar
Whipple, F.L., and Stefanik, R.P. (1966). ‘On the physics and splitting of cometary nuclei.’ In Nature et Origine des Cometes, Mem. Soc. Roy. Sci. Liege, Ser. 5, 12, Université de Liege, pp. 33–52.Google Scholar
Whitney, C.A. (1955). ‘Cometary outbursts.’ Astrophys. J., 122, 190–195.Google Scholar
Wood, J.A. (1986). ‘Cometary nucleus models: A review.’ In Comet Nucleus Sample Return, ESA SP-249, pp. 123–131.Google Scholar
Yeomans, D.K. (1989). Icarus, in press.Google Scholar