Results 51 to 60 of about 49,023 (273)

The brown dwarf desert as a consequence of orbital migration [PDF]

Mon.Not.Roy.Astron.Soc. 330 (2002) L11, 2001
We show that the dearth of brown dwarfs in short-period orbits around Solar-mass stars - the brown dwarf desert - can be understood as a consequence of inward migration within an evolving protoplanetary disc. Brown dwarf secondaries forming at the same time as the primary star have masses which are comparable to the initial mass of the protoplanetary ...
arxiv   +1 more source

An Early Pleistocene interglacial deposit at Pingorsuit, North‐West Greenland

Boreas, Volume 52, Issue 1, Page 27-41, January 2023., 2023
At the Pingorsuit Glacier in North‐West Greenland, an organic‐rich deposit that had recently emerged from the retreating ice cap was discovered at an elevation of 480 m above sea level. This paper reports on macrofossil analyses of a coarse detritus gyttja and peaty soil, which occurred beneath a thin cover of till and glacifluvial deposits.
Ole Bennike, William Colgan, Lars Hedenäs, Oliver Heiri, Geoffrey Lemdahl, Peter Wiberg‐Larsen, Sofia Ribeiro, Roberto Pronzato, Renata Manconi, Anders A. Bjørk   +9 more
wiley   +1 more source

HCN and C2H2 in the Atmosphere of a T8.5+T9 Brown Dwarf Binary

The Astrophysical Journal Letters
T-type brown dwarfs present an opportunity to explore atmospheres teeming with molecules such as H _2 O, CH _4 , and NH _3 , which exhibit a wealth of absorption features in the mid-infrared.
Elisabeth C. Matthews, Paul Mollière, Helena Kühnle, Polychronis Patapis, Niall Whiteford, Matthias Samland, Pierre-Olivier Lagage, Rens Waters, Shang-Min Tsai, Kevin Zahnle, Manuel Guedel, Thomas Henning, Bart Vandenbussche, Olivier Absil, Ioannis Argyriou, David Barrado, Alain Coulais, Adrian M. Glauser, Goran Olofsson, John P. Pye, Daniel Rouan, Pierre Royer, Ewine F. van Dishoeck, T. P. Ray, Göran Östlin   +24 more
doaj   +1 more source

BROWN DWARFS: MYSTERY AND SHOW

Odessa Astronomical Publications, 2017
Results of the numerical simulation of the spectrum of the brown dwarf candidate Teide 1 discovered by Rebolo et al. (1995) are discussed.
Ya. V. Pavlenko
doaj   +1 more source

The Formation Mechanism of Brown Dwarfs [PDF]

Mon.Not.Roy.Astron.Soc. 332 (2002) L65, 2002
We present results from the first hydrodynamical star formation calculation to demonstrate that brown dwarfs are a natural and frequent product of the collapse and fragmentation of a turbulent molecular cloud. The brown dwarfs form via the fragmentation of dense molecular gas in unstable multiple systems and are ejected from the dense gas before they ...
arxiv   +1 more source

SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B

The Astrophysical Journal
Brown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models.
Briley L. Lewis, Yiting Li, Aidan Gibbs, Michael P. Fitzgerald, Timothy Brandt, Daniella Bardalez Gagliuffi, Qier An, Minghan Chen, Rachel Bowens-Rubin, Maïssa Salama, Julien Lozi, Rebecca Jensen-Clem, Ben Mazin   +12 more
doaj   +1 more source

The prospects for finding brown dwarfs in eclipsing binary systems and measuring brown dwarf properties [PDF]

, 2004
We present the results of a simulation to investigate the prospects of measuring mass, age, radius, metallicity and luminosity data for brown dwarfs in fully eclipsing binary systems around late K and early M dwarfs identified by ultra-wide-field transit surveys. These surveys will monitor approximately a million K and M dwarfs at a level sufficient to
arxiv   +1 more source

The Structure of Brown Dwarf Circumstellar Disks [PDF]

Mon.Not.Roy.Astron.Soc.351:607,2004, 2004
We present synthetic spectra for circumstellar disks that are heated by radiation from a central brown dwarf. Under the assumption of vertical hydrostatic equilibrium, our models yield scaleheights for brown dwarf disks in excess of three times those derived for classical T Tauri (CTTS) disks.
arxiv   +1 more source

When Neurodiversity and Ethnicity Combine: Intersectional Stereotyping and Workplace Experiences of Neurodivergent Ethnic Minority Employees

Human Resource Management, EarlyView.
ABSTRACT This study investigates the workplace experiences of 51 ethnic minority professionals who self‐identify as neurodivergent, focusing specifically on the impact of intersectional stereotyping within organizations in the United Kingdom and United States.
Debora Gottardello, Thomas Calvard, Ji‐Won Song   +2 more
wiley   +1 more source

Geo‐scripts and refugee resettlement in Canada: Designations and destinations

Canadian Geographies / Géographies canadiennes, Volume 66, Issue 4, Page 653-668, Winter / hiver 2022., 2022
Key Messages Geo‐scripts are the locational instructions embedded in one's category of refugee resettlement; they shape the places newcomers land, just as these communities influence their lives and livelihoods. Former refugees' decisions to stay put or move elsewhere once in Canada are related to services, affordable housing, education, and job ...
Jennifer Hyndman
wiley   +1 more source