2015ApJ...799...16Z -
Astrophys. J., 799, 16 (2015/January-3)
Accreting circumplanetary disks: observational signatures.
ZHU Z.
Abstract (from CDS):
I calculate the spectral energy distributions of accreting circumplanetary disks using atmospheric radiative transfer models. Circumplanetary disks only accreting at 10–10 M☉/yr around a 1 MJ planet can be brighter than the planet itself. A moderately accreting circumplanetary disk ({dot}M ∼ 10–8 M☉/yr; enough to form a 10 MJplanet within 1 Myr) around a 1 MJplanet has a maximum temperature of ∼2000 K, and at near-infrared wavelengths (J, H, K bands), this disk is as bright as a late-M-type brown dwarf or a 10 MJplanet with a "hot start." To use direct imaging to find the accretion disks around low-mass planets (e.g., 1 MJ) and distinguish them from brown dwarfs or hot high-mass planets, it is crucial to obtain photometry at mid-infrared bands (L', M, N bands) because the emission from circumplanetary disks falls off more slowly toward longer wavelengths than those of brown dwarfs or planets. If young planets have strong magnetic fields ( ≳ 100 G), fields may truncate slowly accreting circumplanetary disks ({dot}M ≲ 10–9 M☉/yr) and lead to magnetospheric accretion, which can provide additional accretion signatures, such as UV/optical excess from the accretion shock and line emission.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - planetary systems - planets and satellites: formation - protoplanetary disks - radiative transfer - stars: magnetic field - stars: pre-main sequence
Simbad objects:
4
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