Query : 2012A&A...542A..73B

2012A&A...542A..73B - Astronomy and Astrophysics, volume 542A, 73-73 (2012/6-1)

Interferometric mapping of the 3.3-mm continuum emission of comet 17P/Holmes after its 2007 outburst.


Abstract (from CDS):

Comet 17P/Holmes underwent a dramatic outburst in October 2007, caused by the sudden fragmentation of its nucleus and the production of a large quantity of grains scattering sunlight. We report on 90GHz continuum observations carried out with the IRAM Plateau de Bure interferometer on 27.1 and 28.2 October 2007 UT, i.e., 4-5 days after the outburst. These observations probed the thermal radiation of large dust particles, and therefore provide the best constraints on the mass in the ejecta debris. The thermal emission of the debris was modelled and coupled to a time-dependent description of their expansion after the outburst. The analysis was performed in the Fourier plane. Visibilities were computed for the two observing dates and compared to the data to measure their velocity and mass. Optical data and 250-GHz continuum measurements published in the literature were used to further constrain the dust kinematics and size distribution. Two distinct dust components in terms of kinematic properties are identified in the data. The large-velocity component, with typical velocities V0 of 50-100m/s for 1mm particles, displays a steep size distribution with a size index estimated to q=-3.7(±0.1), assuming a minimum grain size of 0.1µm. It corresponds to the fast expanding shell observed in optical images. The slowly-moving ``core'' component (V0=7-9m/s) detected near the nucleus has a size index |q|<3.4 and contains a higher proportion of large particles than the shell. The dust mass in the core is in the range 0.1-1 that of the shell. Using optical constants pertaining to porous grains (50% porosity) made of astronomical silicates mixed with water ice (48% in mass), the total dust mass Mdust injected by the outburst is estimated to 4-14x1011kg, corresponding to 3-9% the nucleus mass.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - comets: individual: glutag{Viz.comet 17P|17P/Holmes} - radio continuum: planetary systems

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3937 3
2 4C 50.11 QSO 03 59 29.74727351 +50 57 50.1618607           ~ 431 1
3 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 779 0
4 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2783 2

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