Looking into the cradle of the grave: J22564-5910, a young post-merger hot subdwarf?

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dc.contributor.authorVos, Joris
dc.contributor.authorPelisoli, Ingrid
dc.contributor.authorBudaj, Jan
dc.contributor.authorReindl, Nicole
dc.contributor.authorSchaffenroth, Veronika
dc.contributor.authorBobrick, Alexey
dc.contributor.authorGeier, Stephan
dc.contributor.authorHermes, Jj
dc.contributor.authorNemeth, Peter
dc.contributor.authorØstensen, Roy
dc.contributor.authorReding, Joshua S.
dc.contributor.authorUzundag, Murat
dc.contributor.authorVučković, Maja
dc.date.accessioned2022-11-30T02:47:09Z
dc.date.available2022-11-30T02:47:09Z
dc.date.issued2021
dc.description.abstractContext. We present the discovery of J22564–5910, a new type of hot subdwarf (sdB) which shows evidence of gas present in the system and it has shallow, multi-peaked hydrogen and helium lines which vary in shape over time. All observational evidence points towards J22564–5910 being observed very shortly after the merger phase that formed it. Aims. Using high-resolution, high signal-to-noise spectroscopy, combined with multi-band photometry, Gaia astrometry, and TESS light curves, we aim to interpret these unusual spectral features. Methods. The photometry, spectra, and light curves were all analysed, and their results were combined in order to support our interpretation of the observations: the likely presence of a magnetic field combined with gas features around the sdB. Based on the triple-peaked H lines, the magnetic field strength was estimated and, by using the SHELLSPEC code, qualitative models of gas configurations were fitted to the observations. Results. All observations can either be explained by a magnetic field of ∼650 kG, which enables the formation of a centrifugal magnetosphere, or a non-magnetic hot subdwarf surrounded by a circumstellar gas disc or torus. Both scenarios are not mutually exclusive and both can be explained by a recent merger. Conclusions. J22564–5910 is the first object of its kind. It is a rapidly spinning sdB with gas still present in the system. It is the first post-merger star observed this early after the merger event, and as such it is very valuable system to test merger theories. If the magnetic field can be confirmed, it is not only the first magnetic sdB, but it hosts the strongest magnetic field ever found in a pre-white dwarf object. Thus, it could represent the long sought-after immediate ancestor of strongly magnetic white dwarfs.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameVos_Loo2021.pdf
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202140391
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7586
dc.languageen
dc.publisherEuropean Southern Observatory (ESO)
dc.rights© ESO 2021
dc.sourceAstronomy & Astrophysics
dc.subjectBINARIES:GENERALen_ES
dc.subjectCIRCUMSTELLAR MATTERen_ES
dc.subjectSTARS: EVOLUTIONen_ES
dc.subjectSTARS: MAGNETIC FIELDen_ES
dc.subjectSUBDWARFSen_ES
dc.titleLooking into the cradle of the grave: J22564-5910, a young post-merger hot subdwarf?
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

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