Results 1 to 10 of about 106,175 (180)

Spectroscopy of Brown Dwarf Candidates in the rho Ophiuchi Molecular Core [PDF]

, 1998
We present an analysis of low resolution infrared spectra for 20 brown dwarf candidates in the core of the $\rho$ Ophiuchi molecular cloud. Fifteen of the sources display absorption-line spectra characteristic of late-type stars.
Briceno C., Bruce A. Wilking, Calvet N., Casoli M., Comeron F., D'Antona F., Dent W. R. F., Hartmann L., Jones H. R. A., Kenyon S. J., Lynden-Bell D., Michael R. Meyer, Perrin G., Schiavon R. P., Thomas P. Greene   +14 more
core   +3 more sources

Substellar Companions to Main Sequence Stars: No Brown Dwarf Desert at Wide Separations [PDF]

, 2001
We use three field L and T dwarfs which were discovered to be wide companions to known stars by the Two Micron All-Sky Survey (2MASS) to derive a preliminary brown dwarf companion frequency.
Adam Burgasser, Bouvier J., David G. Monet, Duquennoy A., Goldman B., Halbwachs J. L., I. Neill Reid, J. Davy Kirkpatrick, James Liebert, John C. Wilson, John E. Gizis   +10 more
core   +3 more sources

Exploring Brown Dwarf Disks [PDF]

, 2001
We discuss the spectral energy distribution of three very low mass objects in Chamaeleon I for which ground-based spectroscopy and photometry as well as ISO measurements in the mid-infrared are available (Comeron et al. 2000; Persi et al. 2000).
A. Natta, Allard, Baraffe, Basri, Beckwith, Chiang, Chiang, Comerón, Comerón, Henning, Kenyon, L. Testi, Leggett, Lucas, Muzerolle, Natta, Natta, Neuhäuser, Oasa, Persi, Pickett, Reipurth, Waelkens, Zapatero Osorio   +23 more
core   +4 more sources

Hotter than Expected: Hubble Space Telescope (HST)/WFC3 Phase-resolved Spectroscopy of a Rare Irradiated Brown Dwarf with Strong Internal Heat Flux

The Astrophysical Journal, 2023
With infrared flux contrasts larger than typically seen in hot Jupiter, tidally locked white dwarf–brown dwarf binaries offer a superior opportunity to investigate atmospheric processes in irradiated atmospheres. NLTT5306 is such a system, with a M _BD =
Rachael C. Amaro, Dániel Apai, Yifan Zhou, Ben W. P. Lew, Sarah L. Casewell, L. C. Mayorga, Mark S. Marley, Xianyu Tan, Joshua D. Lothringer, Vivien Parmentier, Travis Barman   +10 more
doaj   +1 more source

Keragaan vegetatif dan generatif pada fase pembungaan awal kelapa Genjah kopyor asal kultur embrio di Bogor, Jawa Barat

Menara Perkebunan, 2022
The performance of kopyor Dwarf coconuts from embryo culture in the field has not been reported. This study was conducted to determine the difference in vegetative and generative performances of three fruit color phenotypes (brown, green, and yellow) of ...
M. Eko Riyo Bayu Prasetyo, Imron Riyadi, Sumaryono   +2 more
doaj   +1 more source

Intercomparison of Brown Dwarf Model Grids and Atmospheric Retrieval Using Machine Learning

The Astrophysical Journal, 2023
Understanding differences between substellar spectral data and models has proven to be a major challenge, especially for self-consistent model grids that are necessary for a thorough investigation of brown dwarf atmospheres.
Anna Lueber, Daniel Kitzmann, Chloe E. Fisher, Brendan P. Bowler, Adam J. Burgasser, Mark Marley, Kevin Heng   +6 more
doaj   +1 more source

The Galactic disk mass-budget : II. Brown dwarf mass-function and density [PDF]

, 2001
In this paper, we extend the calculations conducted previously in the stellar regime to determine the brown dwarf IMF in the Galactic disk. We perform Monte Carlo calculations taking into account the brown dwarf formation rate, spatial distribution and ...
Chabrier G., Cuby J. G., Duquennoy A., Gilles Chabrier, Halbwachs J. L., Haywood M., Scalo J. M.   +6 more
core   +2 more sources

Search for brown-dwarf companions of stars [PDF]

, 2010
The discovery of 9 new brown-dwarf candidates orbiting stars in the CORALIE and HARPS radial-velocity surveys is reported. New CORALIE radial velocities yielding accurate orbits of 6 previously-known hosts of potential brown-dwarf companions are ...
Baranne, Bean, Benedict, Bouchy, Bouchy, Burrows, Butler, Casertano, Chabrier, Correia, D. Naef, D. Queloz, D. Ségransan, da Silva, Deleuil, Delfosse, Duquennoy, Endl, F. Pepe, Fischer, Forveille, Galland, Girardi, Goldin, Grether, Halbwachs, Halbwachs, Han, Hatzes, Hummel, J. Sahlmann, Jenkins, Konacki, Lane, Liu, Luhman, M. Marmier, M. Mayor, Marcy, Marcy, Martioli, Mayor, Mayor, Mayor, Minniti, Moutou, Muterspaugh, N. C. Santos, Naef, Naef, Nidever, Omiya, Patel, Pepe, Perrier, Perryman, Perryman, Pourbaix, Pourbaix, Pourbaix, Pourbaix, Queloz, Reffert, S. Udry, S. Zucker, Santos, Santos, Santos, Santos, Santos, Santos, Sousa, Sozzetti, Ségransan, Tamuz, Tinney, Tokovinin, Torres, Udry, Udry, Udry, van Leeuwen, Wittenmyer, Wright, Zucker, Zucker   +85 more
core   +1 more source

Brown Dwarf Retrievals on FIRE!: Atmospheric Constraints and Lessons Learned from High Signal-to-noise Medium-resolution Spectroscopy of a T9 Dwarf

The Astrophysical Journal, 2023
Brown dwarf spectra offer vital testbeds for our understanding of the chemical and physical processes that sculpt substellar atmospheres. Recently, atmospheric retrieval approaches have been successfully applied to low-resolution ( R ∼ 100) spectra of L,
Callie E. Hood, Jonathan J. Fortney, Michael R. Line, Jacqueline K. Faherty   +3 more
doaj   +1 more source

Correlation and Path Coefficient Analysis of Kopyor Dwarf Coconut (Cocos nucifera L.)

CORD, 2017
Breeding programs of kopyor dwarf coconut require a population base with high genetic diversity especially for characters that relate to fruit production.
Miftahorrachman, Sukmawati Mawardi, Hengky Novarianto3   +2 more
doaj   +1 more source