ALMA OBSERVATIONS OF HD 141569%26apos;s CIRCUMSTELLAR DISK

作者：White J A; Boley A C; Hughes A M; Flaherty K M; Ford E; Wilner D; Corder S; Payne M

来源：Astrophysical Journal, 2016, 829(1): 6.

DOI：10.3847/0004-637X/829/1/6

• circumstellar matter
• planetary systems
• stars: individual (HD 141569)
• submillimeter: planetary systems

We present ALMA band 7 (345 GHz) continuum and (CO)-C-12(J = 3-2) observations of the circumstellar disk surrounding HD 141569. 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 mu m 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 (CO)-C-12(3-2) gas is resolved kinematically and spatially from about 30 to 210 au. The integrated (CO)-C-12(3-2) line flux density is 15.7 +/- 1.6 Jy kms(-1). We estimate the mass of the millimeter debris and (CO)-C-12(3-2) gas to be greater than or similar to 0.04 M-circle plus and similar to 2 x 10(-3) M-circle plus respectively. If the millimeter grains are part of a collisional cascade, then we infer that the inner disk (<50 au) has similar to 160 M-circle plus contained within objects less than 50 km in radius, depending on the planetesimal size distribution and density assumptions. Markov Chain Monte Carlo modeling of the system reveals a disk morphology with an inclination of 53 degrees.4 centered around an M = 2.39M(circle dot) Me host star (Msin(i) = 1.92. M-circle dot). We discuss whether the gas in HD 141569's disk may be second generation. If it is, the system can be used to study the clearing stages of planet formation.

• 出版日期2016-9-20