The mutual orbit, mass, and density of transneptunian binary Gǃkúnǁ'hòmdímà (229762 2007 UK126)

Grundy, W. M.; Noll, K. S.; Benecchi, Susan; Ragozzine, Darin; Roe, H. G.

doi:10.1016/j.icarus.2018.12.037

Cited by 42 publications

(36 citation statements)

References 67 publications

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“…However, for (at least) dynamically cold, 100-km-class Kuiper belt binaries, the capture mechanisms of Goldreich et al (2002) -dynamical friction from a sea of small planetesimals ("L 2 s") and three-body encounters ("L 3 ") -appear to be ruled out by the observed distribution of the binaries' mutual orbit inclinations (Grundy et al, 2019a;. A likelier alternative origin is co-accretion (Nesvorný et al, 2010Grundy et al, 2019a), e.g., for Gǃkúnǁʼhòmdímà-Gǃò'éǃhú (Grundy et al, 2019b). Possible origins may also depend on formation location (dynamical class).…”

Section: Implications For Satellite Origin At Other Dwarf Planets In the Kuiper Beltmentioning

confidence: 99%

On the Origin of the Pluto System

Canup

Kratter

Neveu

2020

The Pluto System After New Horizons

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The goal of this chapter is to review hypotheses for the origin of the Pluto system in light of observational constraints that have been considerably refined over the 85-year interval between the discovery of Pluto and its exploration by spacecraft. We focus on the giant impact hypothesis currently understood as the likeliest origin for the Pluto-Charon binary, and devote particular attention to new models of planet formation and migration in the outer solar system. We discuss the origins conundrum posed by the system's four small moons. We also elaborate on implications of these scenarios for the dynamical environment of the early transneptunian disk, the likelihood of finding a Pluto collisional family, and the origin of other binary systems in the Kuiper belt. Finally, we highlight outstanding open issues regarding the origin of the Pluto system and suggest areas of future progress.

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Section: Implications For Satellite Origin At Other Dwarf Planets In the Kuiper Beltmentioning

confidence: 99%

On the Origin of the Pluto System

Canup

Kratter

Neveu

2020

The Pluto System After New Horizons

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“…The binary separation, a bin is obtained from Kepler's third law, assuming a density of 0.7 g cm −3 to obtain the mass, characteristic for 10-100 km-sized Kuiper belt bodies and Centaurs (see e.g. Grundy et al, 2019;Kiss et al, 2019, for a latest compilation of Kuiper belt densities). The densities estimated for Ceto-Phorcys (ρ = 1.37 +0.66 −0.32 g cm −3 and Typhon-Echinda (ρ = 0.44 +0.44 −0.17 g cm −3 Grundy et al, 2008) are at the lower/upper extremes of the densities of ∼100 km-sized objects, and therefore may not be representative for the whole population.…”

Section: Characterisation Of Potential Binaritymentioning

confidence: 99%

Light curves of ten Centaurs from K2 measurements

Márton

Kiss

Molnár

et al. 2020

Icarus

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Here we present the results of visible range light curve observations of ten Centaurs using the Kepler Space Telescope in the framework of the K2 mission. Well defined periodic light curves are obtained in six cases allowing us to derive rotational periods, a notable increase in the number of Centaurs with known rotational properties.The low amplitude light curves of (471931) 2013 PH 44 and (250112) 2002 KY 14 can be explained either by albedo variegations, binarity or elongated shape. (353222) 2009 YD 7 and (514312) 2016 AE 193 could be rotating elongated objects, while 2017 CX 33 and 2012 VU 85 are the most promising binary candidates due to their slow rotations and higher light curve amplitudes. (463368) 2012 VU 85 has the longest rotation period, P = 56.2 h observed among Centaurs. The P > 20 h rotation periods obtained for the two potential binaries underlines the importance of long, uninterrupted time series photometry of solar system targets that can suitably be performed only from spacecraft, like the Kepler in the K2 mission, and the currently running TESS mission.

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“…The known meteorite samples originated mainly from the main asteroid belt, where the average densities of objects are much higher than in the outer solar system (ρ 2 g cm −3 , in contrast with the trans-Neptunian region, where even densities of ρ 1 g cm −3 are common). In large Kuiper Belt objects current estimates point to a common primordial (bulk) density of ∼1.8 g cm −3 (Barr & Schwamb 2016;Grundy et al 2019), indicating a rock-to-ice ratio of ∼42:58 in volume and ∼70:30 in mass. This is notably higher ice content than in the main belt, where, e.g., the ρ = 2.16 g cm −3 density of (1) Ceres (Park et al 2016) indicates a rock-to-ice mass ratio of ∼80:20 and the high ρ = 3.5 g cm −3 density of (4) Vesta (Russell et al 2012) suggests a very low water ice content.…”

Section: Introductionmentioning

confidence: 83%

Serpentinization in the Thermal Evolution of Icy Kuiper Belt Objects in the Early Solar System

et al. 2022

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Here we present an improved algorithm to model the serpentinization process in planetesimals in the early solar system. Although it is hypothesized that serpentinization-like reactions played an important role in the thermal evolution of planetesimals, few and restricted models are available in this topic. These processes may be important, as the materials involved were abundant in these objects. Our model is based on the model by Góbi & Kereszturi and contains improvements in the consideration of heat capacities and lithospheric pressure and in the calculation of the amount of interfacial water. Comparison of our results with previous calculations shows that there are significant differences in, e.g., the serpentinization time—the time necessary to consume most of the reactants at specific initial conditions—or the amount of heat produced by this process. In a simple application we show that in icy bodies, under some realistic conditions, below the melting point of water ice, serpentinization reaction using interfacial water may be able to proceed and eventually push the local temperature above the melting point to start a “runaway” serpentinization. According to our calculations in objects with radii R ≳ 200 km, serpentinization might have quickly reformed nearly the whole interior of these bodies in the early solar system.

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The mutual orbit, mass, and density of transneptunian binary Gǃkúnǁ'hòmdímà (229762 2007 UK126)

Cited by 42 publications

References 67 publications

On the Origin of the Pluto System

On the Origin of the Pluto System

Light curves of ten Centaurs from K2 measurements

Serpentinization in the Thermal Evolution of Icy Kuiper Belt Objects in the Early Solar System

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