hiroshi imai confidential (kagoshima university) jun-ichi ......11.85μm image (lagadec et al. 2011)...
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11.85μm image(Lagadec et al. 2011)
VLBI Consortium Symposium on 2018 December 1, Kumamoto University
W43A:shapingtheenvelopeofanAGBwithacollimatedjet
HiroshiImai(KagoshimaUniversity)Jun-ichiNakashima(UralFederalUniversity)GaborOrosz(UniversityofTasmania)BoscoYung(NicolausCopernicusAstronomicalCentre)
José-FranciscoGoméz(CSIC/IAA)
DanielTafoya(NAOJ/EA-ARC)
Confidential
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TransitionphasefromAGBtopost-AGBstar,fromsphericalsymmetricto
asymmetriccircumstellarenvelope
✦ When / how is a water fountain launched?
✦ Which kind of star becomes a host of a water fountain?
Egg Nebula (post-AGB star) ⓒ NASA
Betelgeuse (Mira variable) ⓒ NASA
W43A(OH/IR star, water fountain)Deguchi et al. 2007
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Waterfountain:highly-collimatedstellarmolecularjettracedbyH2Omaseremission
• Vexp (H2O)(>100km/s)>>Vexp (OH)(10ー30km/s)• Veryshortdynamicaltimescale(?):<100years• Veryhighmasslossrate(?): dM/dt>10-5Msunyr-1
H2O and OH masers in W43A (Imai et al. 2002)
SPITZER/GLIMPSE image around W43A (Deguchi et al. 2007)
11.85μm image(Lagadec et al. 2011)
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Theoriginsofthejets:doublestarsorsinglestar?
• trueandwholemorpho-kinematicalstructuresofstellarjets inCOemission
• evolutionofthestructures
• masslossratesofthejets
W43A(Imai et al. 2008)
• H2O: jet• 1612 MHz OH:
envelope• SiO: torus
• CentralstellarsystemprobablyunresolvedevenwithALMACycle-6beam(~20mas)
• Centraltorus wasmarginallyresolvedwithALMACycle-4beam(~40mas)
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Whatseenin12COJ=2à1emission
• Intermediatevelocitycomponents– AlongthemajoraxisofaMIRcavity
– Consistentwithlow-velocitycomponentsofH2Omasers
11.85μm image(Lagadec et al. 2011)
Confidential
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EvolutionoftheW43Ajet
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Previousprecessingjetmodel
• Precessionperiod~55years• Precessionangleamplitude~5°• Gasbulletswithballisticmotionsfromthecentralstarand
interactionswithambientenvelope
Imai et al. 2002, 2005
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Wrong precessingjetmodelbyImaietal.(2002)
Chongetal.(2015)
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AnewmodelofH2Omaserexcitationregion(Chongetal.2015)
• Bipolar cavity formed by past jet ejection• New interaction of newly ejected jet
at the cavity wall• Periodic pattern of maser region
produced by discontinuous ejection of jet or envelope
11.8 μm emission from a bipolar cavity of W43A(Lagadec et al. 2011)
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Ballistic bow shock model• Formalization (Ostriker 2001)• Simulations (Lee et al. 2001)
steady v.s pulsed jets• Application to water fountain jet to
explain directions of maser motions and thickness of maser distribution
(Orosz et al. 2017 in prep.)
Steady jet
Pulsed jet
Jetwithalargeopeningangle
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Fast,decelerating,small-precessingjetmodelTafoyaetal.(inpreparation)
Fastest components close to the central system
IRAS 16342-3814
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AnticorrelationbetweenCOanddustcontinuumemissionregions
Confidential
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Periodicoutburstsofthejet
Ejectionperiod:P=5—7years
Confidential
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Tracingtheco-evolutionofacollimatedstellarjetandequatorialtorus/flow
• FirstoutburstinW43A~60yearsago
• Interactioneventbetweenacompactstellarobjectandatorusfollowedbyajetonashorttimescale
• Binarysystemscenariomayproducetheinteractioneventandexplain(multiple)discretemassejection.
• TheinteractioneventmayoccurinAGBphase.
Statisticalstudyisnecessary.Mappingthewholeenvelope/torusiscrucial. Data point of W43A has been just determined.
⭐W43A
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FutureperspectivesFLASHING
Finest Legacy Acquisitions of SiO and H2O masers Ignitions by Nobeyama Generation
• Episodicoutbursts• Periodicity• Evolution• devolution
First observations on 2018 December 1Simultaneous observations of SiO and H2O masers with new quasi-optics derived by HINOTORI
(Hybrid Installation Project in Nobeyama, Triple-band Oriented)