Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Review of the Current Status of Follow-Up Techniques to Study Known
  Extrasolar Planets   I present a review of observational efforts to study known extrasolar planets
by methods that are complementary to the radial velocity technique. I describe
the current state of attempts to detect and characterize such planets by
astrometry, by reflected light, by thermal emission, by transit photometry, by
atmospheric transmission spectroscopy, by planet-induced chromospheric
activity, and by long-wavelength radio emission. With a few exceptions,these
efforts have yielded only upper limits. Nonetheless, the diversity and vivacity
of these pursuits has rapidly pushed many of these techniques into the realm
where realistic models of the planets and their atmospheres can now be
confronted.

33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph