Seminarium odbywa się w środy o 11:15 w warszawskim oddziale Centrum Astronomicznego lub w wersji online na platformie Zoom. Językiem wykładowym jest angielski; seminarium prowadzi dr Stanisław Bajtlik (bajtlik@camk.edu.pl). Zapraszamy również osoby spoza Centrum Astronomicznego. W sprawie szczegółów technicznych prosimy kontaktować się e-mailowo z dr. Stanisławem Bajtlikiem.
Zijia Cui (University of Szczecin)
In recent decades, more than 800 multi-planetary systems with a great variety of the architectures have been discovered. The fundamental role in shaping the planetary systems during the early stages of their evolution, plays planetary migration. The newly born or still forming planets embedded in a gaseous protoplanetary disk move around their host stars in orbits modified continuously by their gravitational interactions with the material in the disk. It is expected that, when the relative migration of two planets is convergent, then the capture into a mean-motion resonance can occur. Is this expectation always met? In my presentation I will answer this question, on the basis of a full two-dimensional hydrodynamic treatment of the disk-planet interactions, accompanied, where relevant, with the analytic estimates of the effects of the density waves excited by the planets in the disk. I will focus on the systems containing the most numerous planets known till now, called super-Earths or mini-Neptunes. I will demonstrate that a system of two super-Earths can be repelled from the first-order resonance configurations due to the wave-planet interactions and I will give the conditions, which must be satisfied for that. My results provide one of the possible reasons why there are not so many planet pairs observed to be locked in the mean-motion resonances.
Journal Club odbywa się w poniedziałki o 11:10 w Barku warszawskiego Centrum Astronomicznego. Językiem wykładowym jest angielski; spotkania prowadzi Jonas Pereira.