67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio
- K. Altwegg, H. Balsiger, P. Wurz
- Geology, PhysicsScience
- 23 January 2015
The direct in situ measurement of the D/H ratio in the Jupiter family comet 67P/Churyumov-Gerasimenko by the ROSINA mass spectrometer aboard the European Space Agency's Rosetta spacecraft is found to be (5.3 ± 0.7) × 10−4—that is, approximately three times the terrestrial value.
Abundant molecular oxygen in the coma of comet 67P/Churyumov–Gerasimenko
- A. Bieler, K. Altwegg, P. Wurz
- Geology, PhysicsNature
- 29 October 2015
The observations indicate that the O2/H2O ratio is isotropic in the coma and does not change systematically with heliocentric distance, which suggests that primordial O2 was incorporated into the nucleus during the comet’s formation, which is unexpected given the low upper limits from remote sensing observations.
Molecular nitrogen in comet 67P/Churyumov-Gerasimenko indicates a low formation temperature
- M. Rubin, K. Altwegg, P. Wurz
- Physics, GeologyScience
- 10 April 2015
Direct measurements of N2 by instruments aboard the Rosetta spacecraft provide clues about the comet’s long history and depletion of molecular nitrogen at levels that are depleted compared to those in the primordial solar system suggests that the comet formed at low-temperature conditions below ~30 kelvin.
Liquid water on Enceladus from observations of ammonia and 40Ar in the plume
This corrects the article DOI: 10.1038/nature08153
Liquid water on Enceladus from observations of ammonia and 40Ar in the plume
Jets of water ice from surface fractures near the south pole of Saturn’s icy moon Enceladus produce a plume of gas and particles. The source of the jets may be a liquid water region under the ice…
Time variability and heterogeneity in the coma of 67P/Churyumov-Gerasimenko
- M. Hässig, K. Altwegg, P. Wurz
- Physics, GeologyScience
- 23 January 2015
Rosetta Orbiter Spectrometer for Ion and Neutral Analysis onboard the Rosetta spacecraft has measured the coma composition of comet 67P/Churyumov-Gerasimenko with well-sampled time resolution per rotation, indicating a complex coma-nucleus relationship.
A POSSIBLE CARBON-RICH INTERIOR IN SUPER-EARTH 55 Cancri e
- N. Madhusudhan, Kanani K. M. Lee, O. Mousis
- Geology, Physics
- 9 October 2012
Terrestrial planets in the solar system, such as the Earth, are oxygen-rich, with silicates and iron being the most common minerals in their interiors. However, the true chemical diversity of rocky…
Deuterium Fractionation: the Ariadne's Thread from the Pre-collapse Phase to Meteorites and Comets today
- C. Ceccarelli, P. Caselli, D. Semenov
- Physics, Geology
- 27 March 2014
The Solar System formed about 4.6 billion years ago from a condensation of matter inside a molecular cloud. Trying to reconstruct what happened is the goal of this chapter. For that, we put together…
Enrichments in Volatiles in Jupiter: A New Interpretation of the Galileo Measurements
- D. Gautier, F. Hersant, O. Mousis, J. Lunine
- Physics, Geology
- 21 March 2001
Using an evolutionary model of the solar nebula, we fit all enrichments in volatiles with respect to the solar abundance measured in Jupiter by the Galileo probe. We argue that volatiles were trapped…
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