ORCID Profile
0000-0001-5368-386X
Current Organisation
Campion College
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Publisher: American Astronomical Society
Date: 05-2022
DOI: 10.3847/PSJ/AC67E0
Abstract: There have been 77 TNOs discovered to be librating in the distant trans-Neptunian resonances (beyond the 2:1 resonance, at semimajor axes greater than 47.7 au) in four well-characterized surveys: the Outer Solar System Origins Survey (OSSOS) and three similar prior surveys. Here, we use the OSSOS Survey Simulator to measure their intrinsic orbital distributions using an empirical parameterized model. Because many of the resonances had only one or very few detections, j : k resonant objects were grouped by k in order to have a better basis for comparison between models and reality. We also use the Survey Simulator to constrain their absolute populations, finding that they are much larger than predicted by any published Neptune migration model to date we also find population ratios that are inconsistent with published models, presenting a challenge for future Kuiper Belt emplacement models. The estimated population ratios between these resonances are largely consistent with scattering–sticking predictions, though further discoveries of resonant TNOs with high-precision orbits will be needed to determine whether scattering–sticking can explain the entire distant resonant population or not.
Publisher: American Astronomical Society
Date: 29-12-2016
Publisher: American Astronomical Society
Date: 02-07-2019
Publisher: Oxford University Press (OUP)
Date: 06-06-2017
Publisher: American Astronomical Society
Date: 05-06-2019
Publisher: Frontiers Media SA
Date: 16-05-2018
Publisher: American Astronomical Society
Date: 03-05-2017
Publisher: American Astronomical Society
Date: 25-03-2021
Abstract: Here, we present results on the intrinsic collision probabilities, P I , and range of collision speeds, V I , as a function of the heliocentric distance, r , in the trans-Neptunian region. The collision speed is one of the parameters that serves as a proxy for a collisional outcome (e.g., disruption and scattering of fragments, or formation of a crater, as both processes are related to the impact energy). We utilize an improved and debiased model of the trans-Neptunian object (TNO) region from the “Outer Solar System Origins Survey” (OSSOS). It provides a well-defined model of TNO orbital distribution, based on multiple opposition observations of more than 1000 bodies. We compute collisional probabilities for the OSSOS models of the main classical, resonant, detached+outer, and scattering TNO populations. The intrinsic collision probabilities and collision speeds are computed using Öpik’s approach, as revised and modified by Wetherill for noncircular and inclined orbits. The calculations are carried out for each of the dynamical TNO groups, allowing for inter-population collisions as well as collisions within each TNO population, resulting in 28 combinations in total. Our results indicate that collisions in the trans-Neptunian region are possible over a wide range in ( r , V I ) phase space. Although collisions are calculated to happen within r ∼ 20–200 au and V I ∼ 0.1 km s −1 to as high as V I ∼ 9 km s −1 , most of the collisions are likely to happen at low relative velocities V I 1 km s −1 and are dominated by the main classical belt.
Publisher: American Astronomical Society
Date: 11-05-2018
Publisher: Elsevier BV
Date: 06-2021
Publisher: American Astronomical Society
Date: 13-07-2017
Publisher: American Astronomical Society
Date: 06-2018
Publisher: Oxford University Press (OUP)
Date: 19-06-2012
Publisher: American Astronomical Society
Date: 11-2019
Publisher: American Astronomical Society
Date: 18-04-2018
Publisher: American Astronomical Society
Date: 10-01-2017
Publisher: American Astronomical Society
Date: 31-08-2016
Publisher: American Astronomical Society
Date: 06-2023
DOI: 10.3847/PSJ/ACD771
Abstract: We calculate the upper bounds of the population of theoretically stable Centaur orbits between Uranus and Neptune. These small bodies are on low-eccentricity, low-inclination orbits in two specific bands of semimajor axis, centered at ∼24.6 and ∼25.6 au. They exhibit unusually long Gyr-stable lifetimes in previously published numerical integrations, orders of magnitude longer than that of a typical Centaur. Despite the increased breadth and depth of recent Solar System surveys, no such objects have been found. Using the Outer Solar System Origins Survey simulator to calculate the detection efficiency for these objects in an ensemble of fully characterized surveys, we determine that a population of 72 stable Centaurs with absolute magnitude H r ≤ 10 (95% confidence upper limit) could remain undetected. The upcoming Legacy Survey of Space and Time will be able to detect this entire intrinsic population, due to its complete coverage of the ecliptic plane. If detected, these objects will be interesting dynamically accessible mission targets—especially as comparison of the stable Centaur orbital phase space to the outcomes of several modern planetary migration simulations suggests that these objects could be close to primordial in nature.
Publisher: American Astronomical Society
Date: 05-12-2016
Location: United States of America
No related grants have been discovered for Samantha Lawler.