Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties

G. Borisov, M. Devogèle, A. Cellino, S. Bagnulo, A. Christou, Ph Bendjoya, J. P. Rivet, L. Abe, D. Vernet, Z. Donchev, Yu Krugly, I. Belskaya, T. Bonev, D. Steeghs, D. Galloway, V. Dhillon, P. O'Brien, D. Pollacco, S. Poshyachinda, G. RamsayE. Thrane, K. Ackley, E. Rol, K. Ulaczyk, R. Cutter, M. Dyer

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

Asteroid (3200) Phaethon is a Near-Earth Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other known asteroid. Its last close approach to the Earth was in 2017 mid-December and the next one will be on 2026 October. Previous rotationally time-resolved spectroscopy of Phaethon showed that its spectral slope is slightly bluish, in agreement with its B/F taxonomic classification, but at some rotational phases, it changes to slightly reddish. Motivated by this result, we performed time-resolved imaging polarimetry of Phaethon during its recent close approach to the Earth. Phaethon has a spin period of 3.604 h, and we found a variation of the linear polarization with rotation. This seems to be a rare case in which such variation is unambiguously found, also a consequence of its fairly large amplitude. Combining this new information with the brightness and colour variation as well as previously reported results from Arecibo radar observations, we conclude that there is no variation of the mineralogy across the surface of Phaeton. However, the observed change in the linear polarization may be related to differences in the thickness of the surface regolith in different areas or local topographic features.

Original languageEnglish
Pages (from-to)L131-L135
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume480
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Asteroids: individual: (3200) Phaethon
  • Minor planets
  • Polarization
  • Techniques: photometric
  • Techniques: polarimetric

Cite this

Borisov, G. ; Devogèle, M. ; Cellino, A. ; Bagnulo, S. ; Christou, A. ; Bendjoya, Ph ; Rivet, J. P. ; Abe, L. ; Vernet, D. ; Donchev, Z. ; Krugly, Yu ; Belskaya, I. ; Bonev, T. ; Steeghs, D. ; Galloway, D. ; Dhillon, V. ; O'Brien, P. ; Pollacco, D. ; Poshyachinda, S. ; Ramsay, G. ; Thrane, E. ; Ackley, K. ; Rol, E. ; Ulaczyk, K. ; Cutter, R. ; Dyer, M. / Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties. In: Monthly Notices of the Royal Astronomical Society: Letters. 2018 ; Vol. 480, No. 1. pp. L131-L135.
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title = "Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties",
abstract = "Asteroid (3200) Phaethon is a Near-Earth Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other known asteroid. Its last close approach to the Earth was in 2017 mid-December and the next one will be on 2026 October. Previous rotationally time-resolved spectroscopy of Phaethon showed that its spectral slope is slightly bluish, in agreement with its B/F taxonomic classification, but at some rotational phases, it changes to slightly reddish. Motivated by this result, we performed time-resolved imaging polarimetry of Phaethon during its recent close approach to the Earth. Phaethon has a spin period of 3.604 h, and we found a variation of the linear polarization with rotation. This seems to be a rare case in which such variation is unambiguously found, also a consequence of its fairly large amplitude. Combining this new information with the brightness and colour variation as well as previously reported results from Arecibo radar observations, we conclude that there is no variation of the mineralogy across the surface of Phaeton. However, the observed change in the linear polarization may be related to differences in the thickness of the surface regolith in different areas or local topographic features.",
keywords = "Asteroids: individual: (3200) Phaethon, Minor planets, Polarization, Techniques: photometric, Techniques: polarimetric",
author = "G. Borisov and M. Devog{\`e}le and A. Cellino and S. Bagnulo and A. Christou and Ph Bendjoya and Rivet, {J. P.} and L. Abe and D. Vernet and Z. Donchev and Yu Krugly and I. Belskaya and T. Bonev and D. Steeghs and D. Galloway and V. Dhillon and P. O'Brien and D. Pollacco and S. Poshyachinda and G. Ramsay and E. Thrane and K. Ackley and E. Rol and K. Ulaczyk and R. Cutter and M. Dyer",
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Borisov, G, Devogèle, M, Cellino, A, Bagnulo, S, Christou, A, Bendjoya, P, Rivet, JP, Abe, L, Vernet, D, Donchev, Z, Krugly, Y, Belskaya, I, Bonev, T, Steeghs, D, Galloway, D, Dhillon, V, O'Brien, P, Pollacco, D, Poshyachinda, S, Ramsay, G, Thrane, E, Ackley, K, Rol, E, Ulaczyk, K, Cutter, R & Dyer, M 2018, 'Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties', Monthly Notices of the Royal Astronomical Society: Letters, vol. 480, no. 1, pp. L131-L135. https://doi.org/10.1093/mnrasl/sly140

Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties. / Borisov, G.; Devogèle, M.; Cellino, A.; Bagnulo, S.; Christou, A.; Bendjoya, Ph; Rivet, J. P.; Abe, L.; Vernet, D.; Donchev, Z.; Krugly, Yu; Belskaya, I.; Bonev, T.; Steeghs, D.; Galloway, D.; Dhillon, V.; O'Brien, P.; Pollacco, D.; Poshyachinda, S.; Ramsay, G.; Thrane, E.; Ackley, K.; Rol, E.; Ulaczyk, K.; Cutter, R.; Dyer, M.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 480, No. 1, 01.01.2018, p. L131-L135.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties

AU - Borisov, G.

AU - Devogèle, M.

AU - Cellino, A.

AU - Bagnulo, S.

AU - Christou, A.

AU - Bendjoya, Ph

AU - Rivet, J. P.

AU - Abe, L.

AU - Vernet, D.

AU - Donchev, Z.

AU - Krugly, Yu

AU - Belskaya, I.

AU - Bonev, T.

AU - Steeghs, D.

AU - Galloway, D.

AU - Dhillon, V.

AU - O'Brien, P.

AU - Pollacco, D.

AU - Poshyachinda, S.

AU - Ramsay, G.

AU - Thrane, E.

AU - Ackley, K.

AU - Rol, E.

AU - Ulaczyk, K.

AU - Cutter, R.

AU - Dyer, M.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Asteroid (3200) Phaethon is a Near-Earth Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other known asteroid. Its last close approach to the Earth was in 2017 mid-December and the next one will be on 2026 October. Previous rotationally time-resolved spectroscopy of Phaethon showed that its spectral slope is slightly bluish, in agreement with its B/F taxonomic classification, but at some rotational phases, it changes to slightly reddish. Motivated by this result, we performed time-resolved imaging polarimetry of Phaethon during its recent close approach to the Earth. Phaethon has a spin period of 3.604 h, and we found a variation of the linear polarization with rotation. This seems to be a rare case in which such variation is unambiguously found, also a consequence of its fairly large amplitude. Combining this new information with the brightness and colour variation as well as previously reported results from Arecibo radar observations, we conclude that there is no variation of the mineralogy across the surface of Phaeton. However, the observed change in the linear polarization may be related to differences in the thickness of the surface regolith in different areas or local topographic features.

AB - Asteroid (3200) Phaethon is a Near-Earth Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other known asteroid. Its last close approach to the Earth was in 2017 mid-December and the next one will be on 2026 October. Previous rotationally time-resolved spectroscopy of Phaethon showed that its spectral slope is slightly bluish, in agreement with its B/F taxonomic classification, but at some rotational phases, it changes to slightly reddish. Motivated by this result, we performed time-resolved imaging polarimetry of Phaethon during its recent close approach to the Earth. Phaethon has a spin period of 3.604 h, and we found a variation of the linear polarization with rotation. This seems to be a rare case in which such variation is unambiguously found, also a consequence of its fairly large amplitude. Combining this new information with the brightness and colour variation as well as previously reported results from Arecibo radar observations, we conclude that there is no variation of the mineralogy across the surface of Phaeton. However, the observed change in the linear polarization may be related to differences in the thickness of the surface regolith in different areas or local topographic features.

KW - Asteroids: individual: (3200) Phaethon

KW - Minor planets

KW - Polarization

KW - Techniques: photometric

KW - Techniques: polarimetric

UR - http://www.scopus.com/inward/record.url?scp=85053378229&partnerID=8YFLogxK

U2 - 10.1093/mnrasl/sly140

DO - 10.1093/mnrasl/sly140

M3 - Article

AN - SCOPUS:85053378229

VL - 480

SP - L131-L135

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

ER -