2017A&A...598L...6S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:32:45

2017A&A...598L...6S - Astronomy and Astrophysics, volume 598, L6-6 (2017/2-1)

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

STELZER B., DE MARTINO D., CASEWELL S.L., WYNN G.A. and ROY M.

Abstract (from CDS):

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 3.2x10–14M/yr from the X-ray luminosity (∼3x1029erg/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 (0.1R), making Roche-lobe overflow the likely accretion mechanism in this system.

Abstract Copyright: © ESO, 2017

Journal keyword(s): X-rays: binaries - accretion, accretion disks - stars: individual: SDSS J121209.31+013627.7 - white dwarfs - brown dwarfs

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* EF Eri NL* 03 14 13.2527107604 -22 35 42.917018996   15.4 14.53 13.5   ~ 410 0
2 SDSS J121209.30+013627.7 No* 12 12 09.3084841458 +01 36 27.771074225           DAH+dL8 41 0
3 SDSS J143317.78+101122.8 DN* 14 33 17.7876511635 +10 11 23.489772646     18.86     ~ 38 0
4 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 888 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:32:45

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