Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-contrast coronagraph for ground-based imaging of Jupiter-like
  planets   We propose a high-contrast coronagraph for direct imaging of young
Jupiter-like planets orbiting nearby bright stars. The coronagraph employs a
step-transmission filter in which the intensity is apodized with a finite
number of steps of identical transmission in each step. It should be installed
on a large ground-based telescope equipped with state-of-the-art adaptive
optics systems. In that case, contrast ratios around 10^-6 should be accessible
within 0.1 arc seconds of the central star. In recent progress, a coronagraph
with circular apodizing filter has been developing, which can be used for a
ground-based telescope with central obstruction and spider structure. It is
shown that ground-based direct imaging of Jupiter-like planets is promising
with current technology.

1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci