vvvvvv°v2155 - university of cambridge

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PublishedHas:HMatthewsOHBLOHKennedyOHGLHOHSibthorpeOHBLOHBoothOHMLOHWyattOHMLHOH

BroekhovenNFieneOHHLOHMacintoshOHBLHandHMaroisOHCLHfmRáOHApJOH78mOH97

/arvInfraredvandvSubmillimetrevImagingvofv°Rv2155MarkvKooth3vPontificiavUniversidadvqatólicavdevqhile

markbooth~cantabTnet

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qombiningvthev°erschelvdatavwithvpreviousvobservationsvatvothervwavelengthsvwevfindvthevS;>vofvthevdiscvtovbevfitvbyvtwovnarrowvcomponentsvEseevfigurevADTvThisvseemsvtovcontradictvthevlargevradialvdistributionvofvthevdiscvseenvinvthevresolvedvimagesTv°owever3vthevextentvofvthevimagesvinvbothvthev°erschelvandvSpitzervdatavallowsvusvtovfitvanvS;>vatvmultiplevradiivEseevfigurevLDTvThisvshowsvthevdistinctionvbetweenvthevcoldvplanetesimalvbelt3vwhichvdecreasesvinvtemperaturevwithvradius3vandvthevblowoutvhalo3vwhichvactuallyvincreasesvinvtemperaturevwithvradiusvsincevsmallervEhotterDvgrainsvarevonvmoreveccentricvorbitsT

Wevobservedv°Rv2155vwithv6LM6vduringvqyclevzvatvbandv1vE21zvµmDvforvavtotalvtimevofvLT1vhoursvandvusingvbetweenv4AvandvW1vantennasTvThevimagevproducedvfromvourvdatavEfigurev0DvshowsvnovsignificantvemissionTv6nyvbrightvclumpsvinvthevdiscvcausedvbyveTgTvplanetaryvresonancesvwouldvhavevshownvupv

andvsovthisvshowsvthevdiscvtovbe5smoothU5By5working5directly5on5the5visibilities5we5see5that5there5is5some5signal5in5the5dataU5Here5we5have5azimuthally5averaged5and5deprojected5the5visibilitiesU5By5comparing5the5data5to5models5it5is5possible5to5constrain5the5inner5edge5and5width5of5the5discU5Figure5W5shows5the5real5component5of5the5visibilities5for5models5with5an5inner5edge5at5)((5AU5and5a5varying5outer5edgeU5Clearly5a5disc5as5narrow5as5that5used5in5Su5et5alU5dq((9v5and5Matthews5et5alU5dq()xv5does5not5fit5the5data5and5a5wider5planetesimal5belt5is5requiredU5Figure5T5shows5the5imaginary5component5of5the5visibilities5for5models5with5different5clump5propertiesU5Unless5otherwise5notedf5the5models5have5a5clump5of5diameter5W(5AU5that5comprises5-(w5of5the5total5flux5of5the5discU5Since5the5obsrved5points5are5close5to5the5xFaxisf5this5shows5that5the5disc5is5primarily5smooth5and5only5faint5or5small5clumps5are5consistent5with5the5dataU5We5plan5on5running5a5large5grid5of5these5parameters5to5fully5constrain5the5properties5of5the5discU

°Rv2155vwasvalsovobservedvasvpartvofvthevJqMTvLegacyvSurveyJvSqUK6)WvObservationsvofvNearbyvStarsvESONSDTvThevdiscvisvclearlyvresolvedvatv20zvµmvEfigurev2Dvshowingvthatvthevplanetesimalvdiscvcomponentvmustvbevmuchvlargervthanvwasvpreviouslyvthoughtv)vpreliminaryv±aussianvfittingvshowsvemissionvoutvtov~µzzv6UTvUnlikevwithvthev°erschelvobservations3vatvthesevwavelengthsvthevemissionvshouldvbevcomingventirelyvfromvthevplanetesimalvbeltvandvnotvfromvblowoutvgrainsTvThisvisvavveryvlargevextentvcomparedvtov0zv6UvedgevofvthevclassicalvKuipervbeltvinvourvownvSolarvSystem3vwhichvraisesvquestionsvaboutvhowvthevplanetesimalsvcouldvhavevformedvsovfarvout3valthoughvthevprotoplanetaryvdiscvofvthisvsystemvclearlyvmustvhavevbeenvlargervthanvthatvofvourvownvSolarvSystemvgivenvthevNvJupitervmassvplanetsvinvthevsystemTvv

Collaborators:HWayneHHollandOHBrendaHMatthewsHandHtheHSONSHJLSHTeam

Collaborators:HRafaelHBrahmOHAndrésHJordánOHAntonioHHalesOHPabloHRománOHSimonHCasassusOH

NeilHPhilipsOHBillHDentOHJorgeHCuadraOHFrancoisHMénardHandHDenisHBarkats

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°Rv2155visvwellvknownvforvbeingvthevonlyvstarvtovhostvmultiplevplanetsvdiscov)eredvthroughvdirectvimagingvEseevfigurev4:vMaroisvetvalTvWzz23vWz4zDTv°Rv2155valsov

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Wevobservedv°Rv2155vwithvthev°erschelvSpacevObservatoryvforv0T4vhoursvwithvP6qSv1zx4µz3vLTL0vhoursvwithvP6qSv4zzx4µzvandvzTAvhoursvwithvSPIR;TvThevobservationsvarevshownvinvfigurevWTvModellingvofvthevimagevofvthisvdiscvshowsvitvtovconsistvofvavplanetesimalvbeltvbetweenv4zzvandvA4zv6Uvandvavhalovofvgrainsvgoingvoutvtov~Wzzzv6U3vbroadlyvinvagreementvwithvthevSuvetvalTvEWzz5DvmodelTvWevmeasurevthevinclinationvtovbevWµ±A°vfromvface)onvandvthevpositionvanglevisvµL°v;vofvNTv

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