Refining the asteroid taxonomy by polarimetric observations

Belskaya, I. N.; Fornasier, S.; Tozzi, G. P.; Gil-Hutton, R.; Cellino, A.; Antonyuk, K. A.; Krugly, Yu. N.; Dovgopol, A. N.; Faggi, Sara

doi:10.1016/j.icarus.2016.11.003

Cited by 59 publications

(76 citation statements)

References 54 publications

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“…We found for Bennu Ψ = 6.083 ± 0.266 and a corresponding formal solution for the albedo of 0.059 ± 0.003. This value, to be confirmed when a better sampling of the phase-polarisation curve is available, fits nicely the value found for the F-class by Belskaya et al (2017), namely 0.058 ± 0.011. The same authors found for the B-class an average albedo of 0.083 ± 0.034.…”

Section: Datesupporting

confidence: 87%

“…For the vast majority of asteroids the polarisation changes its sign (i.e., becomes perpendicular to the scattering plane) at phase-angles 20 • (the "inversion angle" αinv). However, in the case of the F-class asteroids, the inversion angle occurs at the distinctly lower phase-angle of ∼ 16 • (Belskaya et al 2017). Furthermore, the slope of the polarimetric curve around the inversion angle tends to be substantially steeper for F-class asteroids with respect to other taxonomic classes.…”

Section: Introductionmentioning

confidence: 91%

“…This is a three-parameter relation issued from a semiempirical modeling that Kaasalainen et al (2003) found to be suited to fit both phase-magnitude relations in asteroid photometry, and phase-polarization curves in asteroid polarimetry (see also Belskaya et al 2017;Cellino et al 2015b, and references therein). In Eq.…”

Section: Datementioning

confidence: 99%

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Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies

Cellino

Bagnulo

Belskaya

et al. 2018

Monthly Notices of the Royal Astronomical Society: Letters

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We have obtained polarimetric measurements of asteroid (101955) Bennu, a presumably primitive near-Earth object (NEO) that is the target of NASA's sample return mission OSIRIS-REx. During our observing campaign, Bennu was visible from Earth under a wide range of illumination conditions, with phase-angle in the range 16 • to 57 • . Together with (3200) Phaethon and (152679) 1998 KU2, observed very recently, Bennu is the only existing example of a primitive NEO observed in polarimetric mode over a wide interval of phase angles. Based on our polarimetric data, we propose that Bennu belongs to the unusual F taxonomic class defined in the 80s. According to previous works, the F-class includes objects with cometary features. This fact can be of great importance for the interpretation of the results of the exploration of this object by OSIRIS-REx. From polarimetry we also derive an estimate of the geometric albedo of Bennu: p R = 0.059 ± 0.003.

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Section: Datesupporting

confidence: 87%

Section: Introductionmentioning

confidence: 91%

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Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies

Cellino

Bagnulo

Belskaya

et al. 2018

Monthly Notices of the Royal Astronomical Society: Letters

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“…The polarimetric observation results of 86 asteroids using the Bus-DeMeo taxonomy were referred from (Belskaya et al 2017;Cellino et al 2015;Cellino et al 2016;Gil-Hutton, Cellino, & Bendjoya 2014); the radar values for 74 classified asteroids were obtained from Neese, Benner, & Ostro (2012). The polarimetric and radar values of the classified asteroids are shown in figures 7 and 8, respectively.…”

Section: Number Numbermentioning

confidence: 99%

Follow-up observations for the Asteroid Catalog using AKARI Spectroscopic Observations

Hasegawa

Kuroda

Yanagisawa

et al. 2017

Publications of the Astronomical Society of Japan

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In the 1-2.5 µm range, spectroscopic observations are made on the AcuA-spec asteroids, whose spectra were obtained in a continuous covered mode between 2.5-5.0 µm by AKARI.Based on the Bus-DeMeo taxonomy (DeMeo et al. 2009, Icarus, 202, 160), all the AcuA-spec asteroids are classified, using the published and our observational data. Additionally, taking advantage of the Bus-DeMeo taxonomy characteristics, we constrain the characteristic each spectral type by combining the taxonomy results with the other physical observational data from colorimetry, polarimetry, radar, and radiometry. As a result, it is suggested that certain C-, Cb-, B-type, dark X-, and D-complex asteroids have spectral properties compatible with those of anhydrous interplanetary dust particles with tiny bright material, such as water ice.This supports the proposal regarding the C-complex asteroids (Vernazza et al. 2015, ApJ, 806, 204; 2017, AJ, 153, 72). A combination of the Bus-DeMeo taxonomy for AcuA-spec asteroids and the presumptions with other physical clues such as the polarimetric inversion angle, radar albedo, and mid-infrared spectroscopic spectra will be beneficial for surface material constraints, from the AcuA-spec asteroid observations. 2

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“…The primary constituents of cometary dust are silicates (mainly in the form of olivine and pyroxene), carbonaceous materials (amorphous carbon and organics), Fe-bearing sulfides, and ice (Levasseur-Regourd et al 2018). Unlike asteroids, the optical properties of which are largely differentiated with respect to heliocentric distance (DeMeo & Carry 2014;Belskaya et al 2017), comets seem to possess fairly homogeneous bulk optical properties with a low geometric albedo of ∼0.04 (Lamy et al 2004), showing a nearly uniform distribution on the polarimetric phase curves, regardless of dynamical classes (Kwon et al 2017). However, any difference in a comet might be expected if we consider the grain properties with depth in the nucleus, perhaps as a result of mainly solar irradiation on the outer layers.…”

Section: Change In Composition Of Dust Particlesmentioning

confidence: 99%

Near-infrared polarimetric study of near-Earth object 252P/LINEAR: an implication of scattered light from the evolved dust particles

Kwon¹,

Ishiguro²,

Kwon

et al. 2019

A&A

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Context. Comets have been resurfacing under solar radiation while preserving their primordial interiors. Multi-epoch observations of comets enable us to characterize a change in sublimation pattern as a function of heliocentric distance, which in turn provides information on the dust environment of comets. Aims. We aim to constrain the size and porosity of ejected dust particles from comet 252P/LINEAR and their evolution near the perihelion via near-infrared (NIR) multiband polarimetry. A close approach of the comet to the Earth in March 2016 (∼0.036 au) provided a rare opportunity for the sampling of the comet with a high spatial resolution. Methods. We made NIR JHK S bands (1.25-2.25 µm) polarimetric observations of the comet for 12 days near perihelion, interspersed between broadband optical (0.48-0.80 µm) imaging observations over four months. In addition, dynamical simulation of the comet was performed 1000 yr backward in time.Results. We detected two discontinuous brightness enhancements of 252P/LINEAR. Before the first enhancement, the NIR polarization degrees of the comet were far lower than those of ordinary comets at a given phase angle. Soon after the activation, however, they increased by ∼13 % at most, showing unusual blue polarimetric color over the J and H bands (−2.55 % µm −1 on average) and bluing of both J − H and H − K S dust color. Throughout the event, the polarization vector was marginally aligned perpendicular to the scattering plane (i.e., θ r = 4.6 • -10.9 • ). The subsequent postperihelion reactivation of the comet lasted for approximately 1.5 months, with a factor of ∼30 times pre-activation dust mass-loss rates in the R C band. Conclusions. The marked increase in the polarization degree with blue NIR polarimetric color is reminiscent of the behaviors of a fragmenting comet D/1999 S4 (LINEAR). The most plausible scenario for the observed polarimetric properties of 252P/LINEAR would be an ejection of predominantly large (well in geometrical optics regime), compact dust particles from the desiccated surface layer. We conjecture that the more intense solar heating that the comet has received in the near-Earth orbit would cause the paucity of small, fluffy dust particles around the nucleus of the comet.

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Refining the asteroid taxonomy by polarimetric observations

Cited by 59 publications

References 54 publications

Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies

Unusual polarimetric properties of (101955) Bennu: similarities with F-class asteroids and cometary bodies

Follow-up observations for the Asteroid Catalog using AKARI Spectroscopic Observations

Near-infrared polarimetric study of near-Earth object 252P/LINEAR: an implication of scattered light from the evolved dust particles

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