Results 21 to 30 of about 53,034 (302)

Interactions between brown-dwarf binaries and Sun-like stars

, 2012
Several mechanisms have been proposed for the formation of brown dwarfs, but there is as yet no consensus as to which -- if any -- are operative in nature. Any theory of brown dwarf formation must explain the observed statistics of brown dwarfs.
A. Natta, A. P. Whitworth, A. Toomre, A.J. Burgasser, A.J. Burgasser, A.J. Maury, A.P. Whitworth, A.P. Whitworth, A.P. Whitworth, B. Reipurth, C. McCarthy, C.F. Gammie, C.R. Gelino, D. Stamatellos, D. Stamatellos, D. Stamatellos, D. Stamatellos, D. Stamatellos, E. Moraux, E.T. Whelan, F. Comerón, H. Bouy, I. Thies, I. Thies, I.N. Reid, J. Sahlmann, J.K. Faherty, J.K. Faherty, K. Todorov, K.L. Luhman, K.L. Luhman, K.L. Luhman, L.M. Close, M. Ahmic, M. Kaplan, M.R. Bate, M.R. Bate, M.R. Bate, N. Lodieu, P. Girichidis, P. Hennebelle, P. Hennebelle, P. Padoan, R. Rebolo, S. Mohanty, S.K. Walch, S.P. Goodwin, S.P. Goodwin, S.S. Kumar, S.S.R. Offner, S.S.R. Offner, T. Nakajima   +51 more
core   +1 more source

Three New Cool Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer (WISE) and an Improved Spectrum of the Y0 Dwarf WISE J041022.71+150248.4 [PDF]

, 2014
As part of a larger search of Wide-field Infrared Survey Explorer (WISE) data for cool brown dwarfs with effective temperatures less than 1000 K, we present the discovery of three new cool brown dwarfs with spectral types later than T7.
Cushing, Michael C., Gelino, Christopher R., Gould, Andrew, Kirkpatrick, J. Davy, Mace, Gregory N., Skrutskie, Michael F.   +5 more
core   +3 more sources

Little Red Dots or Brown Dwarfs? NIRSpec Discovery of Three Distant Brown Dwarfs Masquerading as NIRCam-selected Highly Reddened Active Galactic Nuclei

The Astrophysical Journal Letters, 2023
Cold, substellar objects such as brown dwarfs have long been recognized as contaminants in color-selected samples of active galactic nuclei (AGNs). In particular, their near- to mid-infrared colors (1–5 μ m) can closely resemble the V-shaped ( f _λ ...
Danial Langeroodi, Jens Hjorth
doaj   +1 more source

Gravitational fragmentation and the formation of brown dwarfs in stellar clusters [PDF]

, 2008
We investigate the formation of brown dwarfs and very low-mass stars through the gravitational fragmentation of infalling gas into stellar clusters. The gravitational potential of a forming stellar cluster provides the focus that attracts gas from the ...
Bate, Bate, Bate, Bonnell, Bonnell, Bonnell, Bonnell, Bonnell, Bonnell, Bonnell, Burgasser, Clark, Clarke, Clarke, Elmegreen, Elmegreen, Goodwin, Ian A. Bonnell, Jappsen, Kitsionas, Kitsionas, Larson, Larson, Lubow, Luhman, Matthew R. Bate, Padoan, Padoan, Paul Clark, Reipurth, Scholz, Stamatellos, Whitworth, Whitworth, Whitworth   +34 more
core   +2 more sources

Pulsating young brown dwarfs [PDF]

, 2005
We present the results of a nonadiabatic, linear stability analysis of models of very low-mass stars (VLMSs) and brown dwarfs (BDs) during the deuterium burning phase in the center.
Angulo, Baraffe, Baraffe, Baraffe, Briceño, Béjar, Caughlan, Chabrier, Comerón, F. Palla, Gabriel, Gautschy, Hauschildt, I. Baraffe, Joergens, Lee, Linsky, Luhman, Marconi, Scholz, Stahler, Toma, Zapatero Osorio   +22 more
core   +1 more source

Predicting the Detection Yields of Giant Planets and Brown Dwarfs with CSST Astrometry

The Astronomical Journal
Chinese Space Station Telescope (CSST), which will begin its scientific operations around 2027, is going to survey the sky area of the median-to-high Galactic latitude and median-to-high ecliptic latitude.
Yifan Xuan, Fabo Feng, Zhensen Fu, Shilong Liao, Zhaoxiang Qi, Yang Chen   +5 more
doaj   +1 more source

Astrometry and Photometry for ≈1000 L, T, and Y Dwarfs from the UKIRT Hemisphere Survey

The Astronomical Journal, 2023
We present the positions, proper motions, and near-infrared photometry for 966 known objects with spectral types later than M that were observed as part of the the UKIRT Hemisphere Survey (UHS).
Adam C. Schneider, Jeffrey A. Munn, Frederick J. Vrba, Justice Bruursema, Scott E. Dahm, Stephen J. Williams, Michael C. Liu, Bryan N. Dorland   +7 more
doaj   +1 more source

The formation of brown dwarfs and low-mass stars by disc fragmentation

, 2008
We suggest that a high proportion of brown dwarfs are formed by gravitational fragmentation of massive, extended discs around Sun-like stars. We argue that such discs should arise frequently, but should be observed infrequently, precisely because they ...
Anthony P. Whitworth, Dimitris Stamatellos, Eric Stempels   +2 more
core   +1 more source

Genome‐Wide Association Analyses Reveal the Genetic Basis of EMS Mutagenesis Efficiency in Rice

Advanced Science, EarlyView.
Based on large‐scale screening of 420 rice accessions, GWAS identified the Rc locus as a key regulator of EMS mutagenesis efficiency. Functional Rc alleles enhance both seed survival and genome‐wide mutation frequency by boosting antioxidant enzyme activities (CAT, SOD, POD) and reducing oxidative damage.
Peizhou Xu, Qinglu Zhang, Le Xue, Zhen Zhang, Nanhui Luo, Zhaoyang Cheng, Duo Xia, Shuqin Zheng, Xianjun Wu, Hao Zhou   +9 more
wiley   +1 more source

Gut Microbe‐Driven Resistance Mechanisms in Propylea Japonica: Insights from Horizontal Gene Transfer and Oxidative Phosphorylation

Advanced Science, EarlyView.
Acinetobacter regulates dinotefuran tolerance in Propylea japonica by mediating the expression of the horizontally transferred gene PjDUF1. Abstract Insect–microbial symbiont relationships are widespread in nature and often involve lateral gene transfer.
Ningbo HuangFu, Xiangzhen Zhu, Zhijuan Tang, Li Wang, Kaixin Zhang, Dongyang Li, Jichao Ji, Jinjie Cui, Zhaojiang Guo, Junyu Luo, Xueke Gao   +10 more
wiley   +1 more source