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