Results 1 to 10 of about 6,468 (258)
The Nature and Origins of Sub-Neptune Size Planets. [PDF]
J Geophys Res Planets, 2021 Abstract Planets intermediate in size between the Earth and Neptune, and orbiting closer to their host stars than Mercury does the Sun, are the most common type of planet revealed by exoplanet surveys over the last quarter century. Results from NASA's Kepler mission have revealed a bimodality in the radius distribution of these objects, with a relative
Bean JL, Raymond SN, Owen JE.
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The Pre-main Sequence: Challenges and Prospects for Asteroseismology [PDF]
Frontiers in Astronomy and Space Sciences, 2022 Stars do not simply pop up on the main sequence. Before the stars arrive on the zero-age main sequence, they form in the collapses of molecular clouds, gain matter through accretion processes, and compress their cores until hydrogen can burn in full ...
Konstanze Zwintz, Thomas Steindl
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Asteroseismology of High-Mass Stars: New Insights of Stellar Interiors With Space Telescopes [PDF]
Frontiers in Astronomy and Space Sciences, 2020 Massive stars are important metal factories in the Universe. They have short and energetic lives, and many of them inevitably explode as a supernova and become a neutron star or black hole.
Dominic M. Bowman
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Applied Sciences, 2022 Asteroseismology studies the physical structure of stars by analyzing their solar-type oscillations as seismic waves and frequency spectra. The physical processes in stars and oscillations are similar to the Sun, which is more evolved to the red-giant ...
Ali Raza +5 more
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Equatorially trapped Rossby waves in radiative stars
Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023 Abstract Observations by recent space missions reported the detection of Rossby waves (r‐modes) in light curves of many stars (mostly A, B, and F spectral types) with outer radiative envelope. This article aims to study the theoretical dynamics of Rossby‐type waves in such stars. Hydrodynamic equations in a rotating frame were split into horizontal and
Mariam Albekioni +4 more
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Astronomische Nachrichten, Volume 344, Issue 5, June 2023., 2023 Abstract We developed, tested, and validated a new Fast, Robust, and Automated (FRA) tool to detect solar‐like oscillations. FRA is based on the detection and measurement of the frequency of maximum oscillation power νmax$$ {\nu}_{\mathrm{max}} $$, without relying on the detection of a regular frequency spacing to guide the search.
Charlotte Gehan +3 more
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WIREs Data Mining and Knowledge Discovery, Volume 12, Issue 5, September/October 2022., 2022 This work presents a text‐mining‐based scientometric analysis of the scientific output in the last three decades regarding the use of artificial intelligence and machine learning in the fields of astronomy and astrophysics. Abstract Since the beginning of the 21st century, the fields of astronomy and astrophysics have experienced significant growth at ...
José‐Víctor Rodríguez +2 more
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Localizing flares to understand stellar magnetic fields and space weather in exo‐systems
Astronomische Nachrichten, Volume 343, Issue 4, May 2022., 2022 Abstract Stars are uniform spheres, but only to first order. The way in which stellar rotation and magnetism break this symmetry places important observational constraints on stellar magnetic fields, and factors in the assessment of the impact of stellar activity on exoplanet atmospheres.
Ekaterina Ilin +2 more
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Highlights of Discoveries for δ Scuti Variable Stars From the Kepler Era
Frontiers in Astronomy and Space Sciences, 2021 The NASA Kepler and follow-on K2 mission (2009–2018) left a legacy of data and discoveries, finding thousands of exoplanets, and also obtaining high-precision long time-series data for hundreds of thousands of stars, including many types of pulsating ...
Joyce Ann Guzik
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Detection and Optimization of Traffic Networks Based on Voronoi Diagram
Discrete Dynamics in Nature and Society, Volume 2021, Issue 1, 2021., 2021 Traffic peak is an important parameter of modern transport systems. It can be used to calculate the indices of road congestion, which has become a common problem worldwide. With accurate information about traffic peaks, transportation administrators can make better decisions to optimize the traffic networks and therefore enhance the performance of ...
Rui Tao +6 more
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