Swift/XRT observations of superorbital modulations in wind-fed supergiant X-ray binaries
| dc.contributor.author | Romano, P | |
| dc.contributor.author | Bozzo, E | |
| dc.contributor.author | Islam, Nazma | |
| dc.contributor.author | Corbet, R H D | |
| dc.date.accessioned | 2024-01-12T13:12:41Z | |
| dc.date.available | 2024-01-12T13:12:41Z | |
| dc.date.issued | 2023-12-26 | |
| dc.description.abstract | We present the first Swift/XRT long-term monitoring of 2S 0114+650, a wind-fed supergiant X-ray binary for which both orbital and superorbital periods are known (Pₒᵣb ∼ 11.6 d and Pₛᵤₚ ∼ 30.8 d). Our campaign, summing up to ∼79 ks, is the most intense and complete sampling of the X-ray light curve of this source with a sensitive pointed X-ray instrument, and covers 17 orbital, and 6 superorbital cycles. The combination of flexibility, sensitivity, and soft X-ray coverage of the X-ray telescope (XRT) allowed us to confirm previously reported spectral changes along the orbital cycle of the source and unveil the variability in its spectral parameters as a function of the superorbital phase. For completeness, we also report on a similar analysis carried out by exploiting XRT archival data on three additional wind-fed supergiant X-ray binaries IGR J16418−4532, IGR J16479−4514, and IGR J16493−4348. For these sources, the archival data provided coverage along several superorbital cycles but our analysis could not reveal any significant spectral variability. | |
| dc.description.sponsorship | We acknowledge unwavering support from Amos. We also thank the anonymous referee for comments that helped improve the paper. We acknowledge financial contribution from contracts ASI-INAF I/037/12/0 and ASI-INAF n. 2017-14-H.0. NI acknowledges support from NASA grants 80NSSC21K0022 and 80NSSC21K1994. This work was supported in part by NASA under award number 80GSFC21M0002. The Swift data of our monitoring campaigns on 2S 0114+650, on IGR J16493−4348 and (partially) IGR J16418−4532 were obtained through contract ASI-INAF I/004/11/0 to ASI-INAF I/004/11/5. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester (see Evans et al. 2007, 2009). Happy 18th, Swift. | |
| dc.description.uri | https://academic.oup.com/mnras/article/527/4/10993/7499728 | |
| dc.format.extent | 17 pages | |
| dc.genre | journal articles | |
| dc.genre | preprints | |
| dc.identifier.citation | Romano, P, E Bozzo, N Islam, and R H D Corbet. “Swift/XRT Observations of Superorbital Modulations in Wind-Fed Supergiant X-Ray Binaries.” Monthly Notices of the Royal Astronomical Society, December 26, 2023, stad3878. https://doi.org/10.1093/mnras/stad3878. | |
| dc.identifier.uri | https://doi.org/10.1093/mnras/stad3878 | |
| dc.identifier.uri | http://hdl.handle.net/11603/31276 | |
| dc.language.iso | en_US | |
| dc.publisher | Oxford University Press | |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press. | |
| dc.title | Swift/XRT observations of superorbital modulations in wind-fed supergiant X-ray binaries | |
| dc.type | Text | |
| dcterms.creator | https://orcid.org/0000-0002-2413-9301 |