SIMBAD references

2011ApJ...726...72W - Astrophys. J., 726, 72 (2011/January-2)

The absence of cold dust and the mineralogy and origin of the warm dust encircling BD +20 307.


Abstract (from CDS):

Spitzer Space Telescope photometry and spectroscopy of BD +20 307 show that all of the dust around this remarkable Gyr-old spectroscopic binary arises within 1 AU. No additional cold dust is needed to fit the infrared excess. Peaks in the 10 and 20 µm spectrum are well fit with small silicates that should be removed on a timescale of years from the system. This is the dustiest star known for its age, which is ≳ 1 Gyr. The dust cannot arise from a steady-state collisional cascade. A catastrophic collision of two rocky, planetary-scale bodies in the terrestrial zone is the most likely source for this warm dust because it does not require a reservoir of planetesimals in the outer system.

Abstract Copyright:

Journal keyword(s): circumstellar matter - planet-disk interactions - stars: individual: BD+20 307

Simbad objects: 8

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