Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A dynamical study on the habitability of terrestrial exoplanets II: The
  super Earth HD 40307 g   HARPS and it Kepler results indicate that half of solar-type stars host
planets with periods P<100 d and masses M < 30 M_E. These super Earth systems
are compact and dynamically cold. Here we investigate the stability of the
super Earth system around the K-dwarf HD40307. It could host up to six planets,
with one in the habitable zone. We analyse the system's stability using
numerical simulations from initial conditions within the observational
uncertainties. The most stable solution deviates 3.1 sigma from the published
value, with planets e and f not in resonance and planets b and c apsidally
aligned. We study the habitability of the outer planet through the
yearly-averaged insolation and black-body temperature at the pole. Both undergo
large variations because of its high eccentricity and are much more intense
than on Earth. The insolation variations are precession dominated with periods
of 40 kyr and 102 kyr for precession and obliquity if the rotation period is 3
d. A rotation period of about 1.5 d could cause extreme obliquity variations
because of capture in a Cassini state. For faster rotation rates the periods
converge to 10 kyr and 20 kyr. The large uncertainty in the precession period
does not change the overall outcome.

14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th