Skip to main content Accessibility help
×
×
Home

Measuring the Distribution and Excitation of Cometary CH3OH Using ALMA

  • M. A. Cordiner (a1), S. B. Charnley (a1), M. J. Mumma (a1), D. Bockelée-Morvan (a2), N. Biver (a2), G. Villanueva (a1), L. Paganini (a1), S. N. Milam (a1), A. J. Remijan (a3), D. C. Lis (a4), J. Crovisier (a2), J. Boissier (a5), Y.-J. Kuan (a6) and I. M. Coulson (a7)...

Abstract

The Atacama Large Millimeter/submillimeter Array (ALMA) was used to obtain measurements of spatially and spectrally resolved CH3OH emission from comet C/2012 K1 (PanSTARRS) on 28-29 June 2014. Detection of 12-14 emission lines of CH3OH on each day permitted the derivation of spatially-resolved rotational temperature profiles (averaged along the line of sight), for the innermost 5000 km of the coma. On each day, the CH3OH distribution was centrally peaked and approximately consistent with spherically symmetric, uniform outflow. The azimuthally-averaged CH3OH rotational temperature (T rot) as a function of sky-projected nucleocentric distance (ρ), fell by about 40 K between ρ= 0 and 2500 km on 28 June, whereas on 29 June, T rot fell by about 50 K between ρ =0 km and 1500 km. A remarkable (~50 K) rise in T rot at ρ = 1500-2500 km on 29 June was not present on 28 June. The observed variations in CH3OH rotational temperature are interpreted primarily as a result of variations in the coma kinetic temperature due to adiabatic cooling, and heating through Solar irradiation, but collisional and radiative non-LTE excitation processes also play a role.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Measuring the Distribution and Excitation of Cometary CH3OH Using ALMA
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Measuring the Distribution and Excitation of Cometary CH3OH Using ALMA
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Measuring the Distribution and Excitation of Cometary CH3OH Using ALMA
      Available formats
      ×

Copyright

References

Hide All
Bockelée-Morvan, D., Crovisier, J., Colom, P., & Despois, D. 1994, A&A, 287, 647
Bonev, B. P., Villanueva, G. L., Paganini, L. et al. 2013, Icarus, 222, 740
Cordiner, M. A., Remijan, A. J., Boissier, J. et al. 2014, ApJ, 792, L2
Cummins, S. E., Linke, R. A., & Thaddeus, P. 1986, ApJS, 60, 819
DiSanti, M. A., Bonev, B. P., Magee-Sauer, K. et al. 2006, ApJ, 650, 470
Rodgers, S. D., Charnley, S. B., Huebner, W. F., & Boice, D. C. 2005, Comets II, eds. Festou, M. C., Keller, H. U. & Weaver, W. A., Univ. Arizona, Tucson, p 505
Fougere, N., Combi, M. R., & Tenishev, V. 2012, Icarus, 221, 174
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×
MathJax

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed