Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-25
Astronomy and Astrophysics
Astrophysics
28 pages, 5 figures, Accepted to ApJ
Scientific paper
10.1086/524933
The nature of the excess near-infrared emission associated with the magnetic white dwarf commonly known as SDSS 1212 is investigated primarily through spectroscopy, and also via photometry. The inferred low mass secondary in this system has been previously detected by the emission and variation of H$\alpha$, and the $1-2.5$ $\mu$m spectral data presented here are consistent with the presence of a late L or early T dwarf. The excess flux seen beyond 1.5 $\mu$m in the phase-averaged spectrum is adequately modeled with an L8 dwarf substellar companion and cyclotron emission in a 7 MG magnetic field. This interesting system manifests several observational properties typical of polars, and is most likely an old interacting binary with a magnetic white dwarf and a substellar donor in an extended low state.
Burleigh Matthew R.
Farihi Jay
Hoard Donald Wayne
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