XMM-Newton follow-up of two eROSITA X-ray binary candidates
Avakyan A, Zainab A, Doroshenko V, Wilms J, Schwope A, Suleimanov V, Buckley D, Brink J, Santangelo A (2025)
Publication Language: English
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 60
Article Number: 6
Journal Issue: 1
DOI: 10.1007/s10686-025-10016-w
Abstract
We report on the follow-up observations with XMM-Newton of two X-ray binary candidates identified in the first eROSITA all-sky survey data (eRASS1), 1eRASS J061330.8160440 and 1eRASS J161201.9−464622. Based on the obtained results, in particular, the observed X-ray spectra and lack of pulsations, as well as properties of the identified optical counterparts, we conclude that both candidates are unlikely to be XRBs. Based on LAMOST optical spectroscopy and SED fit results for 1eRASS J061330.8160440 we classify it as an M0 chromospherically active subgiant star. ZTF and TESS photometry reveal highly significant period for this object of 7.189 days, which likely attributed to starspot(s). On the other hand, SALT follow-up spectroscopy of 1eRASS J161201.9−464622 solidly classifies this source as a bright novalike cataclysmic variable (CV), the second discovered with eROSITA. A persistent 4.802 h signal is found across all three available TESS observations, and is tentatively identified as the orbital period of the binary. Follow-up high-speed photometry and time-resolved spectroscopy are required to confirm the derived orbital modulation.
Authors with CRIS profile
Involved external institutions
Eberhard Karls Universität Tübingen
Germany (DE)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
University of Cape Town (UCT)
South Africa (ZA)
Germany (DE)
Leibniz Institute for Astrophysics Potsdam / Leibniz-Institut für Astrophysik Potsdam
Germany (DE)
University of Cape Town (UCT)
South Africa (ZA)
How to cite
APA:
Avakyan, A., Zainab, A., Doroshenko, V., Wilms, J., Schwope, A., Suleimanov, V.,... Santangelo, A. (2025). XMM-Newton follow-up of two eROSITA X-ray binary candidates. Experimental Astronomy, 60(1). https://doi.org/10.1007/s10686-025-10016-w
MLA:
Avakyan, A., et al. "XMM-Newton follow-up of two eROSITA X-ray binary candidates." Experimental Astronomy 60.1 (2025).
BibTeX: Download