Results 101 to 110 of about 1,220,192 (373)

Ultracool Field Brown Dwarf Candidates Selected at 4.5 microns [PDF]

, 2010
We have identified a sample of cool field brown dwarf candidates using IRAC data from the Spitzer Deep, Wide-Field Survey (SDWFS). The candidates were selected from 400,000 SDWFS sources with [4.5] = 1.5 and [4.5] - [8.0]
A. M. Ghez, Amy Mainzer, Anthony H. Gonzalez, Arjun Dey, Ashby, Bochanski, Burgasser, Burgasser, Burrows, Bussmann, Daniel Stern, David Vollbach, Davidge, de Vries, Dey, Edward L. Wright, Eilat Glikman, Eisenhardt, Enoch, Epchtein, Fazio, Glass, Golimowski, Hawley, Houck, Hubeny, J. Davy Kirkpatrick, Jannuzi, Kenter, Kirkpatrick, Kirkpatrick, Kozlowski, Leggett, Leggett, Liu, Luhman, Luhman, Mark Brodwin, Matthew L. N. Ashby, Michael J. I. Brown, Patten, Peter R. M. Eisenhardt, Quinn Konopacky, R. S. Bussmann, Reid, Robitaille, Roger L. Griffith, Saumon, Shelley A. Wright, Skrutskie, Stern, Stern, York, Zapatero Osorio   +53 more
core   +2 more sources

THE SPECTRAL ENERGY DISTRIBUTION OF THE COLDEST KNOWN BROWN DWARF [PDF]

, 2016
WISE J085510.83–071442.5 (hereafter WISE 0855–0714) is the coldest known brown dwarf (∼250 K) and the fourth-closest known system to the Sun (2.2 pc). It has been previously detected only in the J band and two mid-IR bands. To better measure its spectral
K. Luhman, T. Esplin
semanticscholar   +1 more source

Histochemical indications for a chemically complex signal produced by the cervical gill slit gland of the pygmy sperm whale (Kogia breviceps)

The Anatomical Record, EarlyView.
Abstract The pygmy sperm whale (Kogia breviceps) possesses an exocrine gland associated with its false gill slit pigmentation pattern. The cervical gill slit gland is a compound tubuloalveolar gland that produces a holocrine secretion and displays maturational changes in size and secretory histology. While the morphology of the cervical gill slit gland
Tiffany F. Keenan, William A. McLellan, Sentiel A. Rommel, Alexander M. Costidis, Craig A. Harms, J. G. M. Thewissen, Susan J. Rehorek, David S. Rotstein, Mark D. Gay, Alison R. Taylor, Heather N. Koopman, Ying Wang, Stephanie Kamel, D. Ann Pabst   +13 more
wiley   +1 more source

Time-resolved Optical Polarization Monitoring of the Most Variable Brown Dwarf

The Astronomical Journal, 2023
Recent atmospheric models for brown dwarfs suggest that the existence of clouds in substellar objects is not needed to reproduce their spectra, nor their rotationally induced photometric variability, believed to be due to the heterogeneous cloud coverage
Elena Manjavacas, Paulo A. Miles-Páez, Theodora Karalidi, Johanna M. Vos, Max L. Galloway, Julien H. Girard   +5 more
doaj   +1 more source

Binary frequency of very young brown dwarfs at separations smaller than 3 AU

, 2008
Searches for companions of brown dwarfs by direct imaging mainly probe orbital separations > 3-10 AU. On the other hand, previous radial velocity surveys of brown dwarfs are mainly sensitive to separations smaller than 0.6 AU. It has been speculated that
Ahmic, Basri, Bate, Bate, Boss, Bouy, Burgasser, Close, Comerón, Comerón, Gizis, Goodwin, Guenther, Joergens, Joergens, Joergens, Joergens, Kenyon, Kouwenhoven, Kroupa, Kurosawa, Luhman, Luhman, Maxted, Mizuno, Naylor, Neuhäuser, Neuhäuser, Padoan, Pinfield, Prato, Prato, Reid, Reid, Reipurth, Shatsky, Simon, Stamatellos, Stassun, Sterzik, Umbreit, V. Joergens, Whitworth, Zapatero Osorio   +43 more
core   +1 more source

The Galactic disk mass function: reconciliation of the HST and nearby determinations [PDF]

, 2003
We derive and parametrize the Galactic mass function (MF) below 1 $\msol$ characteristic of both single objects and binary systems. We resolve the long standing discrepancy between the MFs derived from the HST and from the nearby luminosity functions ...
Baraffe I., Delfosse X., Delfosse X., Duquennoy A., Gilles Chabrier, Kroupa P., Mera D., Scalo J. M.   +7 more
core   +4 more sources

Searching for chemical signatures of brown dwarf formation [PDF]

, 2017
Recent studies have shown that close-in brown dwarfs in the mass range 35-55 M$_{\rm Jup}$ are almost depleted as companions to stars, suggesting that objects with masses above and below this gap might have different formation mechanisms.
J. Maldonado, E. Villaver
semanticscholar   +1 more source

The physics of brown dwarfs

Journal of Physics: Condensed Matter, 1998
13 pages, Latex file, uses iopams.cls, Oji International Seminar on the Quest for New Physical Phases Under Extreme ...
openaire   +3 more sources

Listening to Hong Kong children's perspectives through pretend play

British Educational Research Journal, EarlyView.
Abstract Quality in early childhood education and care (ECEC) has become an increasing concern in recent years. The issue has been regularly discussed by different stakeholders. However, the rising concern regarding quality in ECEC has not seriously taken into account children's perspectives.
Suzannie K. Y. Leung
wiley   +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