Polarimetric survey of main-belt asteroids

Gil-Hutton, R.; Cellino, A.; Bendjoya, P.

doi:10.1051/0004-6361/201424238

Cited by 24 publications

(23 citation statements)

References 24 publications

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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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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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“…Because (234) Barbara had been classified as Ld in the SMASS taxonomy, other asteroids of this or similar taxonomic classes were subsequently observed and 18 objects sharing the same polarimetric behaviour of Barbara were found by Gil-Hutton et al (2008), Masiero and Cellino (2009), Gil-Hutton and Cañada-Assandri (2011), Gil-Hutton et al (2014), Cellino et al (2014a), Bagnulo et al (2015), and Devogèle et al (2017a). They were collectively named Barbarians after the asteroid (234) Barbara.…”

Section: Introductionmentioning

confidence: 99%

New polarimetric and spectroscopic evidence of anomalous enrichment in spinel-bearing calcium-aluminium-rich inclusions among L-type asteroids

Devogèle

Tanga

Cellino

et al. 2018

Icarus

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Asteroids can be classified into several groups based on their spectral reflectance. Among these groups, the one belonging to the L-class in the taxonomic classification based on visible and near-infrared spectra exhibit several peculiar properties. First, their near-infrared spectrum is characterized by a strong absorption band interpreted as the diagnostic of a high content of the FeO bearing spinel mineral. This mineral is one of the main constituents of Calcium-Aluminum-rich Inclusions (CAI) the oldest mineral compounds found in the solar system. In polarimetry, they possess an uncommonly large value of the inversion angle incompatible with all known asteroid belonging to other taxonomical classes. Asteroids found to possess such a high inversion angle are commonly called Barbarians based on the first asteroid on which this property was first identified, (234) Barbara. In this paper we present the results of an extensive campaign of polarimetric and spectroscopic observations of L-class objects. We have derived phase-polarization curves for a sample of 7 Barbarians, finding a variety of inversion angles ranging between 25 and 30 • . Spectral reflectance data exhibit variations in terms of spectral slope and absorption features in the near-infrared. We analyzed these data using a Hapke model to obtain some inferences about the relative abundance of CAI and other mineral compounds. By combining spectroscopic and polarimetric results, we find evidence that the polarimetric inversion angle is directly correlated with the presence of CAI, and the peculiar polarimetric properties of Barbarians are primarily a consequence of their anomalous composition.

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“…Moreover, it was noted that P max and α max have a moderate correlation with grain size (Bowell et al 1972;Dollfus 1998;Shkuratov & Opanasenko 1992). While intensive polarimetric research on asteroids has been conducted at small phase angles (α 40 • , Belskaya et al 2009;Gil-Hutton & Cañada-Assandri 2011Gil-Hutton et al 2014;Cellino et al 2016;Belskaya et al 2017), polarimetric studies of asteroids at large α values remain less common, most likely because of fewer opportunities (limited to near-Earth asteroids, NEAs) and observational difficulty (small solar elongation).…”

Section: Introductionmentioning

confidence: 99%

Polarimetric Study of Near-Earth Asteroid (1566) Icarus

Ishiguro

Kuroda

Watanabe

et al. 2017

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We conducted a polarimetric observation of the fast-rotating near-Earth asteroid (1566) Icarus at large phase (Sun-asteroid-observer's) angles α= 57 • -141 • around the 2015 summer solstice. We found that the maximum values of the linear polarization degree are P max =7.32±0.25 % at phase angles of α max =124 • ±8 • in the V -band and P max =7.04±0.21 % at α max =124 • ±6 • in the R C -band. Applying the polarimetric slope-albedo empirical law, we derived a geometric albedo of p V =0.25±0.02, which is in agreement with that of Q-type taxonomic asteroids. α max is unambiguously larger than that of Mercury, the Moon, and another near-Earth S-type asteroid (4179) Toutatis but consistent with laboratory samples with hundreds of microns in size. The combination of the maximum polarization degree and the geometric albedo is in accordance with terrestrial rocks with a diameter of several hundreds of micrometers. The photometric function indicates a large macroscopic roughness. We hypothesize that the unique environment (i.e., the small perihelion distance q=0.187 au and a short rotational period of T rot =2.27 hours) may be attributed to the paucity of small grains on the surface, as indicated on (3200) Phaethon.

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Polarimetric survey of main-belt asteroids

Cited by 24 publications

References 24 publications

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

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

New polarimetric and spectroscopic evidence of anomalous enrichment in spinel-bearing calcium-aluminium-rich inclusions among L-type asteroids

Polarimetric Study of Near-Earth Asteroid (1566) Icarus

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