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- W2572143803 abstract "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 × 10-14M⊙/ yr from the X-ray luminosity (~3 × 1029 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⊙), making Roche-lobe overflow the likely accretion mechanism in this system." @default.
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- W2572143803 date "2017-01-27" @default.
- W2572143803 modified "2023-10-14" @default.
- W2572143803 title "X-ray orbital modulation of a white dwarf accreting from an L dwarf" @default.
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- W2572143803 doi "https://doi.org/10.1051/0004-6361/201630038" @default.
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