Andrew Prentice is an Australian mathematician. He is known for developing an alternative model of planetary formation. In contrast to the conventional model where planetary accretion occurs within a continuous disk, according to Prentice's "Modern Laplacian Theory" each planet accretes within a discrete circumsolar gas ring.[1] Prentice's nested gas rings arise due to the effect of 'supersonic turbulent convection' in slowing the infall of interstellar dust and gas. Instead of collapsing directly to form a flat continuous disk, due to 'turbulent stress' the gas temporarily remains puffed up in a vast rotating spheroidal atmosphere around the protosolar core. This atmosphere spins faster as it slowly contracts. It rids itself of excess angular momentum by sequentially shedding gas rings from its equator. The same process repeats itself on a much smaller scale for each of the giant planets to produce their regular satellite systems. Prentice has used his unorthodox model to make a range of surprisingly accurate predictions about the Solar System. He is currently Emeritus Professor in the School of Mathematical Sciences at Monash University.[2]
Andrew Prentice was a member of the lecturing staff at Monash University, Clayton; he received a Vice-Chancellor's Award for Teaching Excellence in 2011.[3]
Predictionsedit
In 2014 the ALMA radio telescope started observing the inner regions around young stars,[4] such as HL Tauri and AS 209,
where planets were thought to be forming. To the surprise of the astronomical community ALMA found that most of these stars are encircled by sets of concentric rings, similar to those described by Prentice in 1978,[6] rather than continuous disks.
Prentice has made a long list of controversial predictions about the nature of our Solar System in an attempt to demonstrate the validity of his Modern Laplacian Theory. Critics have dismissed the theory pointing out that the convectively driven 'supersonic turbulence' proposed by Prentice is theoretically impossible and that his gas rings would be dynamically unstable,[7] but to the surprise of many of his colleagues, NASA missions have confirmed that many of his deductions from the theory were remarkably accurate. Some of his best known predictions are:[8]
In 1977, Prentice hypothesised that a rocky moon belt existed at four planetary radii from Jupiter's centre. Two years later, such a rocky ring was discovered, though closer to Jupiter than Prentice had predicted.
He predicted that Uranus had two more moons or moonlet streams than commonly thought. Nine years later, a new moon (Puck), was discovered to be orbiting Uranus, in addition to a family of nine moonlets.
In 1981, Prentice theorised that the mass of Saturn's moon Tethys was in fact 20–25% larger than the generally predicted level. Three months later, it was confirmed to be 21% larger than previously thought.
In 1989, he predicted that Neptune had four additional dark moons, at 5, 3.5, 2.5 and 1.8 radii in Neptune's equatorial plane. By the end of the year, four dark moons were discovered in Neptune's equatorial plane at 7, 3, 2.5 and 2.1 radii.
He predicted that dry ice would be the main carbon-bearing chemical on Triton. Three years later, infrared devices confirmed this.
Selected worksedit
Prentice, Andrew J. R. (2006). "Saturn's Icy Moon Rhea: A Prediction for its Bulk Chemical Composition and Physical Structure at the Time of the Cassini Spacecraft First Flyby". Publications of the Astronomical Society of Australia. 23 (1): 1–11. arXiv:astro-ph/0512115. Bibcode:2006PASA...23....1P. doi:10.1071/as05041. S2CID 55521338.
Prentice, Andrew J. R.; Jontof-Hutter, D. (2005). "Origin and bulk chemical composition of mercury". In O. Engvold (ed.). Highlights of Astronomy, Vol 13. Vol. 13. pp. 73–74.
Prentice, Andrew J. R.; Dyt, C. P. (2003). "A numerical simulation of supersonic turbulent convection relating to the formation of the Solar system". Monthly Notices of the Royal Astronomical Society. 341 (2): 644–656. Bibcode:2003MNRAS.341..644P. doi:10.1046/j.1365-8711.2003.06454.x.
Prentice, Andrew J. R.; Dyt, C. P. (2001). "A Numerical Simulation of Supersonic Turbulent Convection Relating to the Formation of the Solar System". NASA STI/Recon Technical Report N. 02 (39526).
Prentice, Andrew J. R. (1999). "Origin, bulk chemical composition and physical structure of the Galilean satellites of Jupiter: A post-Galileo analysis". Earth, Moon, and Planets. 87 (1): 11–55. Bibcode:1999EM&P...87...11P. doi:10.1023/A:1010692812892. S2CID 55834227.
Dyt, C. P.; Prentice, Andrew J. R. (1998). "A numerical simulation of supersonic thermal convection". Monthly Notices of the Royal Astronomical Society. 296 (1): 56–65. Bibcode:1998MNRAS.296...56D. doi:10.1046/j.1365-8711.1998.01240.x.
Prentice, Andrew J. R. (1996). "Origin and bulk chemical composition of the Galilean satellites and the primitive atmosphere of Jupiter: A pre-Galileo analysis". Earth, Moon, and Planets. 73 (3): 237–258. Bibcode:1996EM&P...73..237P. doi:10.1007/bf00115883. S2CID 122900208.
Prentice, Andrew J. R. (1996). "Internal structure and bulk chemical composition of Io: A pre-Galileo prediction". Physics Letters A. 213 (5–6): 253–258. Bibcode:1996PhLA..213..253P. doi:10.1016/0375-9601(96)00156-9.
Prentice, Andrew J. R. (1993). "The Origin And Composition of Pluto And Charon – Chemically Uniform Models". Proceedings Astronomical Society of Australia. 10 (3): 189–195. Bibcode:1993PASA...10..189P. doi:10.1017/S1323358000025649. S2CID 115810027.
Prentice, A. (1991). "Voyage to the Origin of the Solar-System". Search. 22 (3): 101–103.
Prentice, Andrew J. R. (1990). "Iron Silicate Fractionation and the Formation of the Inner Planets". Meteoritics. 25 (4): 399–400. Bibcode:1990Metic..25R.399P.
Prentice, Andrew J. R. (1990). "Neptune Triton – A Moon Rich in Dry Ice And Carbon". Proceedings Astronomical Society of Australia. 8 (4): 364–367. Bibcode:1990PASA....8..364P. doi:10.1017/S1323358000023742. hdl:2060/19900007359. S2CID 118280966.
Prentice, Andrew J. R. (1989). "Neptune: Predicted origin and composition of a regular satellite system". Physics Letters A. 140 (5): 265–270. Bibcode:1989PhLA..140..265P. doi:10.1016/0375-9601(89)90937-7.
Prentice, Andrew J. R. (1986). "Uranus: Predicted origin and composition of its atmosphere, moons and rings". Physics Letters A. 114 (4): 211–216. Bibcode:1986PhLA..114..211P. doi:10.1016/0375-9601(86)90209-4.
Prentice, Andrew J. R. (1984). "Formation of the saturnian system: A modern Laplacian theory". Earth, Moon, and Planets. 30 (3): 209–228. Bibcode:1984EM&P...30..209P. doi:10.1007/bf00056200. S2CID 123634348.
Prentice, Andrew J. R.; ter Haar, D. (1979). "Formation of the regular satellite systems and rings of the major planets". The Moon and the Planets. 21 (1): 43–62. Bibcode:1979M&P....21...43P. doi:10.1007/bf00897054. S2CID 122103729.
Prentice, Andrew J. R.; ter Haar, D. (1979). "Origin of the jovian ring and the galilean satellites [3]". Nature. 280 (5720): 300–302. Bibcode:1979Natur.280..300P. doi:10.1038/280300a0. S2CID 4340580.
Prentice, Andrew J. R. (1978). "Origin of the solar system – I: Gravitational contraction of the turbulent protosun and the shedding of a concentric system of gaseous laplacian rings". The Moon and the Planets. 19 (3): 341–398. Bibcode:1978M&P....19..341P. doi:10.1007/bf00898829. S2CID 123376299.
Prentice, Andrew J. R. (1976). "Supersonic Turbulent Convection, Inhomogeneities of Chemical Composition, and the Solar Neutrino Problem". Astronomy and Astrophysics. 50 (1): 59–70. Bibcode:1976A&A....50...59P.
Prentice, Andrew J. R. (1973). "On Turbulent Stress and the Structure of Young Convective Stars". Astronomy and Astrophysics. 27: 237–248. Bibcode:1973A&A....27..237P.
Referencesedit
^Prentice, A.J.R. (1978). "Origin of the solar system – I: Gravitational contraction of the turbulent protosun and the shedding of a concentric system of gaseous laplacian rings". The Moon and the Planets. 19 (3): 341–398. Bibcode:1978M&P....19..341P. doi:10.1007/bf00898829. S2CID 123376299.
^. Archived from the original on 19 March 2014. Retrieved 20 November 2013.
^"Outstanding Staff Honoured". Monash University. 26 October 2011.
^"ALMA Campaign Provides Unprecedented Views of the Birth of Planets | ALMA".
^"Safe havens for young planets". eso.org. Retrieved 4 February 2019.
^Prentice, A.J.R. (1978). "Origin of the solar system – I: Gravitational contraction of the turbulent protosun and the shedding of a concentric system of gaseous laplacian rings". The Moon and the Planets. 19 (3): 341–398. Bibcode:1978M&P....19..341P. doi:10.1007/bf00898829. S2CID 123376299.
^J. J. Monaghan (1995), "Flaws in the Modern Laplacian Theory", Earth, Moon, and Planets, 71 (1–2): 73–84, Bibcode:1995EM&P...71...73M, doi:10.1007/bf00612871, S2CID 121661431
^Journey to the origin of the Solar System (Monash Magazine article)
External linksedit
"Author Query, Results from the Astronomy Database". Retrieved 24 November 2013.
April 12, 2024
andrew, prentice, australian, mathematician, known, developing, alternative, model, planetary, formation, contrast, conventional, model, where, planetary, accretion, occurs, within, continuous, disk, according, prentice, modern, laplacian, theory, each, planet. Andrew Prentice is an Australian mathematician He is known for developing an alternative model of planetary formation In contrast to the conventional model where planetary accretion occurs within a continuous disk according to Prentice s Modern Laplacian Theory each planet accretes within a discrete circumsolar gas ring 1 Prentice s nested gas rings arise due to the effect of supersonic turbulent convection in slowing the infall of interstellar dust and gas Instead of collapsing directly to form a flat continuous disk due to turbulent stress the gas temporarily remains puffed up in a vast rotating spheroidal atmosphere around the protosolar core This atmosphere spins faster as it slowly contracts It rids itself of excess angular momentum by sequentially shedding gas rings from its equator The same process repeats itself on a much smaller scale for each of the giant planets to produce their regular satellite systems Prentice has used his unorthodox model to make a range of surprisingly accurate predictions about the Solar System He is currently Emeritus Professor in the School of Mathematical Sciences at Monash University 2 Contents 1 Lecturing style 2 Predictions 3 Selected works 4 References 5 External linksLecturing style editAndrew Prentice was a member of the lecturing staff at Monash University Clayton he received a Vice Chancellor s Award for Teaching Excellence in 2011 3 Predictions editIn 2014 the ALMA radio telescope started observing the inner regions around young stars 4 such as HL Tauri and AS 209 nbsp Circumstellar rings of AS 209 5 where planets were thought to be forming To the surprise of the astronomical community ALMA found that most of these stars are encircled by sets of concentric rings similar to those described by Prentice in 1978 6 rather than continuous disks Prentice has made a long list of controversial predictions about the nature of our Solar System in an attempt to demonstrate the validity of his Modern Laplacian Theory Critics have dismissed the theory pointing out that the convectively driven supersonic turbulence proposed by Prentice is theoretically impossible and that his gas rings would be dynamically unstable 7 but to the surprise of many of his colleagues NASA missions have confirmed that many of his deductions from the theory were remarkably accurate Some of his best known predictions are 8 In 1977 Prentice hypothesised that a rocky moon belt existed at four planetary radii from Jupiter s centre Two years later such a rocky ring was discovered though closer to Jupiter than Prentice had predicted He predicted that Uranus had two more moons or moonlet streams than commonly thought Nine years later a new moon Puck was discovered to be orbiting Uranus in addition to a family of nine moonlets In 1981 Prentice theorised that the mass of Saturn s moon Tethys was in fact 20 25 larger than the generally predicted level Three months later it was confirmed to be 21 larger than previously thought In 1989 he predicted that Neptune had four additional dark moons at 5 3 5 2 5 and 1 8 radii in Neptune s equatorial plane By the end of the year four dark moons were discovered in Neptune s equatorial plane at 7 3 2 5 and 2 1 radii He predicted that dry ice would be the main carbon bearing chemical on Triton Three years later infrared devices confirmed this Selected works editPrentice Andrew J R 2006 Saturn s Icy Moon Rhea A Prediction for its Bulk Chemical Composition and Physical Structure at the Time of the Cassini Spacecraft First Flyby Publications of the Astronomical Society of Australia 23 1 1 11 arXiv astro ph 0512115 Bibcode 2006PASA 23 1P doi 10 1071 as05041 S2CID 55521338 Prentice Andrew J R Jontof Hutter D 2005 Origin and bulk chemical composition of mercury In O Engvold ed Highlights of Astronomy Vol 13 Vol 13 pp 73 74 Prentice Andrew J R Dyt C P 2003 A numerical simulation of supersonic turbulent convection relating to the formation of the Solar system Monthly Notices of the Royal Astronomical Society 341 2 644 656 Bibcode 2003MNRAS 341 644P doi 10 1046 j 1365 8711 2003 06454 x Prentice Andrew J R Dyt C P 2001 A Numerical Simulation of Supersonic Turbulent Convection Relating to the Formation of the Solar System NASA STI Recon Technical Report N 02 39526 Prentice Andrew J R 1999 Origin bulk chemical composition and physical structure of the Galilean satellites of Jupiter A post Galileo analysis Earth Moon and Planets 87 1 11 55 Bibcode 1999EM amp P 87 11P doi 10 1023 A 1010692812892 S2CID 55834227 Dyt C P Prentice Andrew J R 1998 A numerical simulation of supersonic thermal convection Monthly Notices of the Royal Astronomical Society 296 1 56 65 Bibcode 1998MNRAS 296 56D doi 10 1046 j 1365 8711 1998 01240 x Prentice Andrew J R 1996 Origin and bulk chemical composition of the Galilean satellites and the primitive atmosphere of Jupiter A pre Galileo analysis Earth Moon and Planets 73 3 237 258 Bibcode 1996EM amp P 73 237P doi 10 1007 bf00115883 S2CID 122900208 Prentice Andrew J R 1996 Internal structure and bulk chemical composition of Io A pre Galileo prediction Physics Letters A 213 5 6 253 258 Bibcode 1996PhLA 213 253P doi 10 1016 0375 9601 96 00156 9 Prentice Andrew J R 1993 The Origin And Composition of Pluto And Charon Chemically Uniform Models Proceedings Astronomical Society of Australia 10 3 189 195 Bibcode 1993PASA 10 189P doi 10 1017 S1323358000025649 S2CID 115810027 Prentice A 1991 Voyage to the Origin of the Solar System Search 22 3 101 103 Prentice Andrew J R 1990 Iron Silicate Fractionation and the Formation of the Inner Planets Meteoritics 25 4 399 400 Bibcode 1990Metic 25R 399P Prentice Andrew J R 1990 Neptune Triton A Moon Rich in Dry Ice And Carbon Proceedings Astronomical Society of Australia 8 4 364 367 Bibcode 1990PASA 8 364P doi 10 1017 S1323358000023742 hdl 2060 19900007359 S2CID 118280966 Prentice Andrew J R 1989 Neptune Predicted origin and composition of a regular satellite system Physics Letters A 140 5 265 270 Bibcode 1989PhLA 140 265P doi 10 1016 0375 9601 89 90937 7 Prentice Andrew J R 1986 Uranus Predicted origin and composition of its atmosphere moons and rings Physics Letters A 114 4 211 216 Bibcode 1986PhLA 114 211P doi 10 1016 0375 9601 86 90209 4 Prentice Andrew J R 1984 Formation of the saturnian system A modern Laplacian theory Earth Moon and Planets 30 3 209 228 Bibcode 1984EM amp P 30 209P doi 10 1007 bf00056200 S2CID 123634348 Prentice Andrew J R ter Haar D 1979 Formation of the regular satellite systems and rings of the major planets The Moon and the Planets 21 1 43 62 Bibcode 1979M amp P 21 43P doi 10 1007 bf00897054 S2CID 122103729 Prentice Andrew J R ter Haar D 1979 Origin of the jovian ring and the galilean satellites 3 Nature 280 5720 300 302 Bibcode 1979Natur 280 300P doi 10 1038 280300a0 S2CID 4340580 Prentice Andrew J R 1978 Origin of the solar system I Gravitational contraction of the turbulent protosun and the shedding of a concentric system of gaseous laplacian rings The Moon and the Planets 19 3 341 398 Bibcode 1978M amp P 19 341P doi 10 1007 bf00898829 S2CID 123376299 Prentice Andrew J R 1976 Supersonic Turbulent Convection Inhomogeneities of Chemical Composition and the Solar Neutrino Problem Astronomy and Astrophysics 50 1 59 70 Bibcode 1976A amp A 50 59P Prentice Andrew J R 1973 On Turbulent Stress and the Structure of Young Convective Stars Astronomy and Astrophysics 27 237 248 Bibcode 1973A amp A 27 237P References edit Prentice A J R 1978 Origin of the solar system I Gravitational contraction of the turbulent protosun and the shedding of a concentric system of gaseous laplacian rings The Moon and the Planets 19 3 341 398 Bibcode 1978M amp P 19 341P doi 10 1007 bf00898829 S2CID 123376299 CSPA Staff Andrew Prentice Archived from the original on 19 March 2014 Retrieved 20 November 2013 Outstanding Staff Honoured Monash University 26 October 2011 ALMA Campaign Provides Unprecedented Views of the Birth of Planets ALMA Safe havens for young planets eso org Retrieved 4 February 2019 Prentice A J R 1978 Origin of the solar system I Gravitational contraction of the turbulent protosun and the shedding of a concentric system of gaseous laplacian rings The Moon and the Planets 19 3 341 398 Bibcode 1978M amp P 19 341P doi 10 1007 bf00898829 S2CID 123376299 J J Monaghan 1995 Flaws in the Modern Laplacian Theory Earth Moon and Planets 71 1 2 73 84 Bibcode 1995EM amp P 71 73M doi 10 1007 bf00612871 S2CID 121661431 Journey to the origin of the Solar System Monash Magazine article External links edit Author Query Results from the Astronomy Database Retrieved 24 November 2013 Retrieved from https en wikipedia org w index php title Andrew Prentice amp oldid 1216701121, wikipedia, wiki, book, books, library,
