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2MASS J05325346+8246465

Star in the constellation Camelopardalis

Star in the constellation Camelopardalis

2MASS 0532+8246

2MASS J05325346+8246465 (abbreviated 2MASS J0532+8246) is possibly the first brown dwarf observed in the galactic halo of the Milky Way, and the first known substellar subdwarf star. It was discovered from Two Micron All-Sky Survey data, and verified by observations at Palomar Observatory and W. M. Keck Observatory. It has a low metallicity, which indicates it is an old star.

The mass and temperature of 2MASS 0532+8246 makes it a rare object in stellar-substellar gap between conventional stars and brown dwarfs. It produces roughly half of its luminosity from hydrogen fusion.

In 2008 it was discovered that this object is on a retrograde galactic orbit that is both eccentric and extends well away from the plane, making this object a member of the galactic halo. In 2024 this object was identified as a possible member of the Thamnos populations, together with the T subdwarf CWISE J113010.07+313944.7. Thamnos has two substructures called Thamnos 1 and Thamnos 2, both were identified in 2019 from Gaia data. Thamnos is likely the remnant of a dwarf galaxy that was accreted into the Milky Way and consists of metal-poor stars that formed between 8 and 12.89 billion years ago.

References

References

  1. {{cite constellation. 2MASS J05325346+8246465
  2. (2003). "The First Substellar Subdwarf? Discovery of a Metal-poor L Dwarf with Halo Kinematics". The Astrophysical Journal.
  3. (2019). "Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs". Monthly Notices of the Royal Astronomical Society.
  4. (2017). "Primeval very low-mass stars and brown dwarfs – II. The most metal-poor substellar object". Monthly Notices of the Royal Astronomical Society.
  5. (2020). "WISEA J041451.67–585456.7 and WISEA J181006.18–101000.5: The First Extreme T-type Subdwarfs?". The Astrophysical Journal.
  6. (2006-03-01). "The First High-Resolution Spectra of 1.3 L Subdwarfs". The Astronomical Journal.
  7. Deepak. (2024-12-01). "Stellar substructures in the Galactic disc and halo: Properties, origins, and evolution". Journal of Astrophysics and Astronomy.
  8. (2019-11-01). "Multiple retrograde substructures in the Galactic halo: A shattered view of Galactic history". Astronomy and Astrophysics.
  9. (2008-01-01). "Parallax and Luminosity Measurements of an L Subdwarf". The Astrophysical Journal.
  10. Burgasser, Adam J.. (2003). "The First Substellar Subdwarf? Discovery of a Metal-Poor L Dwarf with Halo Kinematics.". The Astrophysical Journal.
  11. {{Cite Gaia DR3. 558122277038055808
  12. Faherty, Jacqueline K.. (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". [[The Astrophysical Journal]].
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camelopardalis brown-dwarfs l-type-brown-dwarfs free-floating-substellar-objects population-ii-stars
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