The Evolutionary State of Anemic Circumstellar Disks in IC 348: Transitions Disks, The Earliest Debris Disks, and Terrestrial Planet Formation

Details The Evolutionary State of Anemic Circumstellar Disks in IC 348: Transitions Disks, The Earliest Debris Disks, and Terrestrial Planet Formation The Evolutionary State of Anemic Circumstellar Disks in IC 348: Transitions Disks, The Earliest Debris Disks, and Terrestrial Planet Formation

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0902c&link_type=abstract

American Astronomical Society, AAS Meeting #212, #9.02; Bulletin of the American Astronomical Society, Vol. 40, p.200

Astronomy and Astrophysics

Astronomy

Scientific paper

I investigate the evolution of 3 Myr-old MIPS-detected circumstellar disks in IC 348 that may be in an intermediate stage between primordial, optically-thick disks of gas/dust and debris disks characteristic of the final stages of planet formation. I demonstrate that these anemic disks are not a homogenous class of objects corresponding to a unique evolutionary state. Analysis of their mid-IR colors, accretion signatures (or lack thereof), and SED modeling suggest that such disks around early spectral type stars are most likely warm debris disks indicative of terrestrial planet formation: perhaps the youngest yet known. MIPS-detected anemic disks around later (M) stars are likely evolved primordial disks such as transition disks. Anemic disks surrounding G and K stars contain both populations. IC 348 also contains a small number of non-accreting sources with weak 24 micron emission characteristic of cold debris disks. The difference in evolutionary states between anemic disks surrounding early type vs. late-type stars is consistent with a mass-dependent evolution of circumstellar disks from the primordial disk phase through the debris disk phase similar to that found for 5 Myr-old Upper Scorpius.

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