Results 81 to 90 of about 5,171 (308)

Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity

EPJ Web of Conferences, 2011
We use Spitzer IRAC 3.6–8.0 μm photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs with effective temperature (Teff)50% of their
Pinfield D.J., Jones H.R.A., Warren S.J., Marley M.S., Saumon D., Burningham B., Leggett S.K., Smart R.L.   +7 more
doaj   +1 more source

Young Brown Dwarfs in Orion

, 2007
We have obtained optical spectra of 60 low-mass stars and brown dwarfs in Orion’s Trapezium cluster. Spectral types have been determined using a combination of narrowband indices derived from the spectra. 1. Observations Multi-object optical spectroscopy in the red region was carried out using TAURUS on the AAT and GMOS on Gemini-N on objects selected ...
Riddick, F, Roche, P, Lucas, P
openaire   +2 more sources

Evolution and Phylogenetics of the Javan Hawk‐Eagle Nisaetus bartelsi (Stresemann, 1924) Using Mitochondrial Data 爪哇鹰雕 Nisaetus bartelsi (Stresemann, 1924) 基于线粒体数据的演化与系统发育研究

Integrative Conservation, EarlyView.
This study reconstructs the phylogeny of the Javan Hawk‐Eagle (Nisaetus bartelsi) within the subfamily Aquilinae using Maximum Likelihood and Bayesian Inference algorithms on a blood sample and GenBank data. The analysis reveals that the sampled genus Nisaetus forms a monophyletic group. Furthermore, N. bartelsi occupies a sister‐taxon of N.
Almas Lathifatul Ula, Tuty Arisuryanti, Rury Eprilurahman, Dwi Sendi Priyono   +3 more
wiley   +1 more source

DEPLETION OF TiO AND SPECTRA OF THE COOLEST BROWN DWARFS

Odessa Astronomical Publications, 2017
This study was performed in the context of the ”lithium test” for brown dwarfs proposed by Rebolo et al. (1992). We consider the formation of lithium dust species in atmospheres of the coolest stars and substellar objects.
Ya. V. Pavlenko
doaj   +1 more source

Brown Dwarf Companions to Solar-Type Stars and other Brown Dwarfs [PDF]

Symposium - International Astronomical Union, 2004
We report on our ongoing imaging efforts to detect brown dwarfs orbiting solar-type stars and other brown dwarfs. We study the properties of brown dwarf companions as a function of primary mass. Our results indicate that the frequency of brown dwarf companions around solar-type stars for separations larger than about 40 AU is non-negligible.
Eduardo L. Martín, Mike Connelley, Dan Potter, Hervé Bouy   +3 more
openaire   +1 more source

Impulse Buying in Live Streaming: Value Determinants and Self‐Control

Global Business and Organizational Excellence, EarlyView.
ABSTRACT Although e‐commerce is still in its early stages of development in developing regions, the growing economy and improving digital infrastructure have created favorable conditions for positioning a country as an emerging digital commerce hub, attracting both consumers and businesses seeking new opportunities.
Ing Grace Phang, Juan Kweng Low, Zaiton Osman, Tze‐Yin Lim   +3 more
wiley   +1 more source

The only inflated brown dwarf in an eclipsing white dwarf–brown dwarf binary: WD1032+011B

Monthly Notices of the Royal Astronomical Society
ABSTRACT Due to their short orbital periods and relatively high-flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ratios. WD1032+011 is an eclipsing, tidally locked white dwarf–brown dwarf binary with a 9950 
French, J.R., Casewell, S.L., Amaro, R.C., Lothringer, J.D., Mayorga, L.C., Littlefair, S.P., Lew, B.W.P., Zhou, Y., Apai, D., Marley, M.S., Parmentier, V., Tan, X.   +11 more
openaire   +3 more sources

Africa's Biodiversity Will Not Be Saved by Protected Areas Alone

Biological Diversity, EarlyView.
Luca Luiselli
wiley   +1 more source

Humanism in the Age of Hyperreality: A Speculative Critique of AI Therapybots and the Neoliberal Commodification of Human Beings

The Journal of Humanistic Counseling, EarlyView.
ABSTRACT This article examines the future place of humanistic counseling, assuming the successful mass deployment of artificial intelligence therapy chatbots (AITCs). We systematically identify the limitations of AITCs through the lens of Jean Baudrillard's view on simulacra and hyperreality and identify five collective psychosocial consequences of ...
Brett. D. Wilkinson, Andrew M. Brown
wiley   +1 more source

Chemistry and Isotope Ratios of Substellar Atmospheres in the β Pictoris Young Moving Group and Vicinity

The Astrophysical Journal
Measuring the chemical and isotopic compositions of gas giants and brown dwarfs provides insights into their formation pathways and birth environments. 2MASS J0249-0557c is an L2-type planetary mass companion (∼12 M _Jup ) orbiting a pair of brown dwarfs
Yurou Liu, Yapeng Zhang, Jerry W. Xuan, Dimitri Mawet, Ignas Snellen, Rico Landman, Tomas Stolker, Sam de Regt, Aurora Kesseli, Malena Rice   +9 more
doaj   +1 more source