Author/Authors :
Feldman، نويسنده , , Paul D. and Stern، نويسنده , , S. Alan and Steffl، نويسنده , , Andrew J. and Parker، نويسنده , , Joel Wm. and Slater، نويسنده , , David C. and AʹHearn، نويسنده , , Michael F. and Bertaux، نويسنده , , Jean-Loup and Festou، نويسنده , , Michel C.، نويسنده ,
Abstract :
We report on spectroscopic observations of periodic Comet 9P/Tempel 1 by the Alice ultraviolet spectrograph on the Rosetta spacecraft in conjunction with NASAʹs Deep Impact mission. Our objectives were to measure an increase in atomic and molecular emissions produced by the excavation of volatile sub-surface material. We unambiguously detected atomic oxygen emission from the quiescent coma but no enhancement at the 10% (1-σ) level following the impact. We derive a quiescent H2O production rate of 9 × 10 27 molecules s−1 with an estimated uncertainty of ∼30%. Our upper limits to the volatiles produced by the impact are consistent with other estimates.
