Can there be additional rocky planets in the Habitable Zone of tight binary stars with a known gas giant?
- Author(s)
- Barbara Funk, Elke Pilat-Lohinger, Siegfried Eggl
- Abstract
Locating planets in Habitable Zones (HZs) around other stars is a growing field in contemporary astronomy. Since a large percentage of all G-M stars in the solar neighbourhood are expected to be part of binary or multiple stellar systems, investigations of whether habitable planets are likely to be discovered in such environments are of prime interest to the scientific community. As current exoplanet statistics predicts that the chances are higher to find new worlds in systems that are already known to have planets, we examine four known extrasolar planetary systems in tight binaries in order to determine their capacity to host additional habitable terrestrial planets. Those systems are Gliese 86, γ Cephei, HD 41004 and HD 196885. In the case of γ Cephei, our results suggest that only the M dwarf companion could host additional potentially habitable worlds. Neither could we identify stable, potentially habitable regions around HD 196885 A. HD 196885 B can be considered a slightly more promising target in the search for Earth-twins. Gliese 86 A turned out to be a very good candidate, assuming that the system's history has not been excessively violent. For HD 41004, we have identified admissible stable orbits for habitable planets, but those strongly depend on the parameters of the system. A more detailed investigation shows that for some initial conditions stable planetary motion is possible in the HZ of HD 41004 A. In spite of the massive companion HD 41004 Bb, we found that HD 41004 B, too, could host additional habitable worlds.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Université de recherche Paris Sciences et Lettres
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 448
- Pages
- 3797 - 3805
- No. of pages
- 9
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1093/mnras/stv253
- Publication date
- 04-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/can-there-be-additional-rocky-planets-in-the-habitable-zone-of-tight-binary-stars-with-a-known-gas-giant(e96e33b2-8c6c-47b4-8176-104bcde04bda).html