L06 - ReviewL02L05 1. Aristotle,Ptolemy,Copernicus,Kepler,Newton 2.Exoplanets(examples&generalproperMes

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Unformatted text preview: 1/27/12 ReviewL02L05 1.BeginningoftheModernAstronomy Aristotle,Ptolemy,Copernicus,Kepler,Newton 2.Exoplanets(examples&generalproperMes) mass,eccentricity,distancefromhoststars,numberofmembers &layout 3.DetecMonMethodsofExoplanets directimagingwithAO radialvelocitymethod (DopplerEffect,ProperMesoflight(RadiaMon&LineformaMon)) WhyPtolemy'sEpicycleModelwasagoodtheory? WhyPtolemy'sEpicycleModelwasnotagood theory? Inwhataspect,Kepler'sModelissuperiorthan Ptolemy'sModel? Then,whyNewton'sLawofMoMonsiseven greaterthanKepler'slaws? Kepler's3rdlaw(lawofharmonics) P2 = R3 wherePinyears RinAU(EarthSundistance) Itstartsfrom F = ma Newtonianform Newton's2nd lawofmoMon whereM=MassoftheSun 1 1/27/12 Let'sputitalltogether. ThegeneralproperMesofthe exoplanetarysystems. 1.Mass 2.OrbitalShape (i.e.Eccentricity) 3.DistancefromHostStar 4.Numberofmembers &Layout DetecMonMethods DirectImaging EarthAtmospheredistortsthelight pa^ernsfromsources. RadialVelocity RadiaMon&SpectralLines AOoff AOon Exoplanets:DetecMonMethod 2 1/27/12 ExoplanetDetecMonMethods IndirectMethods RadialVelocity(DopplerShia) AstrometricMeasurement TransitMethod(LightCurve) GravitaMonalMicrolensing DirectMethod DirectImaging GravitaMonalMircolensing Gravity bends space! Whatweseeare... Sharpincreasein brightness Changesinthe apparentposiMon AstrometricMeasurement Astrometry:measuringtheexact PosiMonsofcelesMalobjects. Astrometrywastheoldestmethod usedinsearchingforexoplanets. Theearliestclaimforthediscovery ofanexoplanetbyastrometrywas asearlyas1943.But,thefirst confirmaMoncameoutin2009 3 1/27/12 AstrometricMeasurement MeasurementofAngularDisplacement SmallAngleFormula sinA=a/c tanA=a/b sintan(rad)=s/d s d AstrometricMeasurement d s introducingradian s/2d=/360 360=2rad s/d= AstrometricMeasurement animportantdistanceunit:parsec Def.1parsecisadistanceatwhich1AU(EarthSundistance) subtendsanangularsizeof1arcsec. 4 1/27/12 AstrometricMeasurement AngularSeparaMon AstrometricMeasurement Examples1 Eiffeltowerisabout1000atall.Thenhow manyayoumuststandfromitinorderto coverthetowerwithyourpalm? 25 1000a a? AstrometricMeasurement Example2 TheangularsizesoftheSunandtheMoonin theskyareaboutahalfdegree(0.5).Butthe truesizeoftheSunisabout400Mmesbigger thanthetruesizeoftheMoon.Thenhowfar istheMoonfromEarth? Answer=400MmesclosertoEarththantheSun 5 1/27/12 AstrometricMeasurement Example3,ArealisMcproblem ConsideraSunlikestar,whichisorbitedbya planetwithaperiodof50years.Iftheangular separaMonofthestarandtheplanetis20 arcsec,howfarawayisthestar? Usewhatwehavelearnedsofar... InformaMoninyourhands:P,>>D? TransitMethod Kepler Mission 6 1/27/12 Quiz#1,Jan26,2012 1.PtolemyrevisedAristotle'sgeocentricmodelbyintroducing"". 2.Ptolemy'sgeocentricmodelwasagoodenoughtotoexplainalmostevery aspectsoftheplanetarymoMons.Butwhyhismodelisnota"great"theory? Brieflystatewith1sentence. 3.Kepler's1stlaw:Theorbitalpathsoftheplanetsare""withthe ""atonefocus. 4.Aplanetlocatedat3AUwillrequireapproximately""yearsto orbittheSun.ClearlyshowyourcalculaMon. 5.Wecanspeculatewhetheranexoplanetisrockyorgaseousbymeasuring its"". 6.BrieflystatethegeneralproperMes(atleastthree)oftheExoplanetarysystems. 7.WhatisthebiggestchallengeforgroundbasedobservaMons?"" 8.(T/F)TheradialvelocitymethodisadirectwaytodetectExoplanets. 9. Youobserveanobjectandgotthisspectrum.Tellmeabout thephysicalcondiMonsaboutthisobject. 10.DopplerEffect:Whenthelightsourceismovingtowardtoanobserver,the observersees""wavelengththannormal. 1.PtolemyrevisedAristotle'sgeocentricmodelby introducing"". 2.Ptolemy'sgeocentricmodelwasagoodenoughtoto explainalmosteveryaspectsoftheplanetarymoMons. Butwhyhismodelisnota"great"theory?Brieflystate with1sentence. 3.Kepler's1stlaw:Theorbitalpathsoftheplanetsare" "withthe""atonefocus. 4.Aplanetlocatedat3AUwillrequireapproximately" "yearstoorbittheSun.ClearlyshowyourcalculaMon. 5.Wecanspeculatewhetheranexoplanetisrockyor gaseousbymeasuringits"". 6.BrieflystatethegeneralproperMes(atleastthree)of theExoplanetarysystems. 7.Whatisthebiggestchallengeforgroundbased observaMons?"" 8.(T/F)Theradialvelocitymethodisadirectwayto detectExoplanets. 9. Youobserveanobjectandgotthis spectrum.TellmeaboutthephysicalcondiMonsabout thisobject. 10.DopplerEffect:Whenthelightsourceismoving towardtoanobserver,theobserversees"" wavelengththannormal. 7 ...
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This note was uploaded on 02/15/2012 for the course AST 1002 taught by Professor Dr.haywoodsmith,jr during the Spring '07 term at University of Florida.

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