Origin of the wide-orbit circumbinary giant planet HD 106906
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | RODET, Laetitia | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | BEUST, H. | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | BONNEFOY, M. | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| dc.contributor.author | LAGRANGE, A.-M. | |
| hal.structure.identifier | Institut de Planétologie et d'Astrophysique de Grenoble [IPAG] | |
| hal.structure.identifier | Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] [IAG] | |
| dc.contributor.author | GALLI, P. A. B. | |
| hal.structure.identifier | M2A 2017 | |
| dc.contributor.author | DUCOURANT, C. | |
| hal.structure.identifier | Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] [IAG] | |
| dc.contributor.author | TEIXEIRA, R. | |
| dc.date.issued | 2017 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Context. A giant planet has been recently resolved at a projected distance of 730 au from the tight pair of young (~13 Myr) intermediate-mass stars HD 106906AB in the Lower Centaurus Crux (LCC) group. The stars are surrounded by a debris disk which displays a ring-like morphology and strong asymmetries at multiple scales.Aims. We aim to study the likelihood of a scenario where the planet formed closer to the stars in the disk, underwent inward disk-induced migration, and got scattered away by the binary star before being stabilized by a close encounter (fly-by).Methods. We performed semi-analytical calculations and numerical simulations (Swift_HJS package) to model the interactions between the planet and the two stars. We accounted for the migration as a simple force. We studied the LCC kinematics to set constraints on the local density of stars, and therefore on the fly-by likelihood. We performed N-body simulations to determine the effects of the planet trajectories (ejection and secular effects) onto the disk morphology.Results. The combination of the migration and mean-motion resonances with the binary star (often 1:6) can eject the planet. Nonetheless, we estimate that the fly-by hypothesis decreases the scenario probability to less than 10-7 for a derived local density of stars of 0.11 stars/pc3. We show that the concomitant effect of the planet and stars trajectories induce spiral-features in the disk which may correspond to the observed asymmetries. Moreover, the present disk shape suggests that the planet is on an eccentric orbit.Conclusions. The scenario we explored is a natural hypothesis if the planet formed within a disk. Conversely, its low probability of occurrence and the fact that HD 106906 b shares some characteristics with other systems in Sco-Cen (e.g., HIP 78530, in terms of mass ratio and separation) may indicate an alternative formation pathway for those objects. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics - Earth and Planetary Astrophysics | |
| dc.subject.en | methods: numerical | |
| dc.subject.en | celestial mechanics | |
| dc.subject.en | planetary systems | |
| dc.subject.en | planets and satellites: dynamical evolution and stability | |
| dc.subject.en | planet-disk interactions | |
| dc.title.en | Origin of the wide-orbit circumbinary giant planet HD 106906 | |
| dc.title.en | A dynamical scenario and its impact on the disk | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201630269 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1703.01857 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A12 | |
| bordeaux.volume | 602 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01484948 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01484948v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2017&rft.volume=602&rft.spage=A12&rft.epage=A12&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=RODET,%20Laetitia&BEUST,%20H.&BONNEFOY,%20M.&LAGRANGE,%20A.-M.&GALLI,%20P.%20A.%20B.&rft.genre=article |
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