Molecule sublimation as a tracer of protostellar accretion
نویسندگان
چکیده
منابع مشابه
Theory of Protostellar Accretion
This paper reviews current theoretical work on the various stages of accretion in protostars, and the relationship of these ideal stages to the spectral classes of observed protostellar systems. I discuss scaling relationships that have been obtained for models of pre-stellar cores as they evolve by ambipolar diffusion toward a central singularity, and expectations for the dynamical evolution a...
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Accretion rates of order 10−8 M⊙yr are observed in young protostars of approximately a solar mass with evidence of circumstellar disks. The accretion rate is significantly lower for protostars of smaller mass, approximately proportional to the second power of the stellar mass, Ṁaccr ∝ M2. The traditional view is that the observed accretion is the consequence of the angular momentum transport in...
متن کاملThe Burst Mode of Protostellar Accretion
We present new numerical simulations in the thin-disk approximation which characterize the burst mode of protostellar accretion. The burst mode begins upon the formation of a centrifugally balanced disk around a newly formed protostar. It is comprised of prolonged quiescent periods of low accretion rate (typically . 10M⊙ yr ) which are punctuated by intense bursts of accretion (typically & 10M⊙...
متن کاملRadiation Induced Warping of Protostellar Accretion Disks
We examine the consequences of radiatively driven warping of accretion disks surrounding pre-main-sequence stars. These disks are stable against warping if the luminosity arises from a steady accretion flow, but are unstable at late times when the intrinsic luminosity of the star overwhelms that provided by the disk. Warps can be excited for stars with luminosities of around 10L⊙ or greater, wi...
متن کاملDust Evolution in Protostellar Accretion Disks
We calculated the collapse of a / r 2 density peaked, slowly rotating molecular cloud core by 2D numerical radiation hydrodynamical simulations. The dynamics of the dust grains is calculated applying a multicomponent uid model. Acceleration by the radiation eld, coupling to the gas component by dynamical friction, coagulation and shattering of the grains is included. Relative velocities between...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2015
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201425317