The phase-polarization curve of asteroid (3200) Phaethon†

Devogèle, Maxime; Cellino, A.; Borisov, G.; Bendjoya, P.; Rivet, Jean‐Pierre; Abe, Lyu; Bagnulo, S.; Christou, Apostolos; Vernet, David; Donchev, Z.; Belskaya, I. N.; Bonev, T.; Krugly, Yu. N.

doi:10.1093/mnras/sty1587

Cited by 32 publications

(44 citation statements)

References 37 publications

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“…The expected maximum linear polarization degree, P max , of Phaethon is >42.4% (3σ lower limit) and α max , α at P max , is located at >114 • . This value is consistent with other polarimetric observations of Phaethon (Ito et al 2018;Devogéle et al 2018). The derived P max at α max of Phaethon are more than four times larger than those values for the moderate albedo asteroids (e.g., P max <∼9%; Lupishko 2014; Ishiguro et al 2017, at α max ∼ 100 • ; Geake & Dollfus 1986;Lupishko 2014), implying peculiar surface properties of Phaethon.…”

Section: Observations and Data Reductionsupporting

confidence: 93%

Inversion Angle of Phase-polarization Curve of Near-Earth Asteroid (3200) Phaethon

Shinnaka

Kasuga

Furusho

et al. 2018

ApJL

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The linear polarization degree (referred to the scattering plane, P r ) as a function of the solar phase angle, α, of solar system objects is a good diagnostic to understand the scattering properties of their surface materials. We report P r of Phaethon over a wide range of α from 19 • .1 to 114 • .3 in order to better understanding properties of its surface materials. The derived phase-polarization curve shows that the maximum of P r , P max , is >42.4% at α >114 • .3, a value significantly larger than those of the moderate albedo asteroids (P max ∼9%). The phase-polarization curve classifies Phaethon as B-type in the polarimetric taxonomy, being compatible with the spectral property. We compute the geometric albedo, p v , of 0.14 ± 0.04 independently by using an empirical slope-albedo relation, and the derived p v is consistent with previous results determined from mid-infrared spectra and thermophysical modeling. We could not find a fit to the period in our polarimetric data in the range from 0 up to 7.208 hr (e.g., less than twice the rotational period) and found significant differences between our P r during the 2017 approach to the Earth and that of the 2016. These results imply that Phaethon has a region with different properties for light scattering near its orbital pole.Note-UT date is the mid-time of the start and final sequences. φ and α are the angle of the scattering plane and the solar phase angle of the observations, respectively. Texp is exposure time of each frame in seconds and number of sequences. UP, GT, and SP in the column of polarimetric standard stars indicate unpolarized standard stars, fully linear polarized light from the Glan-Taylor prism, and strong polarized standard stars, respectively; chosen from Serkowski (1974), Schmidt et al. (1992), andWolff et al. (1996) for calibrating the instrumental polarization. RESULTS AND DISCUSSION

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Section: Observations and Data Reductionsupporting

confidence: 93%

Inversion Angle of Phase-polarization Curve of Near-Earth Asteroid (3200) Phaethon

Shinnaka

Kasuga

Furusho

et al. 2018

ApJL

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“…Until recently, a meaningful comparison with data for other asteroids at large phase-angles would not have been possible, because only a few moderate-or high-albedo near-Earth asteroids, supposed to have a completely different thermal history and composition than Bennu, had been observed. However, very recently Ito et al (2018) and Devogèle et al (2018) carried out polarimetric observations of the NEO (3200) Phaethon at very large phase-angles. The analysis of their data led Devogèle et al (2018) to conclude that Phaethon is most likely a collisional fragment of the B-class asteroid (2) Pallas, in particular a fugitive from Pallas' family, confirming previous results based exclusively on spectral reflectance data by De León et al (2010).…”

Section: Discussionmentioning

confidence: 99%

“…However, very recently Ito et al (2018) and Devogèle et al (2018) carried out polarimetric observations of the NEO (3200) Phaethon at very large phase-angles. The analysis of their data led Devogèle et al (2018) to conclude that Phaethon is most likely a collisional fragment of the B-class asteroid (2) Pallas, in particular a fugitive from Pallas' family, confirming previous results based exclusively on spectral reflectance data by De León et al (2010). The observations by Devogèle et al (2018) and Ito et al (2018) are also shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

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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“…MacLennan & Emery 2018; Hanuš et al 2015) or polarimetric phase curves (e.g. Cellino et al 2018;Devogèle et al 2018). In order to analyze the role of planetary encounters in surface alteration, we consider the Q/S ratio.…”

Section: S and Q-complex Asteroidsmentioning

confidence: 99%

“…Ostro et al 2006), andpolarimetry (e.g. De Luise et al 2007;Devogèle et al 2018;Cellino et al 2018). However, an equivalent census for sub-km NEOs, which represent more than 95% of the currently known population, does not exist.…”

Section: Introductionmentioning

confidence: 99%

Visible Spectroscopy from the Mission Accessible Near-Earth Object Survey (MANOS): Taxonomic Dependence on Asteroid Size

Devogèle

Moskovitz

Thirouin

et al. 2019

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The Mission Accessible Near-Earth Object Survey (MANOS) aims to observe and characterize small (mean absolute magnitude H ∼ 25 mag) Near-Earth Objects (NEOs) that are accessible by spacecraft (mean ∆v ∼ 5.7 km/s) and that make close approaches with the Earth (mean Minimum Orbital Intersection Distance MOID ∼ 0.03 AU). We present here the first results of the MANOS visible spectroscopic survey. The spectra were obtained from August 2013 to March 2018 at Lowell Observatory's Discovery Channel 4.3 meter telescope, and both Gemini North and South facilities. In total, 210 NEOs have been observed and taxonomically classified. Our taxonomic distribution shows significant variations with respect to surveys of larger objects. We suspect these to be due to a dependence of Main Belt source regions on object size. Compared to previous surveys of larger objects (Binzel et al. 2019Perna et al. 2018), we report a lower fraction of S+Q-complex asteroids of 43.8 ± 4.6%. We associate this decrease with a lack of Phocaea family members at very small size. We also report higher fractions of X-complex and A-type asteroids of 23.8 ± 3.3% and 3.8 ± 1.3% respectively due to an increase of Hungaria family objects at small size. We find a strong correlation between the Q/S ratio and perihelion distance. We suggest this correlation is due to planetary close encounters with Venus playing a major role in turning asteroids from S to Q-type. This hypothesis is supported by a similar correlation between the Q/S ratio and Venus MOID.

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The phase-polarization curve of asteroid (3200) Phaethon†

Cited by 32 publications

References 37 publications

Inversion Angle of Phase-polarization Curve of Near-Earth Asteroid (3200) Phaethon

Inversion Angle of Phase-polarization Curve of Near-Earth Asteroid (3200) Phaethon

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

Visible Spectroscopy from the Mission Accessible Near-Earth Object Survey (MANOS): Taxonomic Dependence on Asteroid Size

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