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Different Origins or Different Evolutions? Decoding the Spectral Diversity Among C-type Asteroids

Jorda, L.; Lamy, P.; Groussin, O. +15 more

Anhydrous pyroxene-rich interplanetary dust particles (IDPs) have been proposed as surface analogs for about two-thirds of all C-complex asteroids. However, this suggestion appears to be inconsistent with the presence of hydrated silicates on the surfaces of some of these asteroids, including Ceres. Here, we report the presence of enstatite (pyrox…

D/H Ratios on Saturn and Jupiter from Cassini CIRS

Fletcher, L. N.; Lellouch, E.; Irwin, P. G. J. +7 more

We present new measurements of the deuterium abundance on Jupiter and Saturn, showing evidence that Saturn's atmosphere contains less deuterium than Jupiter's. We analyzed far-infrared spectra from the Cassini Composite Infrared Spectrometer to measure the abundance of HD on both giant planets. Our estimate of the Jovian D/H = (2.95 ± 0.55) × 10

On the Relation of Silicates and SiO Maser in Evolved Stars

Jiang, Biwei; Liu, Jiaming

The SiO molecule is one of the candidates for the seed of silicate dust in the circumstellar envelope of evolved stars, but this opinion is challenged. In this work we investigate the relation of the SiO maser emission power and the silicate dust emission power. With both our own observation by using the PMO/Delingha 13.7 m telescope and archive d…