Spectral analysis of the Chandra comet survey

D. Bodewits, D.J. Christian, M. Torney, M. Dryer, C.M. Lisse, K. Dennerl, T.H. Zurbuchen, S.J. Wolk, A.G.G.M. Tielens, R. Hoekstra

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Abstract

Aims.We present results of the analysis of cometary X-ray spectra with an extended version of our charge exchange emission model (Bodewits et al. 2006). We have applied this model to the sample of 8 comets thus far observed with the Chandra X-ray observatory and ACIS spectrometer in the 300-1000 eV range. The surveyed comets are C/1999 S4 (LINEAR), C/1999 T1 (McNaught-Hartley), C/2000 WM1 (LINEAR), 153P/2002 (Ikeya-Zhang), 2P/2003 (Encke), C/2001 Q4 (NEAT), 9P/2005 (Tempel 1) and 73P/2006-B (Schwassmann-Wachmann 3) and the observations include a broad variety of comets, solar wind environments and observational conditions. Methods.The interaction model is based on state selective, velocity dependent charge exchange cross sections and is used to explore how cometary X-ray emission depend on cometary, observational and solar wind characteristics. It is further demonstrated that cometary X-ray spectra mainly reflect the state of the local solar wind. The current sample of Chandra observations was fit using the constrains of the charge exchange model, and relative solar wind abundances were derived from the X-ray spectra. Results.Our analysis showed that spectral differences can be ascribed to different solar wind states, as such identifying comets interacting with (I) fast, cold wind, (II), slow, warm wind and (III) disturbed, fast, hot winds associated with interplanetary coronal mass ejections. We furthermore predict the existence of a fourth spectral class, associated with the cool, fast high latitude wind.
LanguageEnglish
Pages1183-1195
Number of pages13
JournalAstronomy and Astrophysics
Volume469
Issue number3
DOIs
Publication statusPublished - Jul 2007

Fingerprint

comets
comet
spectral analysis
spectrum analysis
solar wind
charge exchange
x rays
coronal mass ejection
spectrometer
polar regions
observatory
cross section
observatories
spectrometers
cross sections
interactions
analysis

Keywords

  • x-ray
  • comets
  • Chandra
  • solar winds
  • velocity
  • spectral class
  • latitude wind

Cite this

Bodewits, D., Christian, D. J., Torney, M., Dryer, M., Lisse, C. M., Dennerl, K., ... Hoekstra, R. (2007). Spectral analysis of the Chandra comet survey. Astronomy and Astrophysics, 469(3), 1183-1195. https://doi.org/10.1051/0004-6361:20077410
Bodewits, D. ; Christian, D.J. ; Torney, M. ; Dryer, M. ; Lisse, C.M. ; Dennerl, K. ; Zurbuchen, T.H. ; Wolk, S.J. ; Tielens, A.G.G.M. ; Hoekstra, R. / Spectral analysis of the Chandra comet survey. In: Astronomy and Astrophysics. 2007 ; Vol. 469, No. 3. pp. 1183-1195.
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abstract = "Aims.We present results of the analysis of cometary X-ray spectra with an extended version of our charge exchange emission model (Bodewits et al. 2006). We have applied this model to the sample of 8 comets thus far observed with the Chandra X-ray observatory and ACIS spectrometer in the 300-1000 eV range. The surveyed comets are C/1999 S4 (LINEAR), C/1999 T1 (McNaught-Hartley), C/2000 WM1 (LINEAR), 153P/2002 (Ikeya-Zhang), 2P/2003 (Encke), C/2001 Q4 (NEAT), 9P/2005 (Tempel 1) and 73P/2006-B (Schwassmann-Wachmann 3) and the observations include a broad variety of comets, solar wind environments and observational conditions. Methods.The interaction model is based on state selective, velocity dependent charge exchange cross sections and is used to explore how cometary X-ray emission depend on cometary, observational and solar wind characteristics. It is further demonstrated that cometary X-ray spectra mainly reflect the state of the local solar wind. The current sample of Chandra observations was fit using the constrains of the charge exchange model, and relative solar wind abundances were derived from the X-ray spectra. Results.Our analysis showed that spectral differences can be ascribed to different solar wind states, as such identifying comets interacting with (I) fast, cold wind, (II), slow, warm wind and (III) disturbed, fast, hot winds associated with interplanetary coronal mass ejections. We furthermore predict the existence of a fourth spectral class, associated with the cool, fast high latitude wind.",
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Bodewits, D, Christian, DJ, Torney, M, Dryer, M, Lisse, CM, Dennerl, K, Zurbuchen, TH, Wolk, SJ, Tielens, AGGM & Hoekstra, R 2007, 'Spectral analysis of the Chandra comet survey' Astronomy and Astrophysics, vol. 469, no. 3, pp. 1183-1195. https://doi.org/10.1051/0004-6361:20077410

Spectral analysis of the Chandra comet survey. / Bodewits, D.; Christian, D.J.; Torney, M.; Dryer, M.; Lisse, C.M.; Dennerl, K.; Zurbuchen, T.H.; Wolk, S.J.; Tielens, A.G.G.M.; Hoekstra, R.

In: Astronomy and Astrophysics, Vol. 469, No. 3, 07.2007, p. 1183-1195.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Spectral analysis of the Chandra comet survey

AU - Bodewits, D.

AU - Christian, D.J.

AU - Torney, M.

AU - Dryer, M.

AU - Lisse, C.M.

AU - Dennerl, K.

AU - Zurbuchen, T.H.

AU - Wolk, S.J.

AU - Tielens, A.G.G.M.

AU - Hoekstra, R.

PY - 2007/7

Y1 - 2007/7

N2 - Aims.We present results of the analysis of cometary X-ray spectra with an extended version of our charge exchange emission model (Bodewits et al. 2006). We have applied this model to the sample of 8 comets thus far observed with the Chandra X-ray observatory and ACIS spectrometer in the 300-1000 eV range. The surveyed comets are C/1999 S4 (LINEAR), C/1999 T1 (McNaught-Hartley), C/2000 WM1 (LINEAR), 153P/2002 (Ikeya-Zhang), 2P/2003 (Encke), C/2001 Q4 (NEAT), 9P/2005 (Tempel 1) and 73P/2006-B (Schwassmann-Wachmann 3) and the observations include a broad variety of comets, solar wind environments and observational conditions. Methods.The interaction model is based on state selective, velocity dependent charge exchange cross sections and is used to explore how cometary X-ray emission depend on cometary, observational and solar wind characteristics. It is further demonstrated that cometary X-ray spectra mainly reflect the state of the local solar wind. The current sample of Chandra observations was fit using the constrains of the charge exchange model, and relative solar wind abundances were derived from the X-ray spectra. Results.Our analysis showed that spectral differences can be ascribed to different solar wind states, as such identifying comets interacting with (I) fast, cold wind, (II), slow, warm wind and (III) disturbed, fast, hot winds associated with interplanetary coronal mass ejections. We furthermore predict the existence of a fourth spectral class, associated with the cool, fast high latitude wind.

AB - Aims.We present results of the analysis of cometary X-ray spectra with an extended version of our charge exchange emission model (Bodewits et al. 2006). We have applied this model to the sample of 8 comets thus far observed with the Chandra X-ray observatory and ACIS spectrometer in the 300-1000 eV range. The surveyed comets are C/1999 S4 (LINEAR), C/1999 T1 (McNaught-Hartley), C/2000 WM1 (LINEAR), 153P/2002 (Ikeya-Zhang), 2P/2003 (Encke), C/2001 Q4 (NEAT), 9P/2005 (Tempel 1) and 73P/2006-B (Schwassmann-Wachmann 3) and the observations include a broad variety of comets, solar wind environments and observational conditions. Methods.The interaction model is based on state selective, velocity dependent charge exchange cross sections and is used to explore how cometary X-ray emission depend on cometary, observational and solar wind characteristics. It is further demonstrated that cometary X-ray spectra mainly reflect the state of the local solar wind. The current sample of Chandra observations was fit using the constrains of the charge exchange model, and relative solar wind abundances were derived from the X-ray spectra. Results.Our analysis showed that spectral differences can be ascribed to different solar wind states, as such identifying comets interacting with (I) fast, cold wind, (II), slow, warm wind and (III) disturbed, fast, hot winds associated with interplanetary coronal mass ejections. We furthermore predict the existence of a fourth spectral class, associated with the cool, fast high latitude wind.

KW - x-ray

KW - comets

KW - Chandra

KW - solar winds

KW - velocity

KW - spectral class

KW - latitude wind

U2 - 10.1051/0004-6361:20077410

DO - 10.1051/0004-6361:20077410

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VL - 469

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JO - Astronomy and Astrophysics

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JF - Astronomy and Astrophysics

SN - 0004-6361

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ER -

Bodewits D, Christian DJ, Torney M, Dryer M, Lisse CM, Dennerl K et al. Spectral analysis of the Chandra comet survey. Astronomy and Astrophysics. 2007 Jul;469(3):1183-1195. https://doi.org/10.1051/0004-6361:20077410