Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of "51Peg b-like" Planets   About one-quarter of the extrasolar giant planets discovered so far have
orbital distances smaller than 0.1 AU. These ``51Peg b-like'' planets can now
be directly characterized, as shown by the planet transiting in front the star
HD209458. We review the processes that affect their evolution.
  We apply our work to the case of HD209458b, whose radius has been recently
measured. We argue that its radius can be reproduced only when the deep
atmosphere is assumed to be unrealistically hot. When using more realistic
atmospheric temperatures, an energy source appears to be missing in order to
explain HD209458b's large size. The most likely source of energy available is
not in the planet's spin or orbit, but in the intense radiation received from
the parent star. We show that the radius of HD209458b can be reproduced if a
small fraction (~1%) of the stellar flux is transformed into kinetic energy in
the planetary atmosphere and subsequently converted to thermal energy by
dynamical processes at pressures of tens of bars.

24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics