Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found -...

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Studying Herbig Ae disc evolu4on in the era of ALMA Olja Panić Royal Society Dorothy Hodgkin Fellow IoA, University of Cambridge Collaborators: M.Min (UvA Amsterdam), D. Boneberg, C. Clarke, T. Haworth (IoA Cambridge) Image credit: ESO

Transcript of Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found -...

Page 1: Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found - There is a lack of close-in giants Olja Panić, IoA Cambridge ESO San4ago 05/2016

StudyingHerbigAediscevolu4onintheeraofALMA

OljaPanićRoyalSocietyDorothyHodgkinFellow

IoA,UniversityofCambridge

Collaborators:M.Min(UvAAmsterdam),D.Boneberg,C.Clarke,T.Haworth(IoACambridge)

Imagecredit:ESO

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Trendswiththestellarmass(0.2-2.0Msun)

Johnsonetal.2010

Bowleretal.2010plotbyRibasetal.2015

-  Giantplanetsaremorefrequentlyfound-  Thereisalackofclose-ingiants

OljaPanić,IoACambridge ESOSan4ago05/2016

Page 3: Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found - There is a lack of close-in giants Olja Panić, IoA Cambridge ESO San4ago 05/2016

Trendswiththestellarmass(0.2-2.0Msun)

Johnsonetal.2010

Bowleretal.2010

-  Giantplanetsaremorefrequentlyfound-  Thereisalackofclose-ingiants

OljaPanić,IoACambridge ESOSan4ago05/2016

Page 4: Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found - There is a lack of close-in giants Olja Panić, IoA Cambridge ESO San4ago 05/2016

Trendswiththestellarmass(0.2-2.0Msun)

Johnsonetal.2010

Bowleretal.2010plotbyRibasetal.2015

-  Giantplanetsaremorefrequentlyfound-  Thereisalackofclose-ingiants

DifferentgiantplanetsàDifferentplanetarysystemarchitectures

OljaPanić,IoACambridge ESOSan4ago05/2016

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Possibleoriginsofdifferentplanetaryarchitectures:

•  Differentdispersal4mescale– dispersalhaltsplanetforma4onandmigra4on

•  Differenttemperatureevolu4on– stability,minimumcoremass,metalicity

OljaPanić,IoACambridge ESOSan4ago05/2016

Page 6: Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found - There is a lack of close-in giants Olja Panić, IoA Cambridge ESO San4ago 05/2016

Possibleoriginsofdifferentplanetaryarchitectures:

•  Differentdispersal4mescale– dispersalhaltsplanetforma4onandmigra4on

•  Differenttemperatureevolu4on– stability,minimumcoremass,metalicity

OljaPanić,IoACambridge ESOSan4ago05/2016

Howdothegasdensityandtemperatureevolveinthemidplaneofdiscsaround

intermediate-massstars?

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HerbigAediscs–observa4onalclassifica4on

GroupI–flaredGroupII–flatMeeusetal.2001Thedichotomyisrecentlychallenged(Maaskantetal.2013,Menuatal.2015)

illustra4onfromDullemond&Dominik2005

HigherT LowerT

OljaPanić,IoACambridge ESOSan4ago05/2016

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Disctemperaturestructure–irradia4vehea4ng

Stellarirradia4on

Dustabsorbsandre-radiatesstarlight

WeobtainaTmid

Westartbyassumingadiscstructure(incl.scaleheightforeachgrainsize)andobtainthetemperature...

OljaPanić,IoACambridge ESOSan4ago05/2016

Page 9: Studying Herbig Ae disc evolu4on in the era of ALMA · - Giant planets are more frequently found - There is a lack of close-in giants Olja Panić, IoA Cambridge ESO San4ago 05/2016

Disctemperaturestructure–irradia4vehea4ng

Stellarirradia4on

Dustabsorbsstarlightandre-radiatesit

WeobtainanewTmid

AnewTmidimpliesadifferentver4calstructure!Repeatun4lthesolu4onisfullyselfconsistent:Tmid(assumed)=Tmid(calculated)-  MCMax;Minetal.2009

OljaPanić,IoACambridge ESOSan4ago05/2016

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Thefiducialmodel:•  Atypestar,Teff=10000K,Mstar=2Msun•  DiscfromRin=0.24AUtoRout=500AU•  Dustpopula4onfromamin=0.01umtoamax=1mm,slope

-3.5•  Surfacedensitydistribu4onslopepow=-1•  Mgas=0.01Mstar,Mdust=0.01Mgas

Wevarydiscproper4es:Mgas,Mdust,amin,amax,pow,RinWefixthestellarproper4es(assumethattdisc<tpremainsequence)

Alsovariedintandem

Howdoesthediscevolu4onaffectthemidplane?

OljaPanić,IoACambridge ESOSan4ago05/2016

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Thefiducialmodel:•  Atypestar,Teff=10000K,Mstar=2Msun•  DiscfromRin=0.24AUtoRout=500AU•  Dustpopula4onfromamin=0.01umtoamax=1mm,slope

-3.5•  Surfacedensitydistribu4onslopepow=-1•  Mgas=0.01Mstar,Mdust=0.01Mgas

Wevarydiscproper4es:Mgas,Mdust,amin,amax,pow,RinWefixthestellarproper4es(assumethattdisc<tpremainsequence)

Alsovariedintandem

Howdoesthediscevolu4onaffectthemidplane?

Result:Mgasandaminarecrucialforirradia4vehea4ng

OljaPanić,IoACambridge ESOSan4ago05/2016

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Lossofgas(photoevapora4on)sejlesdiscs-anewalterna4vetothegraingrowthparadigm

Gasevolu4on,Panic&Min(subm.)

Dustevolu4on,Dullemond&Dominik2004

OljaPanić,IoACambridge ESOSan4ago05/2016

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Gaslosschangesthetemperatureandcomposi4onofthemidplane

OljaPanić,IoACambridge ESOSan4ago05/2016

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Removingthesmallestdust

Addinglargerdust

Temperaturedependenceondustsize-Tdecreasesasthesmallestgrainsareremoved

(e.g.inphotoevapora4veflows)

OljaPanić,IoACambridge ESOSan4ago05/2016

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Removingthesmallestdust

Addinglargerdust

Temperaturedependenceondustsize-Tisnotaffectedasthelargegrainsgrow

OljaPanić,IoACambridge ESOSan4ago05/2016

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Whatifdiscslive5-10Myr?Thestarchanges...

OljaPanić,IoACambridge ESOSan4ago05/2016

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Intermediate-massstarsbecomebrighterandhojerduringp.m.s.Wefollowa2Msunstaralongthep.m.s.andselfconsistentlycalculatedustsejlingandhea4ngofthedisc(discproper4esfixed)

vanBoekeletal.(2005)-tracksfromSiessetal.2000

Howdoesthestellarevolu4onaffectthediscmidplane?

OljaPanić,IoACambridge ESOSan4ago05/2016

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Throughoutthep.m.s.theintermediatemassstarskeeptheirdiscswarm

fulllines:Mdisc=1%Mstardashed:Mdisc=0.1%Mstar

OljaPanić,IoACambridge ESOSan4ago05/2016

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Whathavewelearnt?

•  HerbigAediscsofferagreatopportunitytounderstandgiantexoplanets

•  Sejling:Gaslossisanewalterna4vetodustgrowth•  GiantplanetsaroundintermediatemassstarshaveformedofwarmerandCO-richergasthanthosearoundlow-massstars

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TheFuture:WerecentlyobtainedALMAobserva4onsof9HerbigAediscsinCycle3(Band6,C18O,highsensi4vity,project50%complete).SeetalkbyBonebergforanexamplehowgasmassesareconstrainedfromsuchobserva4ons.

StudyingHerbigAediscevolu4onintheeraofALMA

OljaPanić,IoACambridge ESOSan4ago05/2016


A TALE OF TWO HERBIG Ae STARS, MWC 275 AND AB …

A TALE OF TWO HERBIG Ae STARS, MWC 275 AND AB …

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