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http://hdl.handle.net/20.500.12386/27279
Titolo: | X-ray orbital modulation of a white dwarf accreting from an L dwarf. The system SDSS J121209.31+013627.7 | Autori: | Stelzer, B. DE MARTINO, Domitilla Casewell, S. L. Wynn, G. A. Roy, M. |
Data pubblicazione: | 2017 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 598 | Da pagina:: | L6 | 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<SUP>-14</SUP>M<SUB>☉</SUB>/ yr from the X-ray luminosity ( 3 × 10<SUP>29</SUP> 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<SUB>☉</SUB>), making Roche-lobe overflow the likely accretion mechanism in this system. | URI: | http://hdl.handle.net/20.500.12386/27279 | URL: | https://www.aanda.org/articles/aa/abs/2017/02/aa30038-16/aa30038-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201630038 | Bibcode ADS: | 2017A&A...598L...6S | Fulltext: | open |
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