Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A genetic algorithm approach to fitting interferometric data of post-AGB
  objects: I. the case of the Ant nebula   We present GADRAD, a Python module that adopts heuristic search techniques in
the form of genetic algorithms, to efficiently model post-asymptotic giant
branch (post- AGB) disc environments. GADRAD systematically constructs the
multi-dimensional pa- parameter probability density functions that arise from
the fitting of radiative transfer and geometric models to optical
interferometric data products. The result provides unbiased descriptions of the
object's potential morphology, component luminosities and temperatures, dust
composition, disc density profiles and mass. Correlation in the estimated
parameters as well as potential degeneracies are revealed. Estimated
probability distributions of the post-AGB environment parameters provide
insight into the shaping processes that may occur in the transition from the
post-AGB to the planetary nebula phase. We test parameter recovery on simulated
artificial data products of a typical post-AGB environment. We then use GADRAD
to model the mid-infrared spectrum and visibilities of the Ant nebula (Mz3),
taken with the Very Large Telescope Interferometer's instrument MIDI. Our
result is consistent with a large dusty disc with similar parameter values to
those previously found by Chesneau et al., except for a larger dust mass of
$3.5^{+7.5}_{-2.2}\times10^{-5}$ M$_{\odot}$. The parameter confidence
intervals determined by GADRAD, can however be relied upon to impose additional
constraints on all disc and system parameters. Based on our analysis and other
considerations, we tentatively suggest that Mz3 is a pre-PN ejected during a
magnetic (polar) common envelope interaction, where the binary may or may not
have survived at the core of the nebula.

29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ