Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations

Farkas-Takács, Anikó; Kiss, Cs.; Pál, András; Molnár, L.; Szabó, Gy. M.; Hanyecz, O.; Sárneczky, K.; Szabo, Robert M.; Márton, G.; Mommert, Michael; Szakáts, R.; Müller, Thomas; Kiss, L. L.

doi:10.3847/1538-3881/aa8365

Cited by 19 publications

(12 citation statements)

References 71 publications

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“…Despite their similar mass density, albedos of Phobos and Deimos, ≈ 0.07, are roughly an order of magnitude smaller than the albedos of Styx, Nix, Kerberos, and Hydra (Zellner & Capen 1974;Thomas et al 1996;Cantor et al 1999). Aside from Triton (0.72; Hicks & Buratti 2004), all of the satellites of Uranus and Neptune have albedos smaller than 0.4 (e.g., Karkoschka 2001Karkoschka , 2003Fry & Sromovsky 2007;Farkas-Takács et al 2017, and references therein). Among Jupiter's satellites, only Io, Europa, and Ganymede have albedos larger than 0.4 (Buratti & Veverka 1983;Simonelli & Veverka 1984).…”

Section: Comparison With Other Satellite Systemsmentioning

confidence: 99%

A Pluto–Charon Sonata: Dynamical Limits on the Masses of the Small Satellites

Kenyon

Bromley

2019

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During 2005-2012, images from Hubble Space Telescope (HST) revealed four moons orbiting Pluto-Charon (Weaver et al. 2006;Showalter et al. 2011Showalter et al. , 2012. Although their orbits and geometric shapes are well-known, the 2σ uncertainties in the masses of the two largest satellites -Nix and Hydra -are comparable to their HST masses (Brozović et al. 2015;Showalter & Hamilton 2015;Weaver et al. 2016). Remarkably, gravitational n-body computer calculations of the long-term system stability on 0.1-1 Gyr time scales place much tighter constraints on the masses of Nix and Hydra, with upper limits ∼ 10% larger than the HST mass. Constraints on the mass density using size measurements from New Horizons suggest Nix and Hydra formed in icier material than Pluto and Charon.Subject headings: planets and satellites: dynamical evolution and stabilityplanets and satellites: individual (Pluto)

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Section: Comparison With Other Satellite Systemsmentioning

confidence: 99%

A Pluto–Charon Sonata: Dynamical Limits on the Masses of the Small Satellites

Kenyon

Bromley

2019

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“…In the case of Jovian Trojans a binary fraction of 6-36% (Ryan et al, 2017) and ∼20% was estimated from the data. These studies were carried out in the course of systematic programs in the K2 mission, aimed at obtaining light curves of solar system targets, including main belt asteroids Berthier et al, 2016;Molnár et al, 2018), Jovian Trojans (Ryan et al, 2017;Szabó et al, 2017), transneptunian objects Benecchi et al, 2018) and irregular moons of giant planets Farkas-Takács et al, 2017). These observations provided continuous light curves which had significantly longer time-spans (up to 80 days) than ground-based measurements and therefore could break the ambiguity of rotational periods caused by daily aliases.…”

Section: Introductionmentioning

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 flux densities of Solar System targets are derived from the double-differential products (see Kiss et al, 2014, for details). These double-differential images, as well as co-added and simple differential images, are available in the Herschel Science Archive 1 as User Provided Data Products (UPDPs), along with a detailed description of the processing steps and the data products (UPDP Release Note Version 1.0, May 5, Kiss et al, 2017). The summary of the observations, as well as the derived in-band flux densities, are measured with the specific instrument-filter combinations) are presented in Table 1.…”

Section: Herschel-pacs Datamentioning

confidence: 99%

TNOs are Cool! A Survey of the transneptunian Region XV. Physical characteristics of 23 resonant transneptunian and scattered disk objects

Farkas-Takács,

Kiss,

Vilenius

et al. 2020

Preprint

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The goal of this work is to determine the physical characteristics of resonant, detached and scattered disk objects in the trans-Neptunian region, observed mainly in the framework of the "TNOs are Cool" Herschel Open Time Key Programme. Based on thermal emission measurements with the Herschel/PACS and Spitzer/MIPS instruments, we determine size, albedo, and surface thermal properties for 23 objects using radiometric modeling techniques. This is the first analysis in which the physical properties of objects in the outer resonances are determined for a notable sample. In addition to the results for individual objects, we compared these characteristics with the bulk properties of other populations of the trans-Neptunian region. The newly analyzed objects show a large variety of beaming factors, indicating a diversity of thermal properties, and in general they follow the albedo-color clustering identified earlier for Kuiper belt objects and Centaurs, further strengthening the evidence for a compositional discontinuity in the young Solar System.

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Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations

Cited by 19 publications

References 71 publications

A Pluto–Charon Sonata: Dynamical Limits on the Masses of the Small Satellites

A Pluto–Charon Sonata: Dynamical Limits on the Masses of the Small Satellites

Light curves of ten Centaurs from K2 measurements

TNOs are Cool! A Survey of the transneptunian Region XV. Physical characteristics of 23 resonant transneptunian and scattered disk objects

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