Oxygen emission lines in the high resolution spectra of 9P/Tempel 1 following the Deep Impact event

Details Oxygen emission lines in the high resolution spectra of 9P/Tempel 1 following the Deep Impact event Oxygen emission lines in the high resolution spectra of 9P/Tempel 1 following the Deep Impact event

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...479..257c&link_type=abstract

Astronomy and Astrophysics, Volume 479, Issue 1, February III 2008, pp.257-263

Astronomy and Astrophysics

Astrophysics

5

Comets: Individual: 9P/Tempel 1, Comets: General

Scientific paper

Context: On 2005 July 4, the NASA spacecraft Deep Impact delivered an impactor on the comet 9P/Tempel 1 to study the material ejected from the nucleus. A worldwide observation campaign accompanied the mission, to characterize the activity of 9P/Tempel 1 before and after the impact. Aims: At La Palma (Canary Islands), the comet was observed from July 2 to July 9 using the echelle spectrograph SARG on the Telescopio Nazionale Galileo (TNG). Fifteen spectra were obtained with a resolving power of R=29 000 in the spectral range 4620-7920 Å. Many interesting emission lines can be found in this range, in particular the [OI] lines at 5577 Å ("green line”) and at 6300 and 6364 Å ("red doublet”). From the analysis of these lines it is possible to derive information on the processes that produce these emissions. Methods: The three atomic oxygen lines are clearly visible in most of the spectra. The intensity ratio between the green line and the sum of the red lines, indicative of the parent of these lines, was computed for 9 of the 15 spectra. The value of the intensity ratio for the night of July 5 was compared with the model results obtained from a coupled chemistry transport model. Results: The intensity ratio of green to red oxygen lines obtained from the observed spectra and the one derived from the model suggest water is the main parent of the [OI] emissions on comet 9P/Tempel 1.
Based
on observations collected at the Italian Telescopio Nazionale Galileo (TNG), operated on
the island of La Palma by the Centro Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish
Observatorio del Roque de Los Muchachos of the Instituto de Astrofisica de Canarias.

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