Strange water — the source of water in our solar system

Featured Image: The star-forming nebula W51 is one of the largest “star factories” in the Milky Way galaxy, NASA/JPL, Public Domain (CC0)

Paper: Origin of hydrogen isotopic variations in chondritic water and organics

Authors: L. Piani, Y. Marrocchi L.G.Vacher H. Yurimoto M. Bizzarro

Vast blue oceans, swirly rain or fluffy white snow – water is ubiquitous on Earth. But where does the water of our solar system come from?

A group of researchers were able to investigate the isotopic composition of water in different components of meteorites. Their findings hint that some of the water on Earth may have originated from a source beyond the solar system.

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Capturing Early Sun within meteorite inclusions

Paper: Astronomical context of solar system formation from molybdenum isotopes in meteorite inclusions.

Featured image: Artistic impression of the protoplanetary disk. Image used with permission from Wikipedia (A. Angelich).

Authors: Gregory A. Brennecka, Christoph Burkhardt, Gerrit Budde, Thomas S. Kruijer, Francis Nimmo, Thorsten Kleine.

If you ask a cosmochemist what the oldest objects in the solar system are, they will swiftly answer the Calcium Aluminium Inclusions (CAIs), a small light-coloured inclusion within primitive meteorites known as Chondrites (see figure 2C). However, if you ask what event in the solar system evolution CAIs correspond to, it is a more challenging question. Previously, CAI formation was associated with the various evolutionary stages of our Sun.  However, as the timescale of evolution of Sun, calculated to be around 1 million years by observing Sun like stars, is longer than the CAI forming period (~ 40,000 – 200,000 years), the association between CAI formation and the early stages of our Sun is not always clear. In a quest to put the CAI formation in an astronomical context, a recent study from Brennecka et al. analysed CAIs present within various Carbonaceous chondrite meteorites and linked the CAI formation to a specific stage in the Sun’s evolution.

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