Results 21 to 30 of about 92,482 (301)

A Grid of 3D Stellar Atmosphere Models of Solar Metallicity: I. General Properties, Granulation and Atmospheric Expansion

, 2013
Present grids of stellar atmosphere models are the workhorses in interpreting stellar observations, and determining their fundamental parameters. These models rely on greatly simplified models of convection, however, lending less predictive power to such
Asplund, Martin, Collet, Remo, Nordlund, Åke, Stein, Robert F., Trampedach, Regner   +4 more
core   +1 more source

Effect of stellar wind induced magnetic fields on planetary obstacles of non-magnetized hot Jupiters [PDF]

, 2017
We investigate the interaction between the magnetized stellar wind plasma and the partially ionized hydrodynamic hydrogen outflow from the escaping upper atmosphere of non- or weakly magnetized hot Jupiters. We use the well-studied hot Jupiter HD 209458b
Erkaev, N. V., Fossati, L., Johnstone, C. P., Khodachenko, M. L., Kislyakova, K. G., Kubyshkina, D. I., Lammer, H., Mezentsev, A. V., Odert, P., Shaikhislamov, I. F.   +9 more
core   +2 more sources

A Unified Computational Model for Solar and Stellar Flares

, 2015
We present a unified computational framework which can be used to describe impulsive flares on the Sun and on dMe stars. The models assume that the flare impulsive phase is caused by a beam of charged particles that is accelerated in the corona and ...
Allred, Joel C., Carlsson, Mats, Kowalski, Adam F.   +2 more
core   +1 more source

The stellar atmosphere simulation code Bifrost

, 2011
Context: Numerical simulations of stellar convection and photospheres have been developed to the point where detailed shapes of observed spectral lines can be explained.
Abbett, Arber, Arnaud, B. V. Gudiksen, Carlsson, Carlsson, Carlsson, Carlsson, Cheung, De Pontieu, DeVore, Dorfi, Galsgaard, Gudiksen, Gustafsson, Hansteen, Hansteen, Hansteen, Hayek, Heggland, Heinemann, Isobe, J. Leenaarts, J. Martínez-Sykora, Keller, Leenaarts, Leenaarts, M. Carlsson, Martínez-Sykora, Martínez-Sykora, Martínez-Sykora, Nordlund, Orszag, Rempel, Ryu, Shull, Skartlien, Sod, Stein, Thompson, Tortosa-Andreu, Trujillo Bueno, Tsuji, Tóth, V. H. Hansteen, Vernazza, Vögler, W. Hayek, Wedemeyer-Böhm, Woodall   +49 more
core   +1 more source

The Inhomogeneity Effect. I. Inhomogeneous Surface and Atmosphere Accelerate Planetary Cooling

The Astrophysical Journal, 2023
We propose a general principle that under radiative-convective equilibrium, the spatial and temporal variations in a planet’s surface and atmosphere tend to increase its cooling.
Xi Zhang
doaj   +1 more source

The effect of the stellar absorption line centre-to-limb variation on exoplanet transmission spectrum observations

, 2017
Transit spectroscopy is one of the most commonly used techniques for exoplanet atmosphere characterisation. This technique has been used to detect ionized and neutral species in exoplanet atmospheres by comparing the observed stellar lines in and out of ...
Fosbury, Robert A. E., Henning, Thomas, Pallé, Enric, Petr-Gotzens, Monika G., Yan, Fei   +4 more
core   +1 more source

Radial modes of levitating atmospheres around Eddington-luminosity neutron stars [PDF]

, 2017
We consider an optically thin radiation-supported levitating atmosphere suspended well above the stellar surface, as discussed recently in the Schwarzschild metric for a star of luminosity close to the Eddington value.
Bollimpalli, Deepika Ananda, Kluźniak, Włodek   +1 more
core   +1 more source

Phosphatidylinositol 4‐kinase as a target of pathogens—friend or foe?

FEBS Letters, EarlyView.
This graphical summary illustrates the roles of phosphatidylinositol 4‐kinases (PI4Ks). PI4Ks regulate key cellular processes and can be hijacked by pathogens, such as viruses, bacteria and parasites, to support their intracellular replication. Their dual role as essential host enzymes and pathogen cofactors makes them promising drug targets.
Ana C. Mendes, Guilherme M. Azevedo, Amanda P. Barcellos, Diana Bahia   +3 more
wiley   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

Sequence determinants of RNA G‐quadruplex unfolding by Arg‐rich regions

FEBS Letters, EarlyView.
We show that Arg‐rich peptides selectively unfold RNA G‐quadruplexes, but not RNA stem‐loops or DNA/RNA duplexes. This length‐dependent activity is inhibited by acidic residues and is conserved among SR and SR‐related proteins (SRSF1, SRSF3, SRSF9, U1‐70K, and U2AF1).
Naiduwadura Ivon Upekala De Silva, Puspa Kunwar, Md Ibnul Rifat Rahman, Joanna Koryo Kwao, Nathan Lehman, Zihan Zhang, Trenton Paul, Claire Cheng, Nicholas Truex, Hui‐Ting Lee, Jun Zhang   +10 more
wiley   +1 more source