Results 11 to 20 of about 539 (174)

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.
europepmc   +2 more sources

The asteroseismology metacomputer [PDF]

Open Astronomy, 2000
Submitted to Baltic Astronomy, 5 pages, plain TeX, uses balticw ...
Metcalfe Τ. S., Nather R. E.
doaj   +3 more sources

A Novel Approach to Classify Telescopic Sensors Data Using Bidirectional-Gated Recurrent Neural Networks

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, Kashif Munir, Mubarak Almutairi, Faizan Younas, Mian Muhammad Sadiq Fareed, Gulnaz Ahmed   +5 more
doaj   +1 more source

The Pre-main Sequence: Challenges and Prospects for Asteroseismology

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
doaj   +1 more source

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, Teimuraz V. Zaqarashvili, Vasil Kukhianidze, Eka Gurgenashvili, Philippe Bourdin   +4 more
wiley   +1 more source

FRA–A new fast, robust, and automated pipeline for the detection and measurement of solar‐like oscillations in time‐series photometry of red‐giant stars

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, T. L. Campante, M. S. Cunha, F. Pereira   +3 more
wiley   +1 more source

On the application of machine learning in astronomy and astrophysics: A text‐mining‐based scientometric analysis

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, Ignacio Rodríguez‐Rodríguez, Wai Lok Woo   +2 more
wiley   +1 more source

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, Katja Poppenhäger, Julián D. Alvarado‐Gómez   +2 more
wiley   +1 more source

Asteroseismology and interferometry [PDF]

The Astronomy and Astrophysics Review, 2007
Asteroseismology provides us with a unique opportunity to improve our understanding of stellar structure and evolution. Recent developments, including the first systematic studies of solar-like pulsators, have boosted the impact of this field of research within Astrophysics and have led to a significant increase in the size of the research community ...
Cunha, M.S., Aerts, C., Christensen-Dalsgaard, J., Baglin, A., Bigot, Lionel, Brown, T.M., Catala, C., Creevey, O.L., Domiciano de Souza, A., Eggenberger, P., Garcia, P.J.V., Grundahl, F., Kervella, P., Kurtz, D.W., Mathias, P., Miglio, A., Monteiro, M.J.P.F.G., Perrin, G., Pijpers, F.P., Pourbaix, D., Quirrenbach, A., Rousselet-Perraut, K., Teixeira, T.C., Thévenin, F., Thompson, M.J.   +24 more
openaire   +7 more sources

Asteroseismology of High-Mass Stars: New Insights of Stellar Interiors With Space Telescopes

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
doaj   +1 more source