Detection of spin-modulated circular polarisation and radial velocity variations in the long period Intermediate Polar 1RXS J080114.6-462324
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| Format: | Preprint |
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2025
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| author | Moloi, V. Potter, S. B. Khangale, Z. N. Buckley, D. A. H. Booi, L. Woudt, P. A. |
| author_facet | Moloi, V. Potter, S. B. Khangale, Z. N. Buckley, D. A. H. Booi, L. Woudt, P. A. |
| contents | We present a comprehensive photometric, spectroscopic, and polarimetric study of the intermediate polar (IP) 1RXS J080114.6-462324, using observations from the South African Astronomical Observatory (SAAO) 1.0-m and 1.9-m telescopes and the Southern African Large Telescope (SALT), complemented by archival TESS photometry. Photometric and photo-polarimetric data reveal a coherent modulation at the white dwarf (WD) spin period. TESS confirms periodicities of 1307.517 s (spin) and 11.803 h (orbital). Photopolarimetric and circular spectropolarimetric measurements show circular polarisation reaching ~+5%, modulated with the WD spin period, consistent with cyclotron emission from an accreting magnetic pole. Time-resolved optical spectra display prominent Balmer (H$γ$, H$β$, and H$α$) and He\textsc{ii} $λ$4686 emission features and additional He\textsc{i} emissions, all exhibiting minimal radial-velocity variations. We detect red-shifted absorption dips adjacent to the He\textsc{ii} and H$β$ lines, modulated at the WD spin period; periodogram analysis of the emission lines also yields spin modulation. These observations indicate that the system is a disc-fed, low-inclination IP. The combination of circular polarisation and spin-modulated absorption by infalling accretion curtain material supports this classification. Its comparatively long orbital period among IPs and the detection of polarised emission render 1RXS J080114.6-462324 an appealing candidate for evolutionary studies, potentially offering insight into how magnetic accretion systems evolve toward synchronism at longer orbital periods. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_14682 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detection of spin-modulated circular polarisation and radial velocity variations in the long period Intermediate Polar 1RXS J080114.6-462324 Moloi, V. Potter, S. B. Khangale, Z. N. Buckley, D. A. H. Booi, L. Woudt, P. A. Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics We present a comprehensive photometric, spectroscopic, and polarimetric study of the intermediate polar (IP) 1RXS J080114.6-462324, using observations from the South African Astronomical Observatory (SAAO) 1.0-m and 1.9-m telescopes and the Southern African Large Telescope (SALT), complemented by archival TESS photometry. Photometric and photo-polarimetric data reveal a coherent modulation at the white dwarf (WD) spin period. TESS confirms periodicities of 1307.517 s (spin) and 11.803 h (orbital). Photopolarimetric and circular spectropolarimetric measurements show circular polarisation reaching ~+5%, modulated with the WD spin period, consistent with cyclotron emission from an accreting magnetic pole. Time-resolved optical spectra display prominent Balmer (H$γ$, H$β$, and H$α$) and He\textsc{ii} $λ$4686 emission features and additional He\textsc{i} emissions, all exhibiting minimal radial-velocity variations. We detect red-shifted absorption dips adjacent to the He\textsc{ii} and H$β$ lines, modulated at the WD spin period; periodogram analysis of the emission lines also yields spin modulation. These observations indicate that the system is a disc-fed, low-inclination IP. The combination of circular polarisation and spin-modulated absorption by infalling accretion curtain material supports this classification. Its comparatively long orbital period among IPs and the detection of polarised emission render 1RXS J080114.6-462324 an appealing candidate for evolutionary studies, potentially offering insight into how magnetic accretion systems evolve toward synchronism at longer orbital periods. |
| title | Detection of spin-modulated circular polarisation and radial velocity variations in the long period Intermediate Polar 1RXS J080114.6-462324 |
| topic | Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2510.14682 |