Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20912706r&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #127.06; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The canonical debris disk β Pictoris was classified as a “shell star” long before it was known to be a young planetary system harboring evaporating and colliding planetesimals (Slettebak 1975). Shell stars have narrow absorption lines in their spectra, indicating the presence of circumstellar (CS) gas. It has turned out that some main sequence shell stars are also surrounded by CS dust disks, and are actually protoplanetary or debris disk systems.
The percentage of main sequence shell stars that have protoplanetary or debris disks is not known, but it appears to be at least 22%. We executed a Spitzer MIPS photometric survey of 16 main sequence shell stars to determine if they have infrared excess emission associated with CS dust. Preliminary analysis shows that four of them have significant excess emission at both 24 and 70 μm. If these stars have protoplanetary or debris disks, like β Pictoris, they will be part of a rare and valuable set ideal for studying the co-evolution of dust and gas throughout the planet formation phase.
Roberge Aki
Weinberger Alycia J.
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