The Decay of Accreting Triple Systems as Brown Dwarf Formation Scenario
نویسندگان
چکیده
We investigate the dynamical decay of non-hierarchical accreting triple systems and its implications on the ejection model as Brown Dwarf formation scenario. A modified chain-regularization scheme is used to integrate the equations of motion, that also allows for mass changes over time as well as for momentum transfer from the accreted gas mass onto the bodies. We integrate an ensemble of triple systems within a certain volume with different accretion rates, assuming several prescriptions
منابع مشابه
Evidence for Accretion in a Nearby, Young Brown Dwarf
We report on the discovery of the young, nearby, brown dwarf 2MASS J0041353−562112. The object has a spectral type of M7.5, it shows Li absorption and signatures of accretion, which implies that it still has a disk and suggests an age below 10Myr. The space motion vector and position on the sky indicate that the brown dwarf is probably a member of the ∼20Myr old Tuc-Hor association, or that it ...
متن کاملMagnetic Field Evolution in Accreting White Dwarfs
We discuss the evolution of the magnetic field of an accreting white dwarf. We calculate the ohmic decay modes for accreting white dwarfs, whose interiors are maintained in a liquid state by compressional heating. We show that the lowest order ohmic decay time is (8–12) billion years for a dipole field, and (4–6) billion years for a quadrupole field. We then compare the timescales for ohmic dif...
متن کاملBrown Dwarf Binaries from Disintegrating Triple Systems
Binaries in which both components are brown dwarfs (BDs) are being discovered at an increasing rate, and their properties may hold clues to their origin. We have carried out 200,000 N-body simulations of three identical stellar embryos with masses drawn from a Chabrier IMF and embedded in a molecular core. The bodies are initially non-hierarchical and undergo chaotic motions within the cloud co...
متن کاملThe Formation of Brown Dwarfs as Ejected Stellar Embryos
We conjecture that brown dwarfs are substellar objects because they have been ejected from small newborn multiple systems which have decayed in dynamical interactions. In this view, brown dwarfs are stellar embryos for which the star formation process was aborted before the hydrostatic cores could build up enough mass to eventually start hydrogen burning. The disintegration of a small multiple ...
متن کاملChapter 1 Searching for Brown Dwarf Outflows
As outflow activity in low mass protostars is strongly connected to accretion it is reasonable to expect accreting brown dwarfs to also be driving outflows. In the last three years we have searched for brown dwarf outflows using high quality optical spectra obtained with UVES on the VLT and the technique of spectro-astrometry. To date five brown dwarf outflows have been discovered. Here the met...
متن کامل