Mariana Sanchez
Leiden University, The Netherlands
Abstract
Due to the improvements in radial velocity and transit techniques, we know that rocky planets in compact configurations are the most common ones around M dwarfs. On the other hand, thanks to the high angular resolution of ALMA we know that most disks around very low mass stars are rather compact and small, which favors the idea of an efficient radial drift that could enhance planet formation close to the star. To test this hypothesis, rocky planet formation around M dwarfs in compact dust disks has been studied through N-body simulations. In the simulations, there are external effects incorporated such as planet-disk interactions, star-planet tidal interactions and relativistic corrections, that include the evolution of the luminosity, radius and rotational period of the star. Different gas-disk viscosities, initial embryo distributions, stellar masses and core accretion mechanisms (pebble and planetesimal accretion) were proposed. The main result is that the sample of simulated planets that grow by pebble accretion in a gas-disk with low viscosity can reproduce the low-mass exoplanet population around M dwarfs in terms of multiplicity, masses and semi-major axis (see https://arxiv.org/pdf/2406.07760).
On the other hand, in order to estimate the probability of detection of rocky planetary systems around M dwarfs, a numerical tool in python has been developed. This new tool calculates the changes in stellar flux, radial velocity and proper motion of a sample of stars due to the interaction with their planetary systems, and estimates the probability of detection of planetary systems regarding different samplings and errors associated with a given instrument or survey. A significant result is that the radial velocity method allows a high probability of planetary detection around very low mass stars, with the current and future technology (Sanchez et al, in prep).
2024 July 18, 11:00
IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto
