منابع مشابه
Debris Disks around Nearby Stars with Circumstellar Gas
We conducted a survey for infrared excess emission from 16 nearby main sequence shell stars using the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. Shell stars are early-type stars with narrow absorption lines in their spectra that appear to arise from circumstellar (CS) gas. Four of the 16 stars in our survey showed excess emission at 24 μm and 70 μm character...
متن کاملSteady-state Evolution of Debris Disks around a Stars
In this paper a simple analytical model for the steady-state evolution of debris disks due to collisions is confronted with Spitzer observations of dust around main sequence A stars. All stars are assumed to have planetesimal belts with a distribution of initial masses and radii. In the model disk mass is constant until the largest planetesimals reach collisional equilibrium whereupon the mass ...
متن کاملHyperaccretion Disks around Neutron Stars
It is usually proposed that hyperaccretion disks surrounding stellar-mass black holes at an accretion rate of a fraction of one solar mass per second, which are produced during the mergers of double compact stars or the collapses of massive stars, are central engines of gamma-ray bursts (GRBs). In some origin/afterglow models, however, newborn compact objects are invoked to be neutron stars rat...
متن کاملDebris Disk Evolution around a Stars
We report 24 and/or 70 μm measurements of ∼160 A-type main-sequence stars using the Multiband Imaging Photometer for Spitzer (MIPS). Their ages range from 5 to 850 Myr based on estimates from the literature (cluster or moving group associations) or from the H-R diagram and isochrones. The thermal infrared excess is identified by comparing the deviation (∼3% and ∼15% at the 1-σ level at 24 and 7...
متن کاملResolved Millimeter-wavelength Observations of Debris Disks around Sun-like Stars
The presence of debris disks around young main sequence stars hints at the existence and structure of hidden planetary systems. Spatially resolved observations are crucial to characterize the structure of the dust disk. The FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy survey of nearby young solar analogues yielded a sample of five debris disk-hosting stars with millimeter ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/525514