The dynamical evolution of transiting planetary systems including a realistic collision prescription
Mustill, Alexander J LU
; Davies, Melvyn B
LU
and Johansen, Anders
LU
(2018)
In Monthly Notices of the Royal Astronomical Society
478(3).
p.2896-2908
- Abstract
- Planet–planet collisions are a common outcome of instability in systems of transiting planets close to the star, as well as occurring during in-situ formation of such planets from embryos. Previous N-body studies of instability amongst transiting planets have assumed that collisions result in perfect merging. Here, we explore the effects of implementing a more realistic collision prescription on the outcomes of instability and in-situ formation at orbital radii of a few tenths of an au. There is a strong effect on the outcome of the growth of planetary embryos, so long as the debris thrown off in collisions is rapidly removed from the system (which happens by collisional processing to dust, and then removal by radiation forces) and embryos... (More)
- Planet–planet collisions are a common outcome of instability in systems of transiting planets close to the star, as well as occurring during in-situ formation of such planets from embryos. Previous N-body studies of instability amongst transiting planets have assumed that collisions result in perfect merging. Here, we explore the effects of implementing a more realistic collision prescription on the outcomes of instability and in-situ formation at orbital radii of a few tenths of an au. There is a strong effect on the outcome of the growth of planetary embryos, so long as the debris thrown off in collisions is rapidly removed from the system (which happens by collisional processing to dust, and then removal by radiation forces) and embryos are small (<0.1 M⊕). If this is the case, then systems form fewer detectable (≥1 M⊕) planets than systems evolved under the assumption of perfect merging in collisions. This provides some contribution to the ‘Kepler dichotomy’: the observed overabundance of single-planet systems. The effects of changing the collision prescription on unstable mature systems of super-Earths are less pronounced. Perfect mergers only account for a minority of collision outcomes in such systems, but most collisions resulting in mass loss are grazing impacts in which only a few per cent of mass is lost. As a result, there is little impact on the final masses and multiplicities of the systems after instability when compared to systems evolved under the assumption that collisions always result in perfect merging. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/79a8d02e-3fe1-41aa-b5c8-ddae16b76fe1
- author
- Mustill, Alexander J
LU
; Davies, Melvyn B
LU
and Johansen, Anders
LU
- organization
- publishing date
- 2018-08-11
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Planets and satellites: Dynamical evolution and stability, planets and satellites: formation, Circumstellar matter
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 478
- issue
- 3
- pages
- 13 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85060843636
- ISSN
- 1365-2966
- DOI
- 10.1093/mnras/sty1273
- project
- IMPACT: Comets, asteroids and the habitability of planets
- VR Project Grant for Young Researchers
- Wallenberg Academy Fellow Project
- PLANETESYS: The next-generation planet formation model
- language
- English
- LU publication?
- yes
- id
- 79a8d02e-3fe1-41aa-b5c8-ddae16b76fe1
- alternative location
- https://arxiv.org/abs/1708.08939
- date added to LUP
- 2018-06-19 12:08:10
- date last changed
- 2024-04-01 07:20:54
@article{79a8d02e-3fe1-41aa-b5c8-ddae16b76fe1,
abstract = {{Planet–planet collisions are a common outcome of instability in systems of transiting planets close to the star, as well as occurring during in-situ formation of such planets from embryos. Previous N-body studies of instability amongst transiting planets have assumed that collisions result in perfect merging. Here, we explore the effects of implementing a more realistic collision prescription on the outcomes of instability and in-situ formation at orbital radii of a few tenths of an au. There is a strong effect on the outcome of the growth of planetary embryos, so long as the debris thrown off in collisions is rapidly removed from the system (which happens by collisional processing to dust, and then removal by radiation forces) and embryos are small (<0.1 M⊕). If this is the case, then systems form fewer detectable (≥1 M⊕) planets than systems evolved under the assumption of perfect merging in collisions. This provides some contribution to the ‘Kepler dichotomy’: the observed overabundance of single-planet systems. The effects of changing the collision prescription on unstable mature systems of super-Earths are less pronounced. Perfect mergers only account for a minority of collision outcomes in such systems, but most collisions resulting in mass loss are grazing impacts in which only a few per cent of mass is lost. As a result, there is little impact on the final masses and multiplicities of the systems after instability when compared to systems evolved under the assumption that collisions always result in perfect merging.}},
author = {{Mustill, Alexander J and Davies, Melvyn B and Johansen, Anders}},
issn = {{1365-2966}},
keywords = {{Planets and satellites: Dynamical evolution and stability; planets and satellites: formation; Circumstellar matter}},
language = {{eng}},
month = {{08}},
number = {{3}},
pages = {{2896--2908}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{The dynamical evolution of transiting planetary systems including a realistic collision prescription}},
url = {{http://dx.doi.org/10.1093/mnras/sty1273}},
doi = {{10.1093/mnras/sty1273}},
volume = {{478}},
year = {{2018}},
}