serendipitous asteroid detections with jwst-miri · serendipity: known asteroids • picked one gto...

SerendipitousAsteroidDetectionsWithJWST-MIRI

Michael“Migo”MuellerU.Groningen(Netherlands)

LenkaHusárová,BernhardBrandlTUDelft(Netherlands)

Overview

•  JWST&MIRI– Capabilities– Timeline,deadlines

•  AsteroidSerendipity

•  Super-WISE?J

[email protected];JWST-MIRIAsteroidSerendipity

JamesWebbSpaceTelescope(JWST)

•  Infraredspaceobservatory– Aperture6.5m– Mid-infraredinstrument:MIRI– Launch:Mar2021– GTOandERSprogramsarepublic

https://jwst.stsci.edu/files/live/sites/jwst/files/home/about-jwst/history/flyers/_documents/JWST-GTO-ERS.pdf– ExpectanewGeneralObservercallnextyear,thenyearly(5—10years?!)

[email protected];JWST-MIRIAsteroidSerendipity 3

Mid-InfraredInstrument(MIRI)

•  Imaging+spectroscopy,5—28μm– Seehttps://jwst.nasa.gov/miri.htmlhttp://www.miricle.org/

– Thermalimagingofpracticallyanyasteroid…– LRS(R~100,5—12μm),MRS(R~3,000,5—28μm)

–  I’mpartoftheteam–askmeanyquestion!– MIRIsimulator:http://miri.ster.kuleuven.be/bin/view/Public/MIRISim_Public


AsteroidSerendipity

•  Asteroidsareverybright@MIRàMIRIwillseemany,likeitornot!

•  Butthen,FOVisonly74”x113”.•  Notasurveytelescope,butwillgoMUCHdeeperthan,say,WISE.

•  Datapublicafteroneyear.ButhowmanyasteroidswillMIRIsee?


SIMO

•  “SimultaneousImagerMRSObservations”

•  DuringMRSobs,canimageanearbyfieldatzerooverhead(!).

•  Pleaseusefilter1280W!(bestforasteroids)


SIMO





Serendipity:KnownAsteroids

•  PickedoneGTOprogram(#1282,targetingdebrisdisks)with55MIRI-MRSobservations

•  Fortimeswhenobservable:checkwhichasteroids(ifany)areinsideMIRIMFOV– https://ssd.jpl.nasa.gov/x/ispy.html– MIRIsim



•  PickedoneGTOprogram(#1282,targetingdebrisdisks)with55MIRI-MRSobservations

•  Fortimeswhenobservable:checkwhichasteroids(ifany)areinsideMIRIMFOV.– Preliminaryresult:4.2%chanceofhavingacurrentlyknownasteroidinsideFOV.



– Preliminaryresult:4.2%chanceofhavingacurrentlyknownasteroidinsideFOV

•  Estimatedbrightness(NEATM),assumedpV=6%,20%

•  àMIRIsimtosimulatestreaks•  àSNR>>10inpracticallyallcases




•  Estimatedbrightness(NEATM)àMIRIsim

•  àSNR>>10inpracticallyallcases




•  Totalasteroidyield(currentlyknownMBAs):5years/(1.7hr/obs)*25%*75%*4.2%~200–  Assume:MIRIon25%oftime;MIRIM75%ofthat




•  Totalasteroidyield(currentlyknownMBAs):5years/(1.7hr/obs)*25%*75%*4.2%~200

•  Thisisnotsuper-WISE!It’snotthewholestory,either.


Serendipity:UnknownAsteroids

•  We’llseemanymoreasteroids–thosethathaven’tbeendiscovered,yet!– MIRIismuchmoresensitivetoasteroidfluxthancurrentopticalsurveys.

•  Extrapolation:we’resensitivetoallMBAsdowntoD~120m(preliminaryresult)



•  SensitivedowntoD~120m(preliminary)

[email protected];JWST-MIRIAsteroidSerendipity 16 FromDavisetal.(2002;AsteroidsIII)



•  ExtrapolatingSFD:~30e6D>120masteroids•  ~800,000ofthemknowntoday•  à~2.7%complete




•  à~2.7%complete

•  Totalyieldexpected:200/2.7%~7,500MBAs– 97%ofthesecurrentlyunknown,sub-kmsize

•  Isthissuper-WISE?


Conclusions

•  JWSTtolaunchinMar2021.MIRIisgreatforthermalwork!AnnualGOcallsstarting2020.

•  Over5yearlifetime(requirement),MIRIMdetects~200MBAsknowntoday(smallFOV)

•  Willdetect~7,000moreunknownMBAs(D<1km;highsensitivity)


Conclusions



•  Lookingintodatareductionfortrailedobservationsw/non-destructiveread-outs…


serendipitous asteroid detections with jwst-miri · serendipity: known asteroids • picked one gto...

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