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

Capria, M. T.; Cremonese, G.; Bhardwaj, Anil; Sanctis, M. C. De; Epifani, E. Mazzotta

doi:10.1051/0004-6361:20077072

Cited by 16 publications

(16 citation statements)

References 44 publications

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“…This is the reason why the study of these lines is interesting. We catalogue them in the comets we have observed until now (Saba et al 2005;Cremonese et al 2007;Capria et al 2008), looking for possible correlations with the heliocentric distance and other observation parameters, with the long-term aim of attempting or suggesting possible identifications. Many of the lines labeled as unidentified in the 17P/ Holmes spectra are detectable in the corresponding spectra of the other comets we have observed at closer distances from the Sun, while some of them have not been previously detected.…”

Section: Discussionmentioning

confidence: 99%

High resolution observation of 17P/ Holmes during the outburst event in 2007

Capria

Cremonese

Sanctis

2010

A&A

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Aims. On October 24, 2007 the comet 17P/ Holmes underwent an outburst that was extraordinary in both duration and size. We attempted to determine the cause of the outburst by acquiring and analyzing high resolution spectra of the comet. Methods. On two nights, October 25 and December 2, we acquired four high resolution spectra in the visible range at the Telescopio Nazionale Galileo in La Palma. The oxygen lines intensity ratio was estimated for the observation performed on October 25, and computed for the observation performed on December 2. Results. Many emission lines were detected in the spectra, most of them attributable to C 2 , NH 2 , CN and CH. The atomic O green line and one of the red doublet lines were detected in a spectrum acquired on October 25. All the three atomic O lines were detected in a spectrum acquired on December 2. The value obtained for the first night, 0.1 ± 0.11, implies that the H 2 O molecule was the main parent of the emission lines, while the value obtained for the second night, 0.3 ± 0.1, implies that the main parent was CO or CO 2 instead than H 2 O. Conclusions. Our results imply that in the days around the outburst the water production was exceptionally high for that heliocentric distance. By December, however, the behavior of 17P/ Holmes had returned to that of a comet orbiting at 2.6 AU from the Sun, in which state the activity is probably sustained mostly by gases more volatile than water, such as CO and CO 2 .

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Section: Discussionmentioning

confidence: 99%

High resolution observation of 17P/ Holmes during the outburst event in 2007

Capria

Cremonese

Sanctis

2010

A&A

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“…These are listed in Table V. The three oldest observations all suffered from non-simultaneity of the observations of the three lines. Indeed, the Halley and Hyakutake observations reported in Table V Capria et al (2008) each contain observations of only 1 line of the red doublet. Thus, these observations should be used cautiously.…”

Section: Discussionmentioning

confidence: 99%

Atomic oxygen in the comae of comets

Cochran

2008

Icarus

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We report on the detection of atomic oxygen lines in the spectra of 8 comets. These forbidden lines are a result of the photodissociation of the parent oxygen-bearing species directly into an excited state. We used high resolution spectra obtained at the McDonald Observatory 2.7m telescope to resolve the cometary oxygen lines from the telluric oxygen lines and from other cometary emissions. We find that the relative intensities of the two red lines (6300.304 and 6363.776Å) are consistent with theory. The green line (5577.339Å) has an intensity which is about 10% of the sum of the intensities of the two red lines. We show that collisional quenching may be important in the inner coma. If we assume the relative excitation rates of potential parents which have appeared in the literature, then H 2 O would be the parent of the cometary green oxygen line. However, those rates have been questioned. We measured the width of the three oxygen lines and find that the green line is wider than either of the two red lines. The finding of a wider line could imply a different parent for the green and red lines. However, the constancy of the green to red line flux ratio suggests the parent is the same for these lines but that the exciting photons have different energies.

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“…Examples of the types of studies performed are 12 C/ 13 C (Danks et al 1974;Kleine et al 1995), 14 N/ 15 N (Arpigny et al 2003;Manfroid et al 2005Manfroid et al , 2009 and O ( 1 S/ 1 D) (Cochran and Cochran 2001;Festou and Feldman 1981;Capria et al 2005Capria et al , 2008McKay et al 2012Decock et al 2013Decock et al , 2015.…”

Section: Optical Observationsmentioning

confidence: 99%

The Composition of Comets

Cochran¹,

et al. 2015

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This paper is the result of the International Cometary Workshop, held in Toulouse, France in April 2014, where the participants came together to assess our knowledge of comets prior to the ESA Rosetta Mission. In this paper, we look at the composition of the gas and dust from the comae of comets. With the gas, we cover the various taxonomic studies that have broken comets into groups and compare what is seen at all wavelengths. We also discuss what has been learned from mass spectrometers during flybys. A few caveats for our interpretation are discussed. With dust, much of our information comes from flybys. They include {\it in situ} analyses as well as samples returned to Earth for laboratory measurements. Remote sensing IR observations and polarimetry are also discussed. For both gas and dust, we discuss what instruments the Rosetta spacecraft and Philae lander will bring to bear to improve our understanding of comet 67P/Churyumov-Gerasimenko as "ground-truth" for our previous comprehensive studies. Finally, we summarize some of the initial Rosetta Mission findings.Comment: To appear in Space Science Review

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

Cited by 16 publications

References 44 publications

High resolution observation of 17P/ Holmes during the outburst event in 2007

High resolution observation of 17P/ Holmes during the outburst event in 2007

Atomic oxygen in the comae of comets

The Composition of Comets

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