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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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Pupa |
| Sað Açýklýk: | 06h59m11.68s |
| Yükselim: | -38°49'54.9" |
| Görünürdeki Parlaklýk: | 8.76 |
| Uzaklýk: | 684.932 parsek |
| özdevim Sað Açýklýk: | -6.3 |
| özdevim Yükselim: | 5.3 |
| B-T magnitude: | 8.666 |
| V-T magnitude: | 8.753 |
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