SIMBAD references

2007ApJ...671..616R - Astrophys. J., 671, 616-621 (2007/December-2)

EF Chamaeleontis: warm dust orbiting a nearby 10 myr old star.


Abstract (from CDS):

Most Vega-like stars have far-infrared excess (60 µm or longward in IRAS, ISO, or Spitzer MIPS bands) and contain cold dust (≲150 K) analogous to the Sun's Kuiper Belt region. However, dust in a region more akin to our asteroid belt and thus relevant to the terrestrial planet building process is warm and produces excess emission in mid-infrared wavelengths. By cross-correlating Hipparcos dwarfs with the MSX catalog, we found that EF Cha, a member of the recently identified, ∼10 Myr old, ``Cha-Near'' moving group, possesses prominent mid-infrared excess. N-band spectroscopy reveals a strong emission feature characterized by a mixture of small, warm, amorphous, and possibly crystalline silicate grains. Survival time of warm dust grains around this A9 star is ≲105 yr, much less than the age of the star. Thus, grains in this extrasolar terrestrial planetary zone must be of a ``second generation'' and not a remnant of primordial dust and are suggestive of substantial planet formation activity. Such second generation warm excess occurs around ∼13% of the early-type stars in nearby young stellar associations.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Infrared: Stars - Stars: Planetary Systems: Protoplanetary Disks - stars: individual (EF Chamaeleontis)

Simbad objects: 34

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