Multipolar magnetic configuration: A trace of post-mergers events in circumstellar disks around FS CMa stars
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F25%3AA0000457" target="_blank" >RIV/47813059:19630/25:A0000457 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/25:10510252
Result on the web
<a href="https://www.aanda.org/articles/aa/full_html/2025/11/aa53958-25/aa53958-25.html" target="_blank" >https://www.aanda.org/articles/aa/full_html/2025/11/aa53958-25/aa53958-25.html</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202553958" target="_blank" >10.1051/0004-6361/202553958</a>
Alternative languages
Result language
angličtina
Original language name
Multipolar magnetic configuration: A trace of post-mergers events in circumstellar disks around FS CMa stars
Original language description
Context. Observations suggest that the magnetic fields of disk-bearing stars can have non-dipolar configurations. However, the influence of these configurations on magnetospheric accretion remains poorly understood. Aims. We aim to simulate magnetospheric accretion by incorporating non-dipolar and strong magnetic field. Our model is informed by observations of IRAS 17449+2320, a post-merger belonging to the group of FS CMa stars, which indicate a dominant dipolar magnetic field with an additional quadrupole component. Methods. Using the PLUTO code, we conducted 2.5-D nonideal viscous-resistive (alpha(nu) = 1 and alpha(m )= 1) magnetohydrodynamic simulations of star-disk magnetospheric interactions. We considered a thin accretion disk and a strong stellar magnetic field (B-star = 6.2 kG) under four configurations: pure dipole, pure quadrupole, dipole plus quadrupole, and dipole plus octupole. In the latter two cases, different magnetic polar strength ratios were explored. Results. For asymmetric magnetic field configurations, we find that accretion exhibits funnel streams below the midplane, indicating the dominance of the quadrupolar and octupolar components. In contrast, in dipolar configurations, we observe the formation of two symmetrical funnels with respect to the midplane. However, in the quadrupolar configuration, accretion is entirely confined to the disk midplane forming a cone-like pattern that leads to disk widening. Remarkably, the presence of a quadrupolar component gives rise to highly asymmetric substructures in the corona region. Conclusions. Multipolar stellar magnetic fields drive nonuniform accretion and lead to asymmetric density distributions in both the disk and corona. These results resemble observed features of some FS CMa post-mergers and Herbig Ae/Be stars, highlighting the critical role of magnetic field complexity in shaping circumstellar environments.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ASTRONOMY & ASTROPHYSICS
ISSN
0004-6361
e-ISSN
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Volume of the periodical
703
Issue of the periodical within the volume
October 25
Country of publishing house
FR - FRANCE
Number of pages
11
Pages from-to
„703-1“-„703-11“
UT code for WoS article
001606951900010
EID of the result in the Scopus database
2-s2.0-105021109243