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Title: ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES

Abstract

I calculate the spectral energy distributions of accreting circumplanetary disks using atmospheric radiative transfer models. Circumplanetary disks only accreting at 10{sup –10} M {sub ☉} yr{sup –1} around a 1 M{sub J} planet can be brighter than the planet itself. A moderately accreting circumplanetary disk ( M-dot ∼10{sup −8} M{sub ⊙} yr{sup −1}; enough to form a 10 M{sub J} planet within 1 Myr) around a 1 M{sub J} planet 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 M{sub J} planet with a ''hot start''. To use direct imaging to find the accretion disks around low-mass planets (e.g., 1 M{sub J} ) 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 ( M-dot ≲10{sup −9} M{sub ⊙} yr{sup −1}) and lead to magnetospheric accretion, which can provide additional accretion signatures, such asmore » UV/optical excess from the accretion shock and line emission.« less

Authors:
 [1]
  1. Department of Astrophysical Sciences, 4 Ivy Lane, Peyton Hall, Princeton University, Princeton, NJ 08544 (United States)
Publication Date:
OSTI Identifier:
22364556
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 799; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; ENERGY SPECTRA; MAGNETIC FIELDS; MASS; PHOTOMETRY; PLANETARY MAGNETOSPHERES; PLANETS; PROTOPLANETS; RADIANT HEAT TRANSFER; SATELLITES; STARS; WAVELENGTHS

Citation Formats

Zhu, Zhaohuan, E-mail: zhzhu@astro.princeton.edu. ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES. United States: N. p., 2015. Web. doi:10.1088/0004-637X/799/1/16.
Zhu, Zhaohuan, E-mail: zhzhu@astro.princeton.edu. ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES. United States. doi:10.1088/0004-637X/799/1/16.
Zhu, Zhaohuan, E-mail: zhzhu@astro.princeton.edu. Tue . "ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES". United States. doi:10.1088/0004-637X/799/1/16.
@article{osti_22364556,
title = {ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES},
author = {Zhu, Zhaohuan, E-mail: zhzhu@astro.princeton.edu},
abstractNote = {I calculate the spectral energy distributions of accreting circumplanetary disks using atmospheric radiative transfer models. Circumplanetary disks only accreting at 10{sup –10} M {sub ☉} yr{sup –1} around a 1 M{sub J} planet can be brighter than the planet itself. A moderately accreting circumplanetary disk ( M-dot ∼10{sup −8} M{sub ⊙} yr{sup −1}; enough to form a 10 M{sub J} planet within 1 Myr) around a 1 M{sub J} planet 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 M{sub J} planet with a ''hot start''. To use direct imaging to find the accretion disks around low-mass planets (e.g., 1 M{sub J} ) 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 ( M-dot ≲10{sup −9} M{sub ⊙} yr{sup −1}) and lead to magnetospheric accretion, which can provide additional accretion signatures, such as UV/optical excess from the accretion shock and line emission.},
doi = {10.1088/0004-637X/799/1/16},
journal = {Astrophysical Journal},
number = 1,
volume = 799,
place = {United States},
year = {Tue Jan 20 00:00:00 EST 2015},
month = {Tue Jan 20 00:00:00 EST 2015}
}