Sunday, September 11, 2016

ALMA Observations of HD141569's Circumstellar Disk

ALMA Observations of HD141569's Circumstellar Disk


White et al


We present ALMA band 7 (345 GHz) continuum and 12CO(J = 3-2) observations of the circumstellar disk surrounding HD141569. At an age of about 5 Myr, the disk has a complex morphology that may be best interpreted as a nascent debris system with gas. Our 870 μm ALMA continuum observations resolve a dust disk out to approximately 56 au from the star (assuming a distance of 116 pc) with 0."38 resolution and 0.07 mJy beam−1 sensitivity. We measure a continuum flux density for this inner material of 3.8±0.4 mJy (including calibration uncertainties). The 12CO(3-2) gas is resolved kinematically and spatially from about 30 to 210 au. The integrated 12CO(3-2) line flux density is 15.7±1.6 Jy km s−1. We estimate the mass of the millimeter debris and 12CO(3-2) gas to be ≳0.04 M⊕ and ∼2×10−3 M⊕, respectively. If the millimeter grains are part of a collisional cascade, then we infer that the inner disk (<50 50="" 53.4="" a="" an="" and="" around="" assumptions.="" au="" be="" blockquote="" can="" centered="" clearing="" contained="" density="" depending="" discuss="" disk="" distribution="" formation.="" gas="" generation.="" has="" hd141569="" host="" i="" if="" in="" inclination="" is="" it="" km="" less="" m="" may="" mcmc="" modeling="" morphology="" objects="" of="" on="" planet="" planetesimal="" radius="" reveals="" s="" second="" sin="" size="" stages="" star="" study="" system="" than="" the="" to="" used="" we="" whether="" with="" within="">

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