Farihi, J;
Burleigh, MR;
Hoard, DW;
(2008)
A near-infrared spectroscopic study of the accreting magnetic white dwarf SDSS J121209.31+013627.7 and its substellar companion.
Astrophysical Journal
, 674
(1)
pp. 421-430.
10.1086/524933.
Preview |
Text
Farihi_72765.web.pdf - Published Version Download (431kB) | Preview |
Abstract
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 Ha, and the 1-2.5 μm spectral data presented here are consistent with the presence of a late L or early T dwarf. The excess flux seen beyond 1.5 μm 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.
| Type: | Article |
|---|---|
| Title: | A near-infrared spectroscopic study of the accreting magnetic white dwarf SDSS J121209.31+013627.7 and its substellar companion |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1086/524933 |
| Publisher version: | http://dx.doi.org/10.1086/524933 |
| Language: | English |
| Additional information: | Copyright © 2008. The American Astronomical Society. All rights reserved. |
| Keywords: | binaries: close; infrared: stars; novae, cataclysmic variables; stars: evolution; stars: formation; stars: fundamental parameters; stars: individual (SDSS J121209.31+013627.7) ; stars: low-mass, brown dwarfs; white dwarfs |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1477403 |
Archive Staff Only
 |
View Item |
