Results 71 to 80 of about 83,891 (346)

Spatially Resolved Mapping of Voltage‐Gated Proton Channel Activity Reveals Delayed Proton Transport in Local Microenvironments

Advanced Science, EarlyView.
A revolutionary imaging platform integrating quantitative single‐molecule photobleaching with ratiometric fluorescence probes enables high‐throughput (≈2300 individually resolvable channels) mapping of individual proton channels in a large field (≈3000 µm2), overcoming the spatial and temporal limitations of conventional electrophysiology.
Jiahua Zhuang, Yang Xu, Yuxian Lu, Shiyang Lyu, Jie Tan, Jiandong Feng   +5 more
wiley   +1 more source

The Origins of Lithium Enhancement in Polluted White Dwarfs

The Astrophysical Journal
The bulk abundances of exoplanetesimals can be measured when they are accreted by white dwarfs. Recently, lithium from the accretion of exoplanetesimals was detected in relatively high levels in multiple white dwarfs.
Benjamin C. Kaiser, J. Christopher Clemens, Simon Blouin, Erik Dennihy, Patrick Dufour, Ryan J. Hegedus, Joshua S. Reding   +6 more
doaj   +1 more source

Spectroscopic confirmation of UV-bright white dwarfs from the Sandage Two-Color Survey of the Galactic Plane

, 2011
We present spectroscopic observations confirming the identification of hot white dwarfs among UV-bright sources from the Sandage Two-color Survey of the Galactic plane and listed in the Lanning (Lan) catalog of such sources.
Beauchamp, Beauchamp, Bovy, de Zeeuw, Eisenstein, Gates, Holberg, Howard H. Lanning, Kawka, Kilic, Kilkenny, Luyten, Luyten, Lépine, Lépine, Lépine, Lépine, McCook, Moehler, Monet, P. Bergeron, Ruiz, Subasavage, Sébastien Lépine, Tremblay, Tremblay, Vennes, Walker, Wood   +28 more
core   +1 more source

IRTF Observations of White Dwarfs with Possible Near-Infrared Excess [PDF]

, 2009
Near-infrared photometry and spectroscopy is obtained for a heterogeneous sample of nearby white dwarfs with possible excess flux as identified primarily in the Two Micron All Sky Survey. Among the sample of 43 stars are a number of white dwarfs that are
Adelman-McCarthy, Beauchamp, Becklin, Bergeron, Bergeron, Bergeron, Bergeron, Bergeron, Bergeron, Bergeron, Bochanski, Burleigh, Burleigh, Carpenter, Catalán, Copenhagen University Observatory, Cushing, DENIS Consortium, Dobbie, Downes, Dreizler, Dufour, Dupuis, Eggen, Eggen, Eisenstein, Farihi, Farihi, Farihi, Farihi, Farihi, Green, Green, Greenstein, Greenstein, Hagen, Holberg, Homeier, J. Farihi, Jordan, Jura, Jura, Kalirai, Kawka, Kilic, Kilic, Kilkenny, Kirkpatrick, Kleinman, Koester, Koester, Koester, Koester, Liebert, Liebert, Liebert, Liebert, Liebert, Lisker, Massey, McCook, McCook, Monet, Morales-Rueda, Napiwotzki, Nelemans, Pauli, Probst, Putney, Raymond, Rayner, Rebassa-Mansergas, Reid, Salim, Schmidt, Schmidt, Schmidt, Silvestri, Sion, Skrutskie, Steele, van Altena, Vennes, von Hippel, Voss, Wachter, Wellhouse, Williams, Wolff, Zacharias, Zacharias, Zuckerman, Zuckerman, Zuckerman   +93 more
core   +2 more sources

White Dwarf Cooling Curves and Searches For White Dwarfs [PDF]

Highlights of Astronomy, 1998
White dwarf (WD) evolution is essentially a cooling problem in two parts. Degenerate electrons in the core provide the support while non-degenerate C and O ions provide the thermal reservoir (Koester & Chanmugam 1990, Kawaler 1996). The rate of energy loss through the non-degenerate envelope of H and He—segregated by gravitational settling—is ...
openaire   +2 more sources

SpaBalance: Balanced Learning for Efficient Spatial Multi‐Omics Decoding

Advanced Science, EarlyView.
SpaBalance is a computational framework that harmonizes multi‐omics learning via gradient equilibrium and dual‐stream feature decomposition, achieving superior clustering accuracy, biological interpretability, and scalable integration of three or more spatial omics modalities.
Yingbo Cui, Yong Zhao, Canqun Yang, Tao Tang, Xiangke Liao, Hongyu Zhang, Huiying Zhao, Zheng Wang, Yuansong Zeng   +8 more
wiley   +1 more source

Do White Dwarfs Sample Water-rich Planetary Material?

The Astrophysical Journal
Polluted white dwarfs offer a unique way to directly probe the compositions of exoplanetary bodies. We examine the water content of accreted material using the oxygen abundances of 51 highly polluted white dwarfs.
Isabella L. Trierweiler, Carl Melis, Érika Le Bourdais, Patrick Dufour, Alycia J. Weinberger, Boris T. Gänsicke, Nicola Gentile-Fusillo, Siyi Xu, Jay Farihi, Andrew Swan, Malena Rice, Edward D. Young   +11 more
doaj   +1 more source

Massive white dwarfs in $$f(\mathtt {R,L_m})$$ f ( R , L m ) gravity

European Physical Journal C: Particles and Fields, 2022
In this work, we investigate the equilibrium configurations of massive white dwarfs (MWD) in the context of modified gravity, namely $$f(\mathtt {R,L_m})$$ f ( R , L m ) gravity, where $$\mathtt {R}$$ R stands for the Ricci scalar and $$\mathtt {L_m}$$ L
R. V. Lobato, G. A. Carvalho, N. G. Kelkar, M. Nowakowski   +3 more
doaj   +1 more source

The seismic properties of low-mass He-core white dwarf stars [PDF]

, 2012
We present here a detailed pulsational study applied to low-mass He-core white dwarfs, based on full evolutionary models representative of these objects.
Althaus, L. G., Córsico, A. H., Hermes, J. J., Romero, A. D.   +3 more
core   +4 more sources

An irradiated brown-dwarf companion to an accreting white dwarf [PDF]

Nature, 2016
Brown dwarfs and giant planets orbiting close to a host star are subjected to significant irradiation that can modify the properties of their atmospheres. In order to test the atmospheric models that are used to describe these systems, it is necessary to obtain accurate observational estimates of their physical properties (masses, radii, temperatures ...
S. P. Littlefair, M. L. Pretorius, Juan V. Hernández Santisteban, V. S. Dhillon, Rene P. Breton, Rene P. Breton, Boris T. Gänsicke, John Southworth, Christian Knigge, Tom Marsh, Peter H. Hauschildt   +10 more
openaire   +9 more sources