Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

F. Moreno; D. Guirado; O. Munoz; I. Bertini; C. Tubiana; C. Güttler; M. Fulle; A. Rotundi; V. Della Corte; S. L. Ivanovski; G. Rinaldi; D. Bockelée-Morvan; V. V. Zakharov; J. Agarwal; S. Mottola; I. Toth; E. Frattin; L. M. Lara; P. J. Gutiérrez; Z. Y. Lin; L. Kolokolova; H. Sierks; G. Naletto; P. L. Lamy; R. Rodrigo; D. Koschny; B. Davidsson; M. A. Barucci; J. L. Bertaux; D. Bodewits; G. Cremonese; V. Da Deppo; S. Debei; M. De Cecco; J. Deller; S. Fornasier; W. H. Ip; H. U. Keller; M. Lazzarin; J. J. López-Moreno; F. Marzari; X. Shi

doi:10.3847/1538-3881/aae526

Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

F. Moreno, D. Guirado, O. Munoz, I. Bertini, C. Tubiana, C. Güttler, M. Fulle, A. Rotundi, V. Della Corte, S. L. Ivanovski, G. Rinaldi, D. Bockelée-Morvan, V. V. Zakharov, J. Agarwal, S. Mottola, I. Toth, E. Frattin, L. M. Lara, P. J. Gutiérrez, Z. Y. LinL. Kolokolova, H. Sierks, G. Naletto, P. L. Lamy, R. Rodrigo, D. Koschny, B. Davidsson, M. A. Barucci, J. L. Bertaux, D. Bodewits, G. Cremonese, V. Da Deppo, S. Debei, M. De Cecco, J. Deller, S. Fornasier, W. H. Ip, H. U. Keller, M. Lazzarin, J. J. López-Moreno, F. Marzari, X. Shi

Graduate Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images. This function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly oriented aggregate particles. We show, however, that an ensemble of oriented elongated particles of a wide variety of aspect ratios, with radii r 10 μm, and whose long axes are perpendicular to the direction of the solar radiation, are capable of reproducing the observed phase function. These particles must be absorbing, with an imaginary part of the refractive index of about 0.1 to match the expected geometric albedo, and with porosity in the 60%-70% range.

Original language	English
Article number	237
Journal	Astronomical Journal
Volume	156
Issue number	5
DOIs	https://doi.org/10.3847/1538-3881/aae526
State	Published - Nov 2018

Keywords

methods: numerical
minor planets, asteroids: individual (67P/Churyumov-Gerasimenko)

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10.3847/1538-3881/aae526

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Moreno, F., Guirado, D., Munoz, O., Bertini, I., Tubiana, C., Güttler, C., Fulle, M., Rotundi, A., Della Corte, V., Ivanovski, S. L., Rinaldi, G., Bockelée-Morvan, D., Zakharov, V. V., Agarwal, J., Mottola, S., Toth, I., Frattin, E., Lara, L. M., Gutiérrez, P. J., ... Shi, X. (2018). Models of Rosetta/OSIRIS 67P Dust Coma Phase Function. Astronomical Journal, 156(5), [237]. https://doi.org/10.3847/1538-3881/aae526

@article{aab76d24acfb49ad8b9272238acec0b7,

title = "Models of Rosetta/OSIRIS 67P Dust Coma Phase Function",

abstract = "The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images. This function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly oriented aggregate particles. We show, however, that an ensemble of oriented elongated particles of a wide variety of aspect ratios, with radii r 10 μm, and whose long axes are perpendicular to the direction of the solar radiation, are capable of reproducing the observed phase function. These particles must be absorbing, with an imaginary part of the refractive index of about 0.1 to match the expected geometric albedo, and with porosity in the 60%-70% range.",

keywords = "methods: numerical, minor planets, asteroids: individual (67P/Churyumov-Gerasimenko)",

author = "F. Moreno and D. Guirado and O. Munoz and I. Bertini and C. Tubiana and C. G{\"u}ttler and M. Fulle and A. Rotundi and {Della Corte}, V. and Ivanovski, {S. L.} and G. Rinaldi and D. Bockel{\'e}e-Morvan and Zakharov, {V. V.} and J. Agarwal and S. Mottola and I. Toth and E. Frattin and Lara, {L. M.} and Guti{\'e}rrez, {P. J.} and Lin, {Z. Y.} and L. Kolokolova and H. Sierks and G. Naletto and Lamy, {P. L.} and R. Rodrigo and D. Koschny and B. Davidsson and Barucci, {M. A.} and Bertaux, {J. L.} and D. Bodewits and G. Cremonese and {Da Deppo}, V. and S. Debei and {De Cecco}, M. and J. Deller and S. Fornasier and Ip, {W. H.} and Keller, {H. U.} and M. Lazzarin and L{\'o}pez-Moreno, {J. J.} and F. Marzari and X. Shi",

year = "2018",

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doi = "10.3847/1538-3881/aae526",

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volume = "156",

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Moreno, F, Guirado, D, Munoz, O, Bertini, I, Tubiana, C, Güttler, C, Fulle, M, Rotundi, A, Della Corte, V, Ivanovski, SL, Rinaldi, G, Bockelée-Morvan, D, Zakharov, VV, Agarwal, J, Mottola, S, Toth, I, Frattin, E, Lara, LM, Gutiérrez, PJ, Lin, ZY, Kolokolova, L, Sierks, H, Naletto, G, Lamy, PL, Rodrigo, R, Koschny, D, Davidsson, B, Barucci, MA, Bertaux, JL, Bodewits, D, Cremonese, G, Da Deppo, V, Debei, S, De Cecco, M, Deller, J, Fornasier, S, Ip, WH, Keller, HU, Lazzarin, M, López-Moreno, JJ, Marzari, F & Shi, X 2018, 'Models of Rosetta/OSIRIS 67P Dust Coma Phase Function', Astronomical Journal, vol. 156, no. 5, 237. https://doi.org/10.3847/1538-3881/aae526

TY - JOUR

T1 - Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

AU - Moreno, F.

AU - Guirado, D.

AU - Munoz, O.

AU - Bertini, I.

AU - Tubiana, C.

AU - Güttler, C.

AU - Fulle, M.

AU - Rotundi, A.

AU - Della Corte, V.

AU - Ivanovski, S. L.

AU - Rinaldi, G.

AU - Bockelée-Morvan, D.

AU - Zakharov, V. V.

AU - Agarwal, J.

AU - Mottola, S.

AU - Toth, I.

AU - Frattin, E.

AU - Lara, L. M.

AU - Gutiérrez, P. J.

AU - Lin, Z. Y.

AU - Kolokolova, L.

AU - Sierks, H.

AU - Naletto, G.

AU - Lamy, P. L.

AU - Rodrigo, R.

AU - Koschny, D.

AU - Davidsson, B.

AU - Barucci, M. A.

AU - Bertaux, J. L.

AU - Bodewits, D.

AU - Cremonese, G.

AU - Da Deppo, V.

AU - Debei, S.

AU - De Cecco, M.

AU - Deller, J.

AU - Fornasier, S.

AU - Ip, W. H.

AU - Keller, H. U.

AU - Lazzarin, M.

AU - López-Moreno, J. J.

AU - Marzari, F.

AU - Shi, X.

PY - 2018/11

Y1 - 2018/11

N2 - The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images. This function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly oriented aggregate particles. We show, however, that an ensemble of oriented elongated particles of a wide variety of aspect ratios, with radii r 10 μm, and whose long axes are perpendicular to the direction of the solar radiation, are capable of reproducing the observed phase function. These particles must be absorbing, with an imaginary part of the refractive index of about 0.1 to match the expected geometric albedo, and with porosity in the 60%-70% range.

AB - The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images. This function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly oriented aggregate particles. We show, however, that an ensemble of oriented elongated particles of a wide variety of aspect ratios, with radii r 10 μm, and whose long axes are perpendicular to the direction of the solar radiation, are capable of reproducing the observed phase function. These particles must be absorbing, with an imaginary part of the refractive index of about 0.1 to match the expected geometric albedo, and with porosity in the 60%-70% range.

KW - methods: numerical

KW - minor planets, asteroids: individual (67P/Churyumov-Gerasimenko)

UR - http://www.scopus.com/inward/record.url?scp=85056721911&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aae526

DO - 10.3847/1538-3881/aae526

M3 - 期刊論文

AN - SCOPUS:85056721911

SN - 0004-6256

VL - 156

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

M1 - 237

ER -

Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

Abstract

Keywords

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