Highlights 2016

Jun 06, 2016
Star formation in the filamentary Aquila and Taurus molecular clouds

Based on observations of nearby molecular clouds with the Herschel space observatory, recently large samples of future stars were detected in the form of dense cores. The properties of these compact seeds and their connection with interstellar filaments reveal us the earliest key stages of stars and the way of low-mass star formation.

Among several cloud complexes along the Gould Belt (see image below) the Aquila and Taurus regions were targeted. While the star formation in Aquila was relatively unexplored until recently, the Taurus cloud with its main filaments is well known. The Aquila Rift lies above the Galactic plane at the distance of about 260 parsec (approximately 850 light-years from the Sun). The Taurus region is more nearby, it seems to sit in the wall of the Local Bubble - a cavity, surrounding the Solar System- at 140 parsec (or 450 light-years) from us. 

Jun 23, 2016
An instability to trigger the initial rotation of a neutron star.

The birth spin of a neutron star is a key parameter to better understand the nature of its progenitor as well as the dynamical processes at play during the collapse of a massive star. However, the distribution of initial pulsar spins is poorly known. A study led by R. Kazeroni from SAP/CEA and his collaborators, using numerical simulations, emphasized the efficiency of a hydrodynamic instability named “SASI” to impart a rotational velocity to the neutron star. Surprisingly, the simulations show that, in some cases, the direction of rotation of the compact object is opposite to the perturbation which triggers the rotation. These results are published in the journal Monthly Notices of the Royal Astronomical Society.

 

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