scholarly journals Spitzer Identification of the Least Massive Known Brown Dwarf with a Circumstellar Disk

2005 ◽  
Vol 620 (1) ◽  
pp. L51-L54 ◽  
Author(s):  
K. L. Luhman ◽  
Paola D'Alessio ◽  
Nuria Calvet ◽  
Lori E. Allen ◽  
Lee Hartmann ◽  
...  
Keyword(s):  
Circumstellar Disk ◽  
Brown Dwarf

Discovery of a Planetary-Mass Brown Dwarf with a Circumstellar Disk

2005 ◽  
Vol 635 (1) ◽  
pp. L93-L96 ◽  
Author(s):  
K. L. Luhman ◽  
Lucía Adame ◽  
Paola D'Alessio ◽  
Nuria Calvet ◽  
Lee Hartmann ◽  
...  
Keyword(s):  
Circumstellar Disk ◽  
Brown Dwarf ◽  
Planetary Mass

scholarly journals Infrared-excess white dwarfs in the Gaia 100 pc sample

2019 ◽  
Author(s):  
A Rebassa-Mansergas ◽  
E Solano ◽  
S Xu(#x8BB8;#x5072;#x827A;) ◽  
C Rodrigo ◽  
F M Jiménez-Esteban ◽  
...  
Keyword(s):  
White Dwarf ◽  
White Dwarfs ◽  
Spectral Energy Distribution ◽  
Spectral Energy ◽  
Circumstellar Disk ◽  
Infrared Photometry ◽  
Brown Dwarf ◽  
Limited Sample ◽  
Infrared Excess ◽  
A Value

Abstract We analyse the 100 pc Gaia white dwarf volume-limited sample by means of VOSA (Virtual Observatory SED Analyser) with the aim of identifying candidates for displaying infrared excesses. Our search focuses on the study of the spectral energy distribution (SED) of 3,733 white dwarfs with reliable infrared photometry and GBP − GRP colours below 0.8 mag, a sample which seems to be nearly representative of the overall white dwarf population. Our search results in 77 selected candidates, 52 of which are new identifications. For each target we apply a two-component SED fitting implemented in VOSA to derive the effective temperatures of both the white dwarf and the object causing the excess. We calculate a fraction of infrared-excess white dwarfs due to the presence of a circumstellar disk of 1.6±0.2%, a value which increases to 2.6±0.3% if we take into account incompleteness issues. Our results are in agreement with the drop in the percentage of infrared excess detections for cool (<8,000 K) and hot (>20,000 K) white dwarfs obtained in previous analyses. The fraction of white dwarfs with brown dwarf companions we derive is ≃0.1–0.2%.

scholarly journals HubbleandSpitzerObservations of an Edge‐on Circumstellar Disk around a Brown Dwarf

2007 ◽  
Vol 666 (2) ◽  
pp. 1219-1225 ◽  
Author(s):  
K. L. Luhman ◽  
Lucia Adame ◽  
Paola D’Alessio ◽  
Nuria Calvet ◽  
Kim K. McLeod ◽  
...  
Keyword(s):  
Circumstellar Disk ◽  
Brown Dwarf

The circumstellar disk of the Be star 28 (ω) CMa

2003 ◽  
Vol 6 ◽  
pp. 257-257
Author(s):  
S. Štefl ◽  
W. Nowotny-Schipper ◽  
J. Reunanen
Keyword(s):  
Circumstellar Disk ◽  
Be Star

An Improved Optical Spectrum and New Model Fits of the Likely Brown Dwarf GD 165B

1999 ◽  
Vol 519 (2) ◽  
pp. 834-843 ◽  
Author(s):  
J. Davy Kirkpatrick ◽  
France Allard ◽  
Tom Bida ◽  
Ben Zuckerman ◽  
E. E. Becklin ◽  
...  
Keyword(s):  
Optical Spectrum ◽  
Brown Dwarf ◽  
New Model ◽  
Model Fits

scholarly journals A Deep Large area Search for Low Luminosity Stars

1998 ◽  
Vol 11 (1) ◽  
pp. 435-435
Author(s):  
Hugh R.A. Jones ◽  
Mike R.S. Hawkins
Keyword(s):  
Spectral Type ◽  
Low Temperatures ◽  
Current Model ◽  
Brown Dwarfs ◽  
Evolutionary Models ◽  
Spectral Indices ◽  
Late Type ◽  
Brown Dwarf ◽  
Large Area ◽  
M Dwarfs

In a recent survey for faint red stars from a digital stack of Schmidt plates a number of candidate objects were identified. Parallax’s for three of these objects have been reported showing them to have luminosities which interpreted within the available evolutionary models indicate them to be good brown dwarf candidates. Here we examine spectra of these objects and others from the plate stack. Using standard spectral indices we find that for a given spectral type their spectra are more consistent with the Pleiades brown dwarfs (PPL 15, Teide 1 and Calar 3) than with standard late-type M dwarfs. Our interpretation is that this is due to their selection by RF IN colours which at values > 3 preferentially selects objects with relatively low gravities. For late-type M dwarfs and brown dwarfs low gravities are expected to be a reliable indication of youth. We also notice that the stack objects generally have strong FeH absorption for their spectral type. Current model atmospheres suggest that FeH strongly increases in strength toward lower metallicities and lower temperatures. We believe that this is not consistent with the available observational evidence from late-type M dwarfs. It is possible that solid Fe is forming inthe low temperature atmospheres relatively depleting FeH strengths toward lower temperatures. We find some evidence that for dwarfs at low temperatures dust formation is less prevalent in lower gravity objects suggesting that dwarfs at low temperatures stronger FeH may be an indication of youth. In addition to the spectral evidence the three stack objects whose parallax’s have been measured show small tangential velocities which is a further indication of youth.

scholarly journals CHARACTERIZING THE BROWN DWARF FORMATION CHANNELS FROM THE INITIAL MASS FUNCTION AND BINARY-STAR DYNAMICS

2015 ◽  
Vol 800 (1) ◽  
pp. 72 ◽  
Author(s):  
Ingo Thies ◽  
Jan Pflamm-Altenburg ◽  
Pavel Kroupa ◽  
Michael Marks
Keyword(s):  
Binary Star ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Brown Dwarf

New line profiles of sodium and potassium perturbed by helium for brown dwarf and very cool white dwarf stars

2008 ◽  
Author(s):  
M. Christova ◽  
N. F. Allard ◽  
J. F. Kielkopf ◽  
D. Homeier ◽  
F. Allard ◽  
...  
Keyword(s):  
White Dwarf ◽  
Line Profiles ◽  
Brown Dwarf ◽  
Dwarf Stars ◽  
White Dwarf Stars ◽  
Sodium And Potassium

A Circumstellar Disk Around beta Pictoris

Science ◽  
1984 ◽  
Vol 226 (4681) ◽  
pp. 1421-1424 ◽  
Author(s):  
B. A. SMITH ◽  
R. J. TERRILE
Keyword(s):  
Circumstellar Disk ◽  
Beta Pictoris

scholarly journals 2MASS J035523.37+113343.7: A YOUNG, DUSTY, NEARBY, ISOLATED BROWN DWARF RESEMBLING A GIANT EXOPLANET

2012 ◽  
Vol 145 (1) ◽  
pp. 2 ◽  
Author(s):  
Jacqueline K. Faherty ◽  
Emily L. Rice ◽  
Kelle L. Cruz ◽  
Eric E. Mamajek ◽  
Alejandro Núñez
Keyword(s):  
Brown Dwarf
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