Results 71 to 80 of about 1,398,905 (286)

Reweighting Scheme for the Calculation of Grand‐Canonical Expectation Values in Quantum Monte Carlo Simulations With a Fermion Sign Problem

Contributions to Plasma Physics, EarlyView.
ABSTRACT Ab initio path integral Monte Carlo (PIMC) simulations constitute the gold standard for the estimation of a broad range of equilibrium properties of a host of interacting quantum many‐body systems spanning a broad range of conditions from ultracold atoms to warm dense quantum plasmas.
Paul Hamann, Jan Vorberger, Tobias Dornheim   +2 more
wiley   +1 more source

On the Eccentricity Distribution and Tidal Evolution of Transiting Brown Dwarfs

The Astronomical Journal
Brown dwarfs on short-period orbits populate an intermediate regime between hot Jupiters and tight stellar binaries, lying at the intersection of possible evolutionary avenues.
Thiago Ferreira, Malena Rice
doaj   +1 more source

Brown dwarfs forming in discs: Where to look for them?

EPJ Web of Conferences, 2011
A large fraction of the observed brown dwarfs may form by gravitational fragmentation of unstable discs. This model reproduces the brown dwarf desert, and provides an explanation for the existence of planetary-mass objects and for the binary properties ...
Stamatellos D., Whitworth A.
doaj   +1 more source

Brown dwarfs as Galactic chronometers [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractBrown dwarfs are natural clocks, cooling and dimming over time due to insufficient core fusion. They are also numerous and present in nearly all Galactic environments, making them potentially useful chronometers for a variety of Galactic studies.
openaire   +2 more sources

Evidence of Free‐Bound Transitions in Warm Dense Matter and Their Impact on Equation‐of‐State Measurements

Contributions to Plasma Physics, EarlyView.
ABSTRACT Warm dense matter (WDM) is now routinely created and probed in laboratories around the world, providing unprecedented insights into conditions achieved in stellar atmospheres, planetary interiors, and inertial confinement fusion experiments.
M. P. Böhme, L. B. Fletcher, A. D. Baczewski, H. M. Bellenbaum, Z. A. Moldabekov, J. Vorberger, D. A. Chapman, M. J. MacDonald, S. Schwalbe, T. R. Preston, D. Kraus, T. Gawne, F. R. Graziani, S. Hamel, T. Döppner, T. Dornheim   +15 more
wiley   +1 more source

JADES: An Abundance of Ultradistant T and Y Dwarfs in Deep Extragalactic Data

The Astrophysical Journal
Ultracool T ( T _eff  ≈ 500–1200 K) and Y dwarfs ( T _eff ⪅ 500 K) have historically been found only a few hundred parsecs from the Sun. The sensitivity and wavelength coverage of the NIRCam instrument on board the James Webb Space Telescope offer a ...
Kevin N. Hainline, Jakob M. Helton, Brittany E. Miles, Jarron Leisenring, Mark S. Marley, Sagnick Mukherjee, Nicholas F. Wogan, Andrew J. Bunker, Benjamin D. Johnson, Roberto Maiolino, Marcia Rieke, Pierluigi Rinaldi, Brant Robertson, Fengwu Sun, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer   +16 more
doaj   +1 more source

Increase in plant productivity in the tundra in Sweden is not related to increasing presence of warm‐adapted vascular plant species

Ecography, EarlyView.
Over the past decades, Arctic and alpine biomes have warmed faster than the global average. Substantial vegetation changes have been reported as a response to this warming, including increased productivity and the spread of warm‐adapted (thermophilic) species that are less resistant to grazing pressure into higher latitudes and altitudes.
Tim Horstkotte, Jakob Assmann, Henrik Hedenås, Signe Normand, Johan Olofsson   +4 more
wiley   +1 more source

Diversity of Cold Worlds: A Near-complete Spectral Energy Distribution for 2MASS J04151954−0935066 Using JWST

The Astrophysical Journal
We present a near-complete spectral energy distribution (SED) for an extrasolar world: the T8 brown dwarf 2MASS J04151954−0935066. Spanning from optical to mid-infrared (0.7–20.4 μ m) wavelengths, the SED for this substellar atmosphere is constructed ...
Sherelyn Alejandro Merchan, Jacqueline K. Faherty, Genaro Suárez, Kelle L. Cruz, Adam J. Burgasser, Jonathan Gagné, Callie E. Hood, Eileen C. Gonzales, Daniella C. Bardalez Gagliuffi, Jolie L’Heureux, Johanna M. Vos, Adam C. Schneider, Aaron M. Meisner, Caroline Morley, J. Davy Kirkpatrick, Federico Marocco, Rocio Kiman, Charles A. Beichman, Ben Burningham, Dan Caselden, Peter R. Eisenhardt, Christopher R. Gelino, Ehsan Gharib-Nezhad, Marc J. Kuchner, Brianna Lacy, Austin Rothermich, Melanie J. Rowland, Niall Whiteford   +27 more
doaj   +1 more source

Phylogenetic structure of conifers in regional floras in relation to climate and environmental heterogeneity worldwide

Ecography, EarlyView.
Despite having only about 670 species worldwide, conifers are one of the ecologically and economically most important plant groups. They have a rich fossil record and previous studies have shown that their current diversity is the result of past radiations, extinction, and dispersal events, restricting many genera to either the Northern or Southern ...
Hong Qian, Michael Kessler, Shenhua Qian
wiley   +1 more source

Thermal niche breadth shapes regional elevational range sizes of tropical‐like mountain stream insects: evidence for Janzen's tropical mountain passes hypothesis

Ecography, EarlyView.
The core of Janzen's tropical mountain passes hypothesis is that relatively stable annual temperature variation limits species' thermal tolerances breadth, which, in combination with steep elevational temperature gradients, constrains the elevational distributions of these species. In addition to thermal niche breadth, elevational ranges were shaped by
Tingting Zhou, Ramiro Martín‐ Devasa, Xiaodan Chen, Haojie Wang, Yuxin Tan, Zhifa Liu, Bo‐Ping Han, Lu Wang, Zhenyuan Liu, Janne Soininen   +9 more
wiley   +1 more source