MarketWISE J080822.18−644357.3
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WISE J080822.18−644357.3

WISE J080822.18-644357.3, also called J0808, is a 45+11−7 Myr old star system in the constellation Volans with a circumstellar debris disk orbiting an M-type red dwarf about 331 lightyears from Earth.

Debris disk
The fitting of a modeled disk with the Spectral Energy Distribution of J0808 indicates a disk temperature of about 263 K (-10 °C or 14 °F). The follow-up study found that a single disk had a poor match with the 22 μm data. The researchers found a better match with a "warm" outer disk with a temperature of about 240 K (-33 °C or -28 °F) and a "hot" inner disk with a temperature of about 1100 K (827 °C or 1520 °F). The warm outer disk is located around 0.115 au and the hot inner disk is located around 0.0056 au. The hot inner disk is likely the source of accreted material. The temperature of the inner disk is comparable to temperatures where amorphous silicates anneal into crystalline form. The inner disk also lies near the Roche limit of the red dwarf and therefore the inner disk could be the result of disrupted planetesimals. The warm outer disk could be similar to dust belts seen around B- to K-type stars, which have temperatures around 190 K and which likely represent small dust grains of sublimating ice from icy planetesimals. ALMA detected a third component with a temperature of 20 K (-253 °C or -424 °F). Using this temperature the researchers were able to estimate the dust mass to 0.057±0.006 . This is higher than the disk mass around ~20 Myr old AU Microscopii and the ~50 Myr old GJ 182, but smaller than the ~10 Myr old TWA 7. The disk has a radius smaller than 16 au. The missing CO detection is explained with two possible scenarios: Either dust grains are released in a collisional cascade induced by the collisions of km-sized planetesimals or a recent collision of planetary bodies generated a large amount of small dust grains. A light curve from CTIO shows variations, which could be disk material blocking light from the star. The TESS light curve shows aperiodic dipping on timescales of 0.5–2 days. == Peter Pan disks ==
Peter Pan disks
Other stars and brown dwarfs were discovered to be similar to J0808, with signs of youth while being in an older moving group. Together with J0808, these older low-mass accretors in nearby moving groups are being called Peter Pan disks. ==Gallery==
Gallery
Peter Pan Disk (SED).png|Spectral Energy Distribution (SED) of J0808 (from Disk Detective talk page) == See also ==
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