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HD 52359


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A companion to AB Pic at the planet/brown dwarf boundary
We report deep imaging observations of the young, nearby star AB Pic, amember of the large Tucana-Horologium association. We have detected afaint, red source 5.5'' South of the star with JHK colors compatiblewith that of a young substellar L dwarf. Follow-up observations at twoadditional epochs confirm, with a confidence level of 4.7σ, thatthe faint red object is a companion to AB Pic rather than it being astationary background object. A low resolution K-band spectrum indicatesan early-L spectral type for the companion. Finally, evolutionary modelpredictions based on the JHK photometry of AB Pic b indicate a mass of13 to 14 MJup if its age is ~30 Myr. Is AB Pic b a massiveplanet or a minimum mass brown dwarf?

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Observation and Astrometry data

Constellation:Puppis
Right ascension:06h59m11.68s
Declination:-38°49'54.9"
Apparent magnitude:8.76
Distance:684.932 parsecs
Proper motion RA:-6.3
Proper motion Dec:5.3
B-T magnitude:8.666
V-T magnitude:8.753

Catalogs and designations:
Proper Names
HD 1989HD 52359
TYCHO-2 2000TYC 7628-992-1
USNO-A2.0USNO-A2 0450-03213524
HIPHIP 33632

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