2003A&A...398L...1D


Query : 2003A&A...398L...1D

2003A&A...398L...1D - Astronomy and Astrophysics, volume 398, L1-4 (2003/1-4)

Planets in habitable zones: A study of the binary Gamma Cephei.

DVORAK R., PILAT-LOHINGER E., FUNK B. and FREISTETTER F.

Abstract (from CDS):

The recently discovered planetary system in the binary γ Cep was studied concerning its dynamical evolution. We confirm that the orbital parameters found by the observers are in a stable configuration. The primary aim of this study was to find stable planetary orbits in a habitable region in this system, which consists of a double star (a=21.36AU) and a relatively close (a=2.15AU) massive (1.7mjupsini) planet. We did straightforward numerical integrations of the equations of motion in different dynamical models and determined the stability regions for a fictitious massless planet in the interval of the semimajor axis 0.5AU<a<1.85AU around the more massive primary. To confirm the results we used the Fast Lyapunov Indicators (FLI) in separate computations, which are a common tool for determining the chaoticity of an orbit. Both results are in good agreement and unveiled a small island of stable motions close to 1 AU up to an inclination of about 15° (which corresponds to the 3:1 mean motion resonance between the two planets). Additionally we computed the orbits of earthlike planets (up to 90 earthmasses) in the small stable island and found out, that there exists a small window of stable orbits on the inner edge of the habitable zone in γ Cep even for massive planets.

Abstract Copyright:

Journal keyword(s): stars: individual: γ Cep - stars: planetary systems - habitable zones

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 13445b Pl 02 10 25.9181700303 -50 49 25.465181208           ~ 102 1
2 HD 13445 PM* 02 10 25.9181700303 -50 49 25.465181208   6.945 6.117     K1.5V 450 1
3 * rho01 Cnc b Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 258 1
4 * rho01 Cnc d Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 155 1
5 * rho01 Cnc c Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 143 1
6 * rho01 Cnc EB* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1103 1
7 * tau Boo Ro* 13 47 15.7381720026 +17 27 24.809555600 5.02 4.98 4.49 4.09 3.85 F7IV-V 977 1
8 * tau Boo b Pl 13 47 15.7381720026 +17 27 24.809555600           ~ 280 1
9 * 16 Cyg B PM* 19 41 51.9726777456 +50 31 03.089030916 7.07 6.86 6.20 5.76 5.42 G3V 878 1
10 * 16 Cyg Bb Pl 19 41 51.9726777456 +50 31 03.089030916           ~ 126 1
11 * gam Cep b Pl 23 39 20.9104133784 +77 37 56.510781384           ~ 82 1
12 * gam Cep SB* 23 39 20.9104133784 +77 37 56.510781384 5.190 4.250   2.6   K1III-IVCN1 594 1

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2023.11.30-12:45:52

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