Planet around BP Psc?

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Planet around BP Psc?

Post by Edasich on 11th August 2010, 5:18 am

A well-known young K giant star with circumstellar disk, now supposed to host a planetary companion (<10 Mj) within 4 AUs.

Shocks and a Giant Planet in the Disk Orbiting BP Piscium?

Spitzer IRS spectroscopy supports the interpretation that BP Piscium, a gas and dust enshrouded star residing at high Galactic latitude, is a first-ascent giant rather than a classical T Tauri star. Our analysis suggests that BP Piscium's spectral energy distribution can be modeled as a disk with a gap that is opened by a giant planet. Modeling the rich mid-infrared emission line spectrum indicates that the solid-state emitting grains orbiting BP Piscium are primarily composed of ~75 K crystalline, magnesium-rich olivine; ~75 K crystalline, magnesium-rich pyroxene; ~200 K amorphous, magnesium-rich pyroxene; and ~200 K annealed silica ('cristobalite'). These dust grains are all sub-micron sized. The giant planet and gap model also naturally explains the location and mineralogy of the small dust grains in the disk. Disk shocks that result from disk-planet interaction generate the highly crystalline dust which is subsequently blown out of the disk mid-plane and into the disk atmosphere.
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Re: Planet around BP Psc?

Post by Lazarus on 11th August 2010, 2:18 pm

BP Piscium is definitely an odd one: an evolved star mimicking a T Tauri star. Opens up the question of just how common such a scenario is. A planet would just raise more puzzles: as it states in the paper, it is unclear whether it would be an original planet or a second-generation planet formed out of the giant star's disc.
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Re: Planet around BP Psc?

Post by Stalker on 11th August 2010, 3:45 pm

I read that this star is special because of a recent collision... Can HR8799's system born a similar process?

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