Results 41 to 50 of about 49,023 (273)
Berichte zur Wissenschaftsgeschichte, EarlyView.Abstract Short‐lived, unobservable, and not subject to the usual rules of conservation of energy and momentum, virtual particles—an integral part of the conceptual framework of quantum field theory (QFT)—exhibit a number of curious characteristics which, in recent decades, have in part fueled important discussions about their ontological status ...
Jean‐Philippe Martinez
wiley +1 more source
Interactions between brown-dwarf binaries and Sun-like stars [PDF]
, 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. These statistics are limited by selection effects, but they are becoming increasingly discriminating.
arxiv +1 more source
Biological Diversity, EarlyView.Abstract The production of Carica papaya L. in Kenya is seriously affected by the Moroccan watermelon mosaic virus and lack of improved varieties leading to the importation of expensive seeds for the resource‐scarce farmers. To curb these challenges, new papaya hybrid lines were recently selected and bred, but their growth traits and performance ...
Janet Chepng’etich Kosgei +4 more
wiley +1 more source
SOLES XII. The Aligned Orbit of TOI-2533 b, a Transiting Brown Dwarf Orbiting an F8-type Star
The Astronomical JournalBrown dwarfs occupy a middle ground in mass space between gaseous giant planets and ultracool dwarf stars, and the characterisation of their orbital orientations may shed light on how these neighbouring objects form.
Thiago Ferreira dos Santos +3 more
doaj +1 more source
On the existence of brown dwarfs more massive than the hydrogen burning limit [PDF]
, 2018 Almost by definition brown dwarfs are objects with masses below the hydrogen burning limit, around $0.07\ M_\odot$. Below this mass, objects never reach a steady state where they can fuse hydrogen. Here we demonstrate, in contrast to this traditional view, that brown dwarfs with masses greater than the hydrogen burning limit may in principle exist in ...
arxiv +1 more source
Infrared Searches for Dark Matter in the Form of Brown Dwarfs [PDF]
Mon.Not.Roy.Astron.Soc.266:775,1994, 1993 Brown dwarfs, stars with insufficient mass to burn hydrogen, could contribute to the dark matter in the Galactic disk, galactic halos or even a background critical density. We consider the detectability of such brown dwarfs in various scenarios, extending previous work by allowing for the possibility that they may have an extended mass spectrum or be ...
arxiv +1 more source
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
Corporate Social Responsibility and Environmental Management, EarlyView.ABSTRACT Studies on the relationship between board diversity and CSR disclosure have shown mixed results. This study investigates the relationship between board diversity attributes and CSR disclosure, as well as the various cultural conditions influencing board diversity–CSR disclosure relationships through meta‐analysis based on data from 45 ...
Waris Ali +2 more
wiley +1 more source
The Astronomical Journal, 2023 We present three new brown dwarf spectral-binary candidates: CWISE J072708.09−360729.2, CWISE J103604.84−514424.4, and CWISE J134446.62−732053.9, discovered by citizen scientists through the Backyard Worlds: Planet 9 project.
Alexia Bravo +11 more
doaj +1 more source
Finding ultracool brown dwarfs with MegaCam on CFHT: method and first results [PDF]
, 2008 We present the first results of a wide field survey for cool brown dwarfs with the MegaCam camera on the CFHT telescope, the Canada-France Brown Dwarf Survey, hereafter CFBDS. Our objectives are to find ultracool brown dwarfs and to constrain the field-brown dwarf mass function thanks to a larger sample of L and T dwarfs. We identify candidates in CFHT/
arxiv +1 more source