A Possible Brown Dwarf Companion to the White Dwarf GD 1400
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چکیده
منابع مشابه
A Possible Brown Dwarf Companion to the White Dwarf Gd1400
An unresolved, likely L dwarf companion to the DA white dwarf GD1400 is reported. This would be only the second such system known, discovered 17 years after the prototype L dwarf, GD165B, was determined to be a companion to a white dwarf. Photometric observations and model predicted stellar parameters of the well studied white dwarf primary indicate that GD1400B has J−K & 2.0 and MK = 12.13 mag...
متن کاملSe p 20 05 MID - INFRARED OBSERVATIONS OF THE WHITE DWARF BROWN DWARF BINARY GD 1400
Fluxes are measured for the DA white dwarf plus brown dwarf pair GD 1400 with the Infrared Array Camera on the Spitzer Space Telescope. GD 1400 displays an infrared excess over the entire 3 − 8µm region consistent with the presence of a mid-to late-type L dwarf companion. A discussion is given regarding current knowledge of this unique system.
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The white dwarf Giclas 29-38 has attracted much attention due to its large infrared excess and the suggestion that excess might be due to a companion brown dwarf. We observed this object using speckle interferometry at the Keck telescope, obtaining diffraction-limited resolution (55 milliarcseconds) at K band, and found it unresolved. Assuming the entire K band excess is due to a single point-l...
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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 کاملDiscovery of an Ultracool White Dwarf Companion
The discovery of a low luminosity common proper motion companion to the white dwarf GD392 at a wide separation of 46 is reported. BV RIJHK photometry strongly indicates suppressed flux at all near infrared wavelengths. Thus, GD392B is one of the few white dwarfs to show collision-induced absorption due to the presence of photospheric H2 and the first ultracool white dwarf detected as a companio...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2004
ISSN: 0004-6256,1538-3881
DOI: 10.1086/423919