vvvvvv°v2155 - University of Cambridge
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qU Herschel PublishedHas:HMatthewsOHBLOHKennedyOHGLHOHSibthorpeOHBLOHBoothOHMLOHWyattOHMLHOH BroekhovenNFieneOHHLOHMacintoshOHBLHandHMaroisOHCLHfmRáOHApJOH78mOH97 /arvInfraredvandvSubmillimetrevImagingvofv°Rv2155 MarkvKooth3vPontificiavUniversidadvqatólicavdevqhile markbooth~cantabTnet Marois et alU q((8f Sciencef %qqf)%x8 Marois et alU q()(f Naturef xW8f )(8( Su et alU q((9f ApJf T(-f %)x qombiningvthev°erschelvdatavwithvpreviousvobservationsvatvotherv wavelengthsvwevfindvthevS;>vofvthevdiscvtovbevfitvbyvtwovnarrowv componentsvEseevfigurevADTvThisvseemsvtovcontradictvthevlargevradialv distributionvofvthevdiscvseenvinvthevresolvedvimagesTv°owever3vthev extentvofvthevimagesvinvbothvthev°erschelvandvSpitzervdatavallowsvusvtov fitvanvS;>vatvmultiplevradiivEseevfigurevLDTvThisvshowsvthevdistinctionv betweenvthevcoldvplanetesimalvbelt3vwhichvdecreasesvinvtemperaturev withvradius3vandvthevblowoutvhalo3vwhichvactuallyvincreasesvinv temperaturevwithvradiusvsincevsmallervEhotterDvgrainsvarevonvmorev eccentricvorbitsT Wevobservedv°Rv2155vwithv6LM6vduringvqyclevzvatvbandv1vE21zvμmDvforvav totalvtimevofvLT1vhoursvandvusingvbetweenv4AvandvW1vantennasTvThevimagev producedvfromvourvdatavEfigurev0DvshowsvnovsignificantvemissionTv6nyvbrightv clumpsvinvthevdiscvcausedvbyveTgTvplanetaryvresonancesvwouldvhavevshownvupv andvsovthisvshowsvthevdiscvtovbe smoothU By working directly on the visibilities we see that there is some signal in the dataU Here we have azimuthally averaged and deprojected the visibilitiesU By comparing the data to models it is possible to constrain the inner edge and width of the discU Figure W shows the real component of the visibilities for models with an inner edge at )(( AU and a varying outer edgeU Clearly a disc as narrow as that used in Su et alU dq((9v and Matthews et alU dq()xv does not fit the data and a wider planetesimal belt is requiredU Figure T shows the imaginary component of the visibilities for models with different clump propertiesU Unless otherwise notedf the models have a clump of diameter W( AU that comprises -(w of the total flux of the discU Since the obsrved points are close to the xFaxisf this shows that the disc is primarily smooth and only faint or small clumps are consistent with the dataU We plan on running a large grid of these parameters to fully constrain the properties of the discU °Rv2155vwasvalsovobservedvasvpartvofvthevJqMTvLegacyvSurveyJvSqUK6)Wv ObservationsvofvNearbyvStarsvESONSDTvThevdiscvisvclearlyvresolvedvatv20zvμmv Efigurev2Dvshowingvthatvthevplanetesimalvdiscvcomponentvmustvbevmuchvlargerv thanvwasvpreviouslyvthoughtv)vpreliminaryv±aussianvfittingvshowsvemissionvoutv tov~µzzv6UTvUnlikevwithvthev°erschelvobservations3vatvthesevwavelengthsvthev emissionvshouldvbevcomingventirelyvfromvthevplanetesimalvbeltvandvnotvfromv blowoutvgrainsTvThisvisvavveryvlargevextentvcomparedvtov0zv6Uvedgevofvthev classicalvKuipervbeltvinvourvownvSolarvSystem3vwhichvraisesvquestionsvaboutv howvthevplanetesimalsvcouldvhavevformedvsovfarvout3valthoughvthev protoplanetaryvdiscvofvthisvsystemvclearlyvmustvhavevbeenvlargervthanvthatvofv ourvownvSolarvSystemvgivenvthevNvJupitervmassvplanetsvinvthevsystemTvv Collaborators:HWayneHHollandOHBrendaHMatthewsHandHtheHSONSHJLSHTeam Collaborators:HRafaelHBrahmOHAndrésHJordánOHAntonioHHalesOHPabloHRománOHSimonHCasassusOH NeilHPhilipsOHBillHDentOHJorgeHCuadraOHFrancoisHMénardHandHDenisHBarkats FigU ) FigU q FigU % FigU x FigU - FigU W FigU 8 FigU T °Rv2155visvwellvknownvforvbeingvthevonlyvstarvtovhostvmultiplevplanetsvdiscov) eredvthroughvdirectvimagingvEseevfigurev4:vMaroisvetvalTvWzz23vWz4zDTv°Rv2155valsov hostsvavdebrisvdiscvfirstvdiscoveredvbyvIR6STvThisvdiscvwasvone of the few resolved by Spitzer showing that dust is present out to a few thousand AU dSu et alU q((9vU The Spitzer data also showed that there must be multiple components to the dust both inside and outside the orbits of the planetsU Wevobservedv°Rv2155vwithvthev°erschelvSpacevObservatoryvforv0T4v hoursvwithvP6qSv1zx4µz3vLTL0vhoursvwithvP6qSv4zzx4µzvandvzTAvhoursv withvSPIR;TvThevobservationsvarevshownvinvfigurevWTvModellingvofvthev imagevofvthisvdiscvshowsvitvtovconsistvofvavplanetesimalvbeltvbetweenv 4zzvandvA4zv6Uvandvavhalovofvgrainsvgoingvoutvtov~Wzzzv6U3vbroadlyvinv agreementvwithvthevSuvetvalTvEWzz5DvmodelTvWevmeasurevthevinclinationv tovbevWµ±A°vfromvface)onvandvthevpositionvanglevisvµL°v;vofvNTv
Transcript of vvvvvv°v2155 - University of Cambridge
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PublishedHas:HMatthewsOHBLOHKennedyOHGLHOHSibthorpeOHBLOHBoothOHMLOHWyattOHMLHOH
BroekhovenNFieneOHHLOHMacintoshOHBLHandHMaroisOHCLHfmRáOHApJOH78mOH97
/arvInfraredvandvSubmillimetrevImagingvofv°Rv2155MarkvKooth3vPontificiavUniversidadvqatólicavdevqhile
markbooth~cantabTnet
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andvsovthisvshowsvthevdiscvtovbe5smoothU5By5working5directly5on5the5visibilities5we5see5that5there5is5some5signal5in5the5dataU5Here5we5have5azimuthally5averaged5and5deprojected5the5visibilitiesU5By5comparing5the5data5to5models5it5is5possible5to5constrain5the5inner5edge5and5width5of5the5discU5Figure5W5shows5the5real5component5of5the5visibilities5for5models5with5an5inner5edge5at5)((5AU5and5a5varying5outer5edgeU5Clearly5a5disc5as5narrow5as5that5used5in5Su5et5alU5dq((9v5and5Matthews5et5alU5dq()xv5does5not5fit5the5data5and5a5wider5planetesimal5belt5is5requiredU5Figure5T5shows5the5imaginary5component5of5the5visibilities5for5models5with5different5clump5propertiesU5Unless5otherwise5notedf5the5models5have5a5clump5of5diameter5W(5AU5that5comprises5-(w5of5the5total5flux5of5the5discU5Since5the5obsrved5points5are5close5to5the5xFaxisf5this5shows5that5the5disc5is5primarily5smooth5and5only5faint5or5small5clumps5are5consistent5with5the5dataU5We5plan5on5running5a5large5grid5of5these5parameters5to5fully5constrain5the5properties5of5the5discU
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Collaborators:HWayneHHollandOHBrendaHMatthewsHandHtheHSONSHJLSHTeam
Collaborators:HRafaelHBrahmOHAndrésHJordánOHAntonioHHalesOHPabloHRománOHSimonHCasassusOH
NeilHPhilipsOHBillHDentOHJorgeHCuadraOHFrancoisHMénardHandHDenisHBarkats
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°Rv2155visvwellvknownvforvbeingvthevonlyvstarvtovhostvmultiplevplanetsvdiscov)eredvthroughvdirectvimagingvEseevfigurev4:vMaroisvetvalTvWzz23vWz4zDTv°Rv2155valsov
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