Location
Toomey Hall, Room 199
Presentation Date
April 22, 2023, 8:30am-10:00am
Session
Session 5s
Description
Massive planets may preferentially form just outside the water ice snowline in protoplanetary disks. How these massive planets which form at this location would influence the orbits of Earth mass planets located in the habitable zone of Solar type (G) stars and M dwarfs is investigated. Dynamical simulations that tracked the orbit evolution of an Earth mass planet in the habitable zone and an outer massive planet placed at the system’s primordial water ice snowline were performed. Cases with the Earth mass planet placed at different locations in the habitable zone and a Jupiter mass planet at the snowline around G star host stars and with a Neptune mass planet at the snowline around M star host stars were all considered. The magnitude and timescales of variation in the orbit of the habitable zone planet in each scenario from these simulations were then analyzed. The snowline is not as separated from the habitable zone around M dwarfs as for Solar type stars, so planets in the habitable zone of M dwarf stars are generally more strongly perturbed than planets in the habitable zone of G stars from massive planets located at the snowline. The average eccentricity of the Earth mass planets is greater the lower the host star mass. The average change in the planet's semimajor axis also increased with lower host star mass. Orbit perturbations in context with the change in solar flux received by the habitable zone planet and implications for its climate will be discussed.
Meeting Name
32nd Annual Spring Meeting of the NASA-Mo Space Grant Consortium
Document Type
Presentation
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2023 The Authors, all rights reserved.
Orbit Perturbations to Habitable Zone Planets from Massive Planets at the Snowline Around M Stars and G Stars
Toomey Hall, Room 199
Massive planets may preferentially form just outside the water ice snowline in protoplanetary disks. How these massive planets which form at this location would influence the orbits of Earth mass planets located in the habitable zone of Solar type (G) stars and M dwarfs is investigated. Dynamical simulations that tracked the orbit evolution of an Earth mass planet in the habitable zone and an outer massive planet placed at the system’s primordial water ice snowline were performed. Cases with the Earth mass planet placed at different locations in the habitable zone and a Jupiter mass planet at the snowline around G star host stars and with a Neptune mass planet at the snowline around M star host stars were all considered. The magnitude and timescales of variation in the orbit of the habitable zone planet in each scenario from these simulations were then analyzed. The snowline is not as separated from the habitable zone around M dwarfs as for Solar type stars, so planets in the habitable zone of M dwarf stars are generally more strongly perturbed than planets in the habitable zone of G stars from massive planets located at the snowline. The average eccentricity of the Earth mass planets is greater the lower the host star mass. The average change in the planet's semimajor axis also increased with lower host star mass. Orbit perturbations in context with the change in solar flux received by the habitable zone planet and implications for its climate will be discussed.
