Max-Planck-Institut für Sonnensystemforschung

The Flybys of Comets Tempel 1 and Hartley 2 Abstract: The flybys of comets T1 and H2, while short-lived, provide new insights and questions about cometary formation and evolution. The major results from the imager and IR spectrometer will be discussed, with particular emphasis on compositional inferences. [mehr]

67P Dust environment from GIADA and OSIRIS data Abstract: GIADA is continuously collecting dust since 11 August 2014. Although designed to work at comet distances much closer than those actually planned, thanks to dust loss rates higher than predicted, GIADA is measuring the impact momentum of about a dust grain per day. For the biggest samples, the grain cross section, bulk density and velocity vector has been also determined. These observations have been complemented by 48 OSIRIS single grain detections performed on 4 August 2014, allowing us to complete the dust size distribution up to the largest ejected sizes (actually, some cm). I will discuss results, dust-to-gas ratio and cross section distribution, with comparisons of predictions by the GIADA dust model (2010). [mehr]

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Acoustic glitches can be used to track the gradual expansion of solar-like stars in the main sequence and therefore they hold potential as a diagnosis of stellar age. I will present the age sensitivity of the glitches produced by the base of the outer convection zone and the second helium ionization zone in stellar models and show how they can deliver ages with precision < 10% when the mass and the composition of the star are known. [mehr]

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