Results 61 to 70 of about 111,392 (348)

A Surprising Reversal of Temperatures in the Brown-Dwarf Eclipsing Binary 2MASS J05352184-0546085

, 2007
The newly discovered brown-dwarf eclipsing binary 2MASS J05352184-0546085 provides a unique laboratory for testing the predictions of theoretical models of brown-dwarf formation and evolution. The finding that the lower-mass brown dwarf in this system is
Baraffe I., D’Antona F., Hut P., Jeff A. Valenti, Keivan G. Stassun, Maxted P. F. L., Montalban J., Neuhaeuser R., Robert D. Mathieu, Rucinski S. M., Siess L.   +10 more
core   +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

MACHOs as brown dwarfs

, 1998
Recent observations of microlensing events in the Large Magellanic Cloud suggest that a sizable fraction of the galactic halo is in the form of Massive Astrophysical Compact Halo Objects (MACHOs). Although the average MACHO mass is presently poorly known, the value $\sim 0.1 M_{\odot}$ looks as a realistic estimate, thereby implying that brown dwarfs ...
DE PAOLIS, Francesco, INGROSSO, Gabriele, P. Jetzer, M. Roncadelli   +3 more
openaire   +3 more sources

Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59

Astronomische Nachrichten, EarlyView.
ABSTRACT Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence of five planets, three of which are transiting.
Paul I. Schwarz, Stefan Dreizler, René Heller   +2 more
wiley   +1 more source

The Minimum Jeans Mass, Brown Dwarf Companion IMF, and Predictions for Detection of Y-type Dwarfs

, 2008
Cool L- and T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the yet cooler Y-type spectral class (Teff
Allen, Allen, B. Zuckerman, Baraffe, Barnes, Bate, Becklin, Bessell, Boyd, Burgasser, Burgasser, Burgasser, Burrows, Chauvin, Chauvin, Chauvin, Chauvin, Chen, Close, Delorme, Els, Farihi, Fischer, Gaidos, Geballe, Geballe, Gizis, Golimowski, I. Song, Itoh, Kasper, Kasper, Kirkpatrick, Kirkpatrick, Kirkpatrick, Konopacky, Lafrenière, Lane, Liu, Low, Lowrance, Lowrance, Luhman, Luhman, Marcy, Marois, Masciadri, McElwain, McElwain, Metchev, Metchev, Mohanty, Mugrauer, Nakajima, Neuhauser, Nielsen, Nordström, Norman, Padoan, Padoan, Potter, Rafikov, Rebolo, Rice, Scholz, Seifahrt, Song, Song, Tokovinin, Warren, White, Whitworth, Wilson, Zuckerman, Zuckerman   +74 more
core   +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

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

Psychiatric Emergency Visits of Autistic Adults With or Without Documented Borderline Personality Disorder

Autism Research, EarlyView.
ABSTRACT Autism and borderline personality disorder (BPD) are each associated with increased psychiatric emergency department (PsyED) use, yet the service impact of coexisting autism–BPD remains unclear. We conducted a retrospective chart review of 1027 PsyED visits by 345 autistic adults (2018–2020) at an urban Canadian psychiatric hospital to compare
Ching‐Hua Julie Lee, Louisa Lok Yee Man, Alexandra Morra, Carleigh Pace‐Tonna, Chantelle Castelino, Valerie Courchesne, Margot Frayne, Vanessa Luk, Paria Baharikhoob, Patrick Jachyra, Juveria Zaheer, Stephanie H. Ameis, Hsiang‐Yuan Lin, Amanda Sawyer, Yona Lunsky, Meng‐Chuan Lai   +15 more
wiley   +1 more source

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

, 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   +2 more sources

A new benchmark T8-9 brown dwarf and a couple of new mid-T dwarfs from the UKIDSS DR5+ LAS [PDF]

, 2010
Benchmark brown dwarfs are those objects for which fiducial constraints are available, including effective temperature, parallax, age, metallicity. We searched for new cool brown dwarfs in 186 sq.deg.
Allard, Allen, Alonso, Artigau, B. Goldman, Baraffe, Bertin, Bessel, Beuzit, Burgasser, Burgasser, Burningham, Burningham, Burrows, Burrows, C. Clemens, Casali, Chiu, Cushing, Cutri, DeGennaro, Del Burgo, Delfosse, Delorme, Ducourant, Faherty, Goldman, Golimowski, Greiner, Greiner, Hambly, Hawley, Heintz, Helling, Helling, Henry, Hewett, Hodgkin, J. Greiner, Jameson, Kirkpatrick, Kirkpatrick, Lawrence, Leggett, Leggett, Leggett, Leggett, Liu, Lodieu, Lodieu, Looper, Luyten, McLean, Montes, Morales, Morel, Nakajima, Nidever, Perryman, Pinfield, Pinfield, Pojmanski, Robin, Ross, S. Marsat, Salim, Saumon, Schwope, Short, Smart, Stephens, Stephens, T. Henning, Tinney, Tinney, Tsuji, Van Leeuwen, Vrba, Warren, West, West, Zuckerman   +81 more
core   +1 more source