منابع مشابه
A Search for L Dwarf Binary Systems
We present analysis of Hubble Space Telescope (HST ) planetary camera images of 20 L dwarfs identiÐed in the course of the Two Micron All Sky Survey. Four of the targets, 2MASSW J0746425]200032, 2MASSs J0850359]105716, 2MASSW J0920122]351742, and 2MASSW J1146345]223053, have faint red companions at separations between and (1.6È7.6 AU). Ground-based infrared imaging con0A.07 0A.29 Ðrms the last ...
متن کاملSdss J080531.84+481233.0: an Unresolved L Dwarf/t Dwarf Binary
SDSS J080531.84+481233.0 is a peculiar L-type dwarf that exhibits unusually blue near-infrared and mid-infrared colors and divergent optical (L4) and near-infrared (L9.5) spectral classifications. These peculiar spectral traits have been variously attributed to condensate cloud effects or subsolar metallicity. Here I present an improved near-infrared spectrum of this source which further demons...
متن کاملPHL 5038 : A spatially resolved white dwarf + brown dwarf binary
A near-infrared excess is detected at the white dwarf PHL 5038 in UKIDSS photometry, consistent with the presence of a cool, substellar companion. We have obtained Hand K-grism spectra and images of PHL 5038 using NIRI on Gemini North. The target is spatially and spectrally resolved into two components; an 8000 K DA white dwarf, and a likely L8 brown dwarf companion, separated by 0.94 ′′. The s...
متن کاملNon-dissipative tidal synchronization in accreting binary white dwarf systems
We study a non-dissipative hydrodynamical mechanism that can stabilize the spin of the accretor in an ultracompact double white dwarf (WD) binary. This novel synchronization mechanism relies on a non-linear coupling between tides and the uniform (or rigid) rotation mode, which spins down the background star. The essential physics of the synchronization mechanism is summarized as follows. As the...
متن کاملLisa Astronomy of Double White Dwarf Binary Systems
The Laser Interferometer Space Antenna (LISA) will provide the largest observational sample of (interacting) double white dwarf binaries, whose evolution is driven by radiation reaction and other effects, such as tides and mass transfer. We show that, depending on the actual physical parameters of a source, LISA will be able to provide very different quality of information: for some systems LIS...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2001
ISSN: 0004-6256
DOI: 10.1086/318023