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

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Vos, Joris, Pelisoli, Ingrid, Budaj, Jan, Reindl, Nicole, Schaffenroth, Veronika, Bobrick, Alexey, Geier, Stephan, Hermes, JJ, Nemeth, Peter, Østensen, Roy H., Reding, Joshua S., Uzundag, Murat and Vučković, Maja (2021) Looking into the cradle of the grave : J22564–5910, a potential young post-merger hot subdwarf. Astronomy & Astrophysics, 655 . A43. doi:10.1051/0004-6361/202140391

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Official URL: http://dx.doi.org/10.1051/0004-6361/202140391

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Abstract

Context. 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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Double stars , Double stars -- Evolution , Circumstellar matter , Cosmic magnetic fields
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: 2021
Dates:
DateEvent
2021Published
11 November 2021Available
5 June 2021Accepted
Volume: 655
Article Number: A43
DOI: 10.1051/0004-6361/202140391
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDAlexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/100005156
GE2506/12-1[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
2/0031/18 Vedecká Grantová Agentúra MŠVVaŠ SR a SAVUNSPECIFIED
APVV-20-0148Agentúra na Podporu Výskumu a Vývoja UNSPECIFIED
GE 2506/9-1 [DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
21190886 [CONICYT] Comisión Nacional de Investigación Científica y Tecnológicahttp://dx.doi.org/10.13039/501100002848
studentshipEuropean Southern Observatoryhttp://dx.doi.org/10.13039/501100004604

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