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Astrophysics Seminar: "Hot Jupiters from alternative secular high-eccentricity migration scenarios" | The Racah Institute of Physics

Astrophysics Seminar: "Hot Jupiters from alternative secular high-eccentricity migration scenarios"

Date: 
Sun, 29/01/201712:30-13:30
Location: 
Kaplun building, Room No. 200
Lecturer: Dr. Adrian Hamers Affiliation: Princeton University Abstract: One of the proposed formation origins of hot Jupiters (HJs) is high-eccentricity (high-e) migration. In this case, the eccentricity of the orbit of a planet initially beyond the ice line is dynamically excited by a secular process, which leads to small periapse distances and strong tidal dissipation. An extensively-studied scenario of high-e migration involves an inclined and/or highly eccentric binary companion (star or massive planet). A major problem is that the predicted formation rates are too low compared to observations, by a factor of ~ 10. Therefore, alternative scenarios are needed. Recently, an alternative scenario was proposed involving three or more planets. This scenario of secular chaos can potentially produce many HJs because the initial conditions to achieve high eccentricities are less stringent compared to the case of a binary companion. Until recently, studies of this scenario were limited to small phase space due to the prohibitive nature of direct N-body integrations. Here, we use a new secular method to study the formation of HJs with secular chaos in multiplanet systems. Also, we consider scenarios in which HJs are formed in stellar triple systems, and discuss how secular evolution suggests the presence of unseen planetary companions to hot Jupiters in stellar binaries. Additional details of the upcoming Astrophysics' seminars can be found on the following link. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://plus.google.com/hangouts/_/mail.huji.ac.il/astrophysics?hceid=bWFpbC5odWppLmFjLmlsX2c0czhydDlpcmhwZzRvdGNybWIzZGFqcjdvQGdyb3VwLmNhbGVuZGFyLmdvb2dsZS5jb20.4ofhekcn5g8qal61orjrhkmnpo&hs=121