Download - The Cradle of Life SWG - ASTRON · Cradle-of-Life science goals and observing modes are very diverse, —> multiple KSPs conceivable • 1. young stellar cluster deep ﬁeld to map

SKANLsciencemeeting,2018May24 Dwingeloo

TheCradleofLifeSWGMatthijsvanderWiel

currentSWGchairs:IzaskunJimenez-Serra,DougJohnstone

MatthijsvanderWiel(ASTRON,NL)2018-05-24SKANLSciencemeeting,ASTRONslide/8

CradleofLifeSWG:fourthemes

1. howdoesplanetformationstart?

2. Howdidthefirstprebioticcompoundsform?

3. whatareexoplanetslike?

4. SETI:findsignalsfromtechnologicalcivilizations

�2


theCradleofLifeSWGmembers

+40associatemembers,includingMichielHogerheijde,(Leiden/Amsterdam)

�3


recenthighlights(1)

• radioemissionfromexoplanets:30–70MHzwithLOFAR Turner,Grießmeier,Zarka&Vasylieva(in"PlanetaryRadioEmissionsVIII”,2017)

•developedpipelinetoflagrfi,calibratetime-freqresponse,searchforburstyexoplanetsignal

•nodetectionyet..butcontinuetostackexposures..

�4


recenthighlights(2)

• ‘Breakthroughlisten’projectusedGreenBankTelescope(L,S,C,X-bands)tosearchforweakradioemissionfrom1I/′Oumuamua,asolarsystemobjectofinterstellaroriginEnruiquez,Siemion,Lazio,etal.(2018,subm.)

• theyfoundnothing,butweresensitivetoa0.08Wtransmitter

�5

interstellarasteroid1I/′Oumuamua(imagecredit:ESO)


CoLscienceplans(withSKAprecursorsandpathfinders)

• ongoingJVLAsurveyofOphiuchusAstarformingregionatXband(10GHz),beam~0.3” [Coutensetal,inprep.]

• continuinghuntforlong-wavelengthradiosignalfromexoplanets[Zarka,Grießmeier,etal.]

• theory/simulations:

• radiativetransfermodelsofthermaldustgrains

• astrochemicalmodelscoupledwith(evolved)protoplanetarydisks:forexampleformamide(NH2CHO),Quenard&Jimenez-Serra

�6


CoLSWGconnectingtofutureKeySciencePrograms

Cradle-of-Lifesciencegoalsandobservingmodesareverydiverse,

—>multipleKSPsconceivable

• 1.youngstellarclusterdeepfieldtomapdustspectralindex(cm-sizedustgrains)

• OphAstar-formingcluster,1000hoursinSKA1-mid,band5

• needangularresolution~0.04arcsectoprobesolarsystemscales(5auat120pc)

• as'additionalscience’:complexmolecules,jets(free-free),..

• 2.stars,planetsandcivilizations

• SKA1-low

• allsourceswithin25pc(2500h),selectedsamplebeyond25pc(1500h),..

• includesSETI

• goodchanceofoverlap(‘commensality’)withotherSWG:OurGalaxy,EpochofReionization,Cosmology,Transients

�7


concernsaboutSKA1capabilitiesforCradleofLifescience

• CradleofLifeSKA1-midcasesdependcriticallyonband5:

• high-frequencycut-offat13.8GHzisworkable,butnotideal

• havingband5receiversononlyhalfofthedishesreducesthespectrallinesensitivityofthetotalSKA1arraytoapointwheredetectingnewmolecularspecieswillbecomeabigchallenge

• themainsciencetheme,observinggraingrowth,needsband5at120+kmbaselines.currentlyunclearwhichdisheswillbeequipedwithband5receivers

• someoftheCradleofLifescience(e.g.,diskstructureat2cm)wouldgreatlybenefitfrombeingabletoanalyzedatainvisibilitydomain.CurrentlynotforeseenthatSKAwilldeliver(raw)visibilitydatatousers.

�8