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Secular Increase of the Astronomical Unit: a Possible Explanation in Terms of the Total Angular-Momentum Conservation Law

机译:天文单位的长期增加:关于角动量守恒定律的一种可能解释

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Wegiveanideaandorder-of-magnitudeestimationstoexplainarecentlyreportedsecularincreaseoftheAstronomicalUnit($$AU$$)byKrasinskyandBrumberg(2004,Celest.Mech.Dyn.Astron.,90,267).TheideaproposedisanalogoustotidalaccelerationintheEartha€“Moonsystem,whichisbasedonconservationofthetotalangularmomentum;weapplythisscenariototheSuna€“planetssystem.AssumingtheexistenceofsometidalinteractionsthattransfertherotationalangularmomentumoftheSun,andusingareportedvalueofthepositiveseculartrendintheAstronomicalUnit,$$displaystylefrac{d}{dt}{AU}$$$$=$$15$$pm$$4(mcy$$^{-1}$$),thesuggestedchangeintheperiodofrotationoftheSunisabout21mscy$$^{-1}$$inthecasethattheorbitsoftheeightplanetshavethesamea€?expansionrate.a€?Thisvalueissufficientlysmall,andatpresentitseemstherearenoobservationaldatathatexcludethispossibility.TheeffectsofachangeintheSuna€?smomentofinertiaisalsoinvestigated.ItispointedoutthatachangeinthemomentofinertiaduetoradiativemasslossbytheSunmayberesponsibleforthesecularincreaseof$$AU$$,iforbitala€?expansiona€?ishappeningonlyintheinner-planetssystem.AlthoughtheexistenceofsometidalinteractionsisassumedbetweentheSunandtheplanets,concretemechanismsofangular-momentumtransferarenotdiscussedinthispaper,whichremaintobepursuedasfutureinvestigations.
机译:Wegiveanideaandorder-的-magnitudeestimationstoexplainarecentlyreportedsecularincreaseoftheAstronomicalUnit($$ AU $$)byKrasinskyandBrumberg(2004,Celest.Mech.Dyn.Astron,90267)。.TheideaproposedisanalogoustotidalaccelerationintheEartha€“Moonsystem,whichisbasedonconservationofthetotalangularmomentum; weapplythisscenariototheSuna€“planetssystem.AssumingtheexistenceofsometidalinteractionsthattransfertherotationalangularmomentumoftheSun,andusingareportedvalueofthepositiveseculartrendintheAstronomicalUnit,$$ displaystylefrac {d} {dt} {AU} $$$$ = $$ 15 $$ pm $$ 4(mcy $$ ^ {-1} $$),建议在Sunis旋转周期约为21mscy $ ^ {-1} $$的情况下,如果轨道软高度行星剃掉相同的膨胀系数,则此数值足够小。 ,并提出了似乎排除了这种可能性的另一种观测数据。还研究了Suna变化的惯性作用。还指出了由于太阳辐射可能引起的惯性运动惯性变化的总变化,这是因为美元增加了$ AU $,虽然假定太阳和行星之间存在潮汐相互作用,但本文中并未讨论具体的机制,因此,不作讨论,只是为了将来的研究。

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