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X-ray orbital modulation of a white dwarf accreting from an L dwarf: The system SDSS J121209.31+013627.7

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arxiv 1701.02894 v1 pith:ZCR4BG6J submitted 2017-01-11 astro-ph.SR astro-ph.HE

X-ray orbital modulation of a white dwarf accreting from an L dwarf: The system SDSS J121209.31+013627.7

B. Stelzer , D. de Martino , S. L. Casewell , G. A. Wynn , M. Roy This is my paper
classification astro-ph.SR astro-ph.HE
keywords dwarfx-rayaccretionsystemwhitej121209magneticmodulation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In an XMM-Newton observation of the binary SDSS J121209.31+013627.7, consisting of a white dwarf and an L dwarf, we detect X-ray orbital modulation as proof of accretion from the substellar companion onto the magnetic white dwarf. We constrain the system geometry (inclination as well as magnetic and pole-cap angle) through modelling of the X-ray light curve, and we derive a mass accretion rate of 3.2 10^(-14) M_sun/yr from the X-ray luminosity (~ 3 10^(29) erg/s). From X-ray studies of L dwarfs, a possible wind driven from a hypothesized corona on the substellar donor is orders of magnitude too weak to explain the observed accretion rate, while the radius of the L dwarf is comparable to its Roche lobe (0.1 R_sun), making Roche-lobe overflow the likely accretion mechanism in this system.

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