Understanding the origin of white dwarf atmospheric pollution by dynamical simulations based on detected three-planet systems

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Understanding the origin of white dwarf atmospheric pollution by dynamical simulations based on detected three-planet systems

Maldonado, R. F. (författare): National Institute Of Astrophysics, Optics And Electronics (INAOE)

Villaver, E. (författare): European Space Astronomy Centre,Autonomous University of Madrid

Mustill, A. J. (författare): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

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Chavez, M. (författare): National Institute Of Astrophysics, Optics And Electronics (INAOE)

Bertone, E. (författare): National Institute Of Astrophysics, Optics And Electronics (INAOE)

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2020-09-25
2020
Engelska 16 s.
Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 499:2, s. 1854-1869

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Abstract Ämnesord

Stäng

Between 25 and 50 per cent of white dwarfs (WD) present atmospheric pollution by metals, mainly by rocky material, which has been detected as gas/dust discs, or in the form of photometric transits in some WDs. Planets might be responsible for scattering minor bodies that can reach stargazing orbits, where the tidal forces of the WD can disrupt them and enhance the chances of debris to fall on to the WD surface. The planet-planet scattering process can be triggered by the stellar mass-loss during the post main-sequence (MS) evolution of planetary systems. In this work, we continue the exploration of the dynamical instabilities that can lead to WD pollution. In a previous work, we explored two-planet systems found around MS stars and here we extend the study to three-planet system architectures. We evolved 135 detected three-planet systems orbiting MS stars to the WD phase by scaling their orbital architectures in a way that their dynamical properties are preserved using the N-body integrator package mercury. We find that 100 simulations (8.6 per cent) are dynamically active (having planet losses, orbit crossing, and scattering) on the WD phase, where low-mass planets (1-100 M⊕) tend to have instabilities in Gyr time-scales, while high-mass planets (>100 M⊕) decrease the dynamical events more rapidly as the WD ages. Besides, 19 simulations (1.6 $ per cent) were found to have planets crossing the Roche radius of the WD, where 9 of them had planet-star collisions. Our three-planet simulations have a slight increase in percentage of simulations that may contribute to the WD pollution than the previous study involving two-planet systems and have shown that planet-planet scattering is responsible of sending planets close to the WD, where they may collide directly to the WD, become tidally disrupted or circularize their orbits, hence producing pollution on the WD atmosphere.

Ämnesord

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

circumstellar matter
Kuiper belt: general
planetary systems
planets and satellites: dynamical evolution and stability
stars: AGB and post-AGB
white dwarfs

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Av författaren/redakt...: Maldonado, R. F.; Villaver, E.; Mustill, A. J.; Chavez, M.; Bertone, E.

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NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Astronomi astrof ...

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Av lärosätet: Lunds universitet

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