Skip to main content Accessibility help
×
Home

High-excitation molecular lines from circumstellar disks

  • Gerd-Jan van Zadelhoff (a1), Ewine F. van Dishoeck (a1), Wing-Fai Thi (a1) and Geoffrey A. Blake (a2)

Abstract

Observations of submillimeter lines of CO, HCO+, HCN and their isotopes from circumstellar disks around low-mass pre-main sequence stars can be used to set constraints on the temperature and density distributions in these disks. The lines considered here originate from levels with higher excitation temperatures and critical densities than studied before (CO 6–5, HCO+ and HCN 4–3), and are combined with interferometer data on lower excitation lines. We discuss the results for two disks, i.e., those around LkCa 15 and TW Hya. We find that the TW Hya disk has a warm surface layer and agrees well with a flaring disk geometry, while the LkCa 15 disk is cooler and can be described by either dust-settling in a flared disk or a flatter disk overall. The densities are well described by disk models in the literature.

    • 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.

      High-excitation molecular lines from circumstellar disks
      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.

      High-excitation molecular lines from circumstellar disks
      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.

      High-excitation molecular lines from circumstellar disks
      Available formats
      ×

Copyright

References

Hide All
D'Alessio, P., Canto, J., Hartmann, L., Calvet, N. & Lizano, S. 1999, ApJ, 511, 896.
Beckwith, S. V. W., & Sargent, A. I. 1996, Nature, 383, 139.
Bell, K. R. 1999, ApJ, 526, 411.
Chiang, E. I., & Goldreich, P. 1997, ApJ, 490, 368.
Jansen, D. J., van Dishoeck, E. F., Keene, J., Boreiko, R. T., Betz, , & L, A. 1996, A&A, 309, 899.
Kastner, J. H., Zuckerman, B., Weintraub, D. A., & Forveille, T. 1997, Science, 277, 67.
Kenyon, S. J., & Hartmann, L. 1987, ApJ, 323, 714.
Qi, C. 2000, , California Institute of Technology.
van Zadelhoff, G. J., van Dishoeck, E.F., Thi, W.F., & Blake, G.A. 2001, A&A, submitted.

High-excitation molecular lines from circumstellar disks

  • Gerd-Jan van Zadelhoff (a1), Ewine F. van Dishoeck (a1), Wing-Fai Thi (a1) and Geoffrey A. Blake (a2)

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