ProjektAccretion Disks around Massive Protostars
Grunddaten
Titel:
Accretion Disks around Massive Protostars
Laufzeit:
01.10.2018 bis 30.09.2022
Abstract / Kurz- beschreibung:
Observations indicate a clear trend of increasing multiplicity with increasing mass of the primary star. Additional to visual companions, many massive stars are surrounded by short-period spectroscopic binaries. Orbital periods shorter than a few days are not uncommon.
Nonetheless, the formation mechanism of close massive binary stars are unknown. Both stars might form independently of each other and get together later on in a capturing event. But the high frequency of close pairs with components of similar mass argues in favor of a multiplicity originating from the formation process rather than from a tidal capture in a dense cluster.
In a classical static disk fragmentation analysis, gravitational instabilities at these small radii are suppressed due to the hot temperature and fast Keplerian ro- tation of the inner disk. But our previous dynamical studies of disk formation around high-mass stars suggest a strong increase of the fragmentation probability behind the dust sublimation front of the massive accretion disk. Shadowed cool regions behind the dust sublimation radius might represent the birth place of close companions with a semi-major axis of a few up to 100 au. Furthermore, migration of the secondary star due to its interaction with the accretion disk would explain short-period, spectroscopic binaries with sub-AU semi-major axes.
The proposed project targets at direct numerical modeling of the formation and evolution of massive accretion disks with a focus on gravitational instabilities behind the dust sublimation front.
Nonetheless, the formation mechanism of close massive binary stars are unknown. Both stars might form independently of each other and get together later on in a capturing event. But the high frequency of close pairs with components of similar mass argues in favor of a multiplicity originating from the formation process rather than from a tidal capture in a dense cluster.
In a classical static disk fragmentation analysis, gravitational instabilities at these small radii are suppressed due to the hot temperature and fast Keplerian ro- tation of the inner disk. But our previous dynamical studies of disk formation around high-mass stars suggest a strong increase of the fragmentation probability behind the dust sublimation front of the massive accretion disk. Shadowed cool regions behind the dust sublimation radius might represent the birth place of close companions with a semi-major axis of a few up to 100 au. Furthermore, migration of the secondary star due to its interaction with the accretion disk would explain short-period, spectroscopic binaries with sub-AU semi-major axes.
The proposed project targets at direct numerical modeling of the formation and evolution of massive accretion disks with a focus on gravitational instabilities behind the dust sublimation front.
Beteiligte Mitarbeiter/innen
Leiter/innen
Institut für Astronomie und Astrophysik (IAAT)
Fachbereich Physik, Mathematisch-Naturwissenschaftliche Fakultät
Fachbereich Physik, Mathematisch-Naturwissenschaftliche Fakultät
Ansprechpartner/innen
Institut für Astronomie und Astrophysik (IAAT)
Fachbereich Physik, Mathematisch-Naturwissenschaftliche Fakultät
Fachbereich Physik, Mathematisch-Naturwissenschaftliche Fakultät
SFB-TR 7 - Gravitationswellenastronomie
Sonderforschungsbereiche und Transregios
Sonderforschungsbereiche und Transregios
Weitere Mitarbeiter/innen
Oliva Mercado, Guillermo Andree
Institut für Astronomie und Astrophysik (IAAT)
Fachbereich Physik, Mathematisch-Naturwissenschaftliche Fakultät
Fachbereich Physik, Mathematisch-Naturwissenschaftliche Fakultät
Lokale Einrichtungen
Institut für Astronomie und Astrophysik (IAAT)
Fachbereich Physik
Mathematisch-Naturwissenschaftliche Fakultät
Mathematisch-Naturwissenschaftliche Fakultät
Geldgeber
Bonn, Nordrhein-Westfalen, Deutschland
Bonn, Nordrhein-Westfalen, Deutschland