Results 121 to 130 of about 22,040,331 (192)

Benchmark Brown Dwarf Systems. I. Chemical Abundance Analysis of FGK Stars with Wide-separation Brown Dwarf Companions Using PEPSI

The Astrophysical Journal
We present results from a spectroscopic survey of 32 FGK stars hosting brown dwarfs, using high-resolution optical spectra ( R = 130,000 and 50,000) obtained with the Potsdam Echelle Polarimetric and Spectroscopic Instrument spectrograph on the Large ...
Caprice L. Phillips, Megan Bedell, Catherine Manea, Alison Duck, Anusha Pai Asnodkar, Emily J. Griffith, Austin Rothermich, Emily Calamari, Jacqueline K. Faherty, Ben Burningham, Channon Visscher, Eileen C. Gonzales, Ilya Ilyin, Klaus Strassmeier, Ji Wang   +14 more
doaj   +1 more source

Euclid Quick Data Release (Q1)—Spectroscopic Search, Classification, and Analysis of Ultracool Dwarfs in the Deep Fields

The Astrophysical Journal
The Near-Infrared Spectrometer and Photometer on board the Euclid space mission has obtained near-infrared (NIR) slitless spectra of millions of objects, including hundreds of ultracool dwarfs (UCDs).
C. Dominguez-Tagle, M. Žerjal, N. Sedighi, P. Mas-Buitrago, E. L. Martin, J.-Y. Zhang, N. Vitas, V. J. S. Béjar, S. Tsilia, S. Muñoz Torres, N. Lodieu, D. Barrado, E. Solano, P. Cruz, R. Tata, N. Phan-Bao, A. Burgasser   +16 more
doaj   +1 more source

Late-T And Y Dwarf Parallaxes From The Spitzer Space Telescope

, 2017
Y dwarfs provide a unique opportunity to study free-floating, planetary-mass objects with atmospheric temperatures approaching those of known Jupiter-like exoplanets. Obtaining distances to these objects is an essential step in determining absolute physical parameters such as mass, age, and metallicity.
openaire   +1 more source

Convergent genome streamlining accompanies independent miniaturization in the world's smallest fishes. [PDF]

Proc Natl Acad Sci U S A
Sudasinghe H, Matschiner M, Britz R, Conway KW, Tan HH, Salzburger W, Peichel CL, Rüber L.   +7 more
europepmc   +1 more source

Atmospheric Modeling of Brown Dwarfs With PICASO, SONORA, and JWST

Brown dwarfs are celestial bodies outside the solar system that are more massive than planets, but less massive than stars. Since they are less massive than stars, they do not fuse hydrogen in their core, but rather cool slowly over time.
Stephens, Denise, Roberts, Brayden, Lothringer, Joshua   +2 more
core   +1 more source

The abundance and radial distribution of faint and ultra-faint dwarfs in galaxy clusters. [PDF]

Mon Not R Astron Soc
Sadhu P, Sales LV, Navarro JF, Errani R, Benavides J, Peng EW.   +5 more
europepmc   +1 more source

A universal brown dwarf desert formed between planets and stars. [PDF]

Proc Natl Acad Sci U S A
Cui K, Xiao GY, Feng F, Liu B, Nayakshin S, Hall C, Guo K, Lai D, Ogihara M, Rui Y, Boss AP, Butler RP, Xuan Y.   +12 more
europepmc   +1 more source

Analysis of the fractional relativistic polytropic gas sphere. [PDF]

Sci Rep, 2023
Aboueisha MS, Nouh MI, Abdel-Salam EA, Kamel TM, Beheary MM, Gadallah KAK.   +5 more
europepmc   +1 more source

Nox: A Hypothetical Y-type Brown Dwarf-Companion to the Sun

Recent astronomical discoveries have revealed methane emissions on cold brown dwarfs, highlighting similarities in atmospheric chemistry between these substellar objects and gas giant planets. These findings challenge traditional theories of star formation and push the boundaries of what constitutes stellar mass.
openaire   +1 more source

White Dwarfs in omega Centauri: Preliminary Evidence

, 2005
We present accurate and deep multiband B,R,Hα data for the globular cluster ω Cen collected with the Advanced Camera for Surveys on HST. The photometric catalogue includes more than one million stars.
Pulone, L., Calamida, A., PRADA MORONI, PIER GIORGIO, Corsi, C. E., Buonanno, R., Stetson, P. B., Monelli, M., Iannicola, G., Bono, G., Ferraro, I.   +9 more
core