Dynamics and Origins of Extrasolar Multi-planet Systems

Professor Lee, Man Hoi   (Principal Investigator (PI))

Dr Reffert Sabine   (Co-Investigator)

Dr Trifonov Trifon   (Co-Investigator)

Professor Quirrenbach Andreas   (Co-Investigator)

42

2018-11-01

2022-04-30

505298

Dynamics and Origins of Extrasolar Multi-planet Systems

Extrasolar Planets, Planetary System Dynamics, Planetary System Origins

Planetary SciencesPhysics

Physical Sciences (P)

17305618

General Research Fund (GRF)

2018

Completed

1 We will investigate the radial velocity data collected by the CARMENES survey of low-mass stars to discover and characterize new multiple planet systems. 2 We will combine new CARMENES data with existing data to improve our understanding of the 4-planet system around GJ~876. We will examine whether the 1:2:4 Laplace resonance of the outer three planets is chaotic, which places constraints on planetary migration during formation, and whether the orbit of the innermost planet is eccentric, which places constraints on the efficiency of planetary tides. 3 We will use new radial velocity data to determine whether some systems previously identified as having a single planet on eccentric orbit in fact harbor two planets in 2:1 mean-motion resonance. 4 We propose to investigate three aspects of the extraordinary TRAPPIST-1 system, which has 7 Earth-mass planets in a chain of resonances. We will examine the stability of the best fits, constraints on the orbital eccentricities if the system has 2-body resonances, and constraints on disk-induced migration leading to the resonant chain.