Recent spatially-resolved ALMA observations of Elias 2-27 have revealed the stunning structure of the stars disk: it contains two enormous, symmetric spiral arms, as well as additional features interior to the spirals.What caused the disk to develop this structure? Led by Farzana Meru, a group of Institute of Astronomy researchers has run a series of simulations that explore different ways that Elias 2-27s disk might have evolved into the shape we see today.Modeling a DiskMeru and collaborators performed a total of 72 three-dimensional smoothed particle hydrodynamics simulations tracking 250,000 gas particles in a model disk around a star like Elias 2-27. But these new images require new models and interpretations!Case in point: Elias 2-27 is a low-mass star thats only a million years old and is surrounded by an unusually massive disk of gas and dust. ALMA-Imaged Spiral ArmsWith the dawn of new telescopes such as the Atacama Large Millimeter/submillimeter Array, were now able to study the birth of young stars and their newly forming planetary systems in more detail than ever before. Bottom: a deprojection of the top image (i.e., what the system would look like face-on). Two symmetric spiral arms, a bright inner ellipse, and two dark crescents are clearly visible. A team of scientists from University of Cambridges Institute of Astronomy has now examined what might cause this disks appearance.Top: ALMA 1.3-mm observations of Elias 2-27s spiral arms, processed with an unsharp masking filter. ![]() The young star Elias 2-27 is surrounded by a massive disk with spectacular spiral arms. In Section IV the Beta Induced X-Ray Spectroscopy (BIXS) as method of choice to monitor the tritium activity of the KATRIN source is described and first results are presented.« less After a brief overview of the KATRIN experiment in Section II the CMS is introduced in Section III. This contribution presents the status of the KATRINmore » experiment, thereby focusing on its Calibration and Monitoring System (CMS), which is the last component being subject to research/development. KATRIN will use a source of ultrapure molecular tritium. KATRIN will allow a model-independent measurement of the neutrino mass scale with an expected sensitivity of 0.2 eV/c (90% CL). Within an international collaboration the Karlsruhe Tritium Neutrino experiment ( KATRIN) is currently being built up at KIT. Tritium is the nucleus of choice because of its low endpoint energy, superallowed decay and simple atomic structure. The most sensitive way to determine the neutrino mass scale without further assumptions is to measure the shape of a tritium beta spectrum near its kinematic end-point. Status of the neutrino mass experiment KATRINĭOE Office of Scientific and Technical Information (OSTI.GOV)īornschein, L.
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