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A Near-Infrared Spectroscopic Study of the Accreting Magnetic White Dwarf SDSS J121209.31+013627.7 and its Substellar Companion

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arxiv 0710.4969 v1 pith:VLYNO5OL submitted 2007-10-25 astro-ph

A Near-Infrared Spectroscopic Study of the Accreting Magnetic White Dwarf SDSS J121209.31+013627.7 and its Substellar Companion

classification astro-ph
keywords dwarfmagneticemissionsubstellarwhitecompanionexcessnear-infrared
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 3 Pith papers

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  1. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 accept novelty 6.5

    TESS data give photometric periods for 1362 cataclysmic variables (hundreds new), confirming the 2–3 h gap, a sample median of 3.68 h, and spin periods for 83 intermediate polars.

  2. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 conditional novelty 6.0

    TESS photometry yields coherent periods for 1,362 CVs, including roughly 465–565 first determinations, and confirms the 2–3 h period gap with a median period near 3.68 h.

  3. Cataclysmic Variables Photometric Periods from TESS

    astro-ph.SR 2026-07 conditional novelty 5.0

    TESS photometry of 1,362 cataclysmic variables yields 565 new period measurements, confirms the 2–3 h period gap, and finds a median CV photometric period of 3.681 h.