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| http://dx.doi.org/10.1073/pnas.2221519120 | DOI Listing |
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A giant planet transiting a 3-Myr protostar with a misaligned disk.
Nature
November 2024
Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA.
Astronomers have found more than a dozen planets transiting stars that are 10-40 million years old, but younger transiting planets have remained elusive. The lack of such discoveries may be because planets have not fully formed at this age or because our view is blocked by the protoplanetary disk. However, we now know that many outer disks are warped or broken; provided the inner disk is depleted, transiting planets may thus be visible.
View Article and Find Full Text PDFStochastically structured illumination microscopy scan less super resolution imaging.
Npj Imaging
November 2024
Center for Life Nano- & Neuro-Science, Italian Institute of Technology, Rome, Italy.
In super-resolution, a varying illumination image stack is required. This enriched dataset typically necessitates precise mechanical control and micron-scale optical alignment and repeatability. Here, we introduce a novel methodology for super-resolution microscopy called stochastically structured illumination microscopy (SIM), which bypasses the need for illumination control exploiting instead the random, uncontrolled movement of the target object.
View Article and Find Full Text PDFInertial range of magnetorotational turbulence.
Sci Adv
August 2024
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aoba, Aramaki, Sendai 980-8578, Japan.
Accretion disks around compact stars are formed due to turbulence driven by magnetorotational instability. Despite over 30 years of numerous computational studies on magnetorotational turbulence, the properties of fluctuations in the inertial range-where cross-scale energy transfer dominates over energy injection-have remained elusive, primarily due to insufficient numerical resolution. Here, we report the highest-resolution simulation of magnetorotational turbulence ever conducted.
View Article and Find Full Text PDFSelecting optimal celestial object for space observation in the realm of complex spherical fuzzy systems.
Heliyon
July 2024
Department of Mathematics, Division of Science and Technology, University of Education, Lahore, 54770, Pakistan.
The sensible selection of celestial objects for observation by the James Web Space Telescope (JWST) is pivotal for the precise decision-making (DM) process, aligning with scientific priorities and instrument capabilities to maximize valuable data acquisition to address key astronomical questions within the constraints of limited observation time. Aggregation operators are valuable models for condensing and summarizing a finite set of data of imprecise nature. Utilization of these operators is critical when addressing multi-attribute decision-making (MCDM) challenges.
View Article and Find Full Text PDFAlignment of mosaic gratings is traditionally supported by two interferometric verifications: on the zero order to verify the grating surfaces and on the blaze to verify the groove direction. In the case of low frequency echelle grating an interferometric measurement on the zero order is hardly feasible due to extremely low contrast of the fringes. The complete alignment has then to be carried out on high order (close to the blaze) where the two misalignment errors (the tip and rotation) show the same effect on the interferogram.
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