WISE Y Dwarfs As Probes of the Brown Dwarf-Exoplanet Connection
Chas Beichman,Christopher R. Gelino,J. Davy Kirkpatrick,Michael C. Cushing,Sally Dodson-Robinson,Mark S. Marley,Caroline V. Morley,Edward L. Wright +7 more
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TLDR
For ages greater than a few Gyr, as suggested from kinematic considerations, they find masses of 10-30 M$Jup}$ based on standard models for the evolution of low mass objects with a range of mass estimates for individual objects depending on the model in question as discussed by the authors.Abstract:
We have determined astrometric positions for 15 WISE-discovered late-type brown dwarfs (6 T8-9 and 9 Y dwarfs) using the Keck II telescope, the Spitzer Space Telescope, and the Hubble Space Telescope. Combining data from 8 to 20 epochs we derive parallactic and proper motions for these objects which put the majority within 15 parsecs. For ages greater than a few Gyr, as suggested from kinematic considerations, we find masses of 10-30 M$_{Jup}$ based on standard models for the evolution of low mass objects with a range of mass estimates for individual objects depending on the model in question. Three of the coolest objects have effective temperatures $\sim$ 350 K and inferred masses of 10-15 M$_{Jup}$. Our parallactic distances confirm earlier photometric estimates (Kirkpatrick et al. 2012) and direct measurements (Marsh et al. 2013, Beichman et al. 2013, Dupuy and Krauss 2013) and suggest that the number of objects with masses below about 15 M$_{Jup}$ must be flat or declining relative to higher mass objects. The masses of the coldest Y dwarfs may be similar to those inferred for recently imaged planet-mass companions to nearby young stars. Objects in this mass range, which appear to be rare in both the interstellar and proto-planetary environments, may both have formed via gravitational fragmentation: the brown dwarfs in interstellar clouds and companion objects in a protoplanetary disk. In both cases, however, the fact that objects in this mass range are relatively infrequent, suggests that this mechanism must be inefficient in both environments.read more
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Journal ArticleDOI
Atmospheres of brown dwarfs
TL;DR: Brown dwarfs cover a range of effective temperatures which cause brown dwarfs atmospheres to be a sequence that gradually changes from a M-dwarf-like spectrum into a planetlike spectrum as discussed by the authors.
Journal ArticleDOI
A 1.46–2.48 μm spectroscopic atlas of a T6 dwarf (1060 K) atmosphere with IGRINS: First detections of H2S and H2, and verification of H2O, CH4, and NH3 line lists
Megan E. Tannock,Stanimir Metchev,Callie Hood,Gregory N. Mace,Jonathan J. Fortney,Caroline V. Morley,Daniel T. Jaffe,Roxana Lupu +7 more
TL;DR: In this article , the authors present a detailed spectroscopic atlas with molecular identifications across the H and K bands of the near-infrared spectrum of the T6 dwarf 2MASS J08173001−6155158.
Journal ArticleDOI
JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05–014350.4
Per Calissendorff,Matthew De Furio,Michael Meyer,Loic Albert,Christian Aganze,Mohamad Ali-Dib,Daniella C. Bardalez Gagliuffi,Frédérique Baron,Chas Beichman,Adam J. Burgasser,Michael C. Cushing,Jacqueline K. Faherty,C. Fontanive,Christopher R. Gelino,John E. Gizis,Alexandra Z. Greenbaum,J. Davy Kirkpatrick,S. K. Leggett,Frantz Martinache,David Mary,Mamadou N'Diaye,Benjamin J. S. Pope,Thomas L. Roellig,Johannes Sahlmann,Anand Sivaramakrishnan,Daniel Thorngren,Marie Ygouf,Thomas Vandal +27 more
TL;DR: The first brown dwarf binary system with a Y dwarf primary, WISE J033605.4 as mentioned in this paper , was observed with NIRCam on JWST with the F150W and F480M filters.
Journal ArticleDOI
Using old and new approaches: Determining physical properties of brown dwarfs with empirical relations and machine learning models
S. J. Feeser,William M. J. Best +1 more
TL;DR: In this paper , the authors used machine learning models to directly infer physical properties of brown dwarfs from their photometry and spectra using The Cannon, showing that absolute magnitudes, spectral types, and spectral indices can be determined from low-resolution SpeX prism spectra of L and T dwarfs without trigonometric parallax measurements and with precisions competitive with commonly used methods.
Journal ArticleDOI
JWST Observations of the Enigmatic Y-Dwarf WISE 1828+2650. I. Limits to a Binary Companion
Matthew De Furio,Ben W. P. Lew,Chas Beichman,Thomas L. Roellig,G. Bryden,David R. Ciardi,Michael Meyer,Marcia J. Rieke,Alexandra Z. Greenbaum,Jarron Leisenring,Jorge Llop-Sayson,Marie Ygouf,Loic Albert,Martha L. Boyer,Daniel J. Eisenstein,Klaus W. Hodapp,Scott D. Horner,Doug Johnstone,Doug Kelly,Karl Misselt,George H. Rieke,John Stansberry,Erick T. Young +22 more
TL;DR: In this paper , the authors describe JWST/NIRCam observations of WISE 1828+2650 in six filters to address the binarity question and to provide new photometry to be used in model fitting.
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TL;DR: In this article, the authors present a survey of the role of radiation in high energy particle physics and cosmology, including the following: 1. Continuum Radiation. 2. Monochromatic (Line) Radiation. 3. Gas Processes. 4. Nuclear Astrophysics and High Energy Particles.
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