New Debris-Disk Candidates: 24 Micron Stellar Excesses at 100 Million years

Gorlova, Nadya, Padgett, Deborah L., Rieke, George H., Muzerolle, James, Morrison, Jane E., Gordon, Karl D., Engelbracht, Chad W., Hines, Dean C., Hinz, Joannah C., Noriega-Crespo, Alberto, Rebull, Luisa, Stansberry, John A., Stapelfeldt, Karl R., Su, Kate Y. L., & Young, Erick T.
2004, The Astrophysical Journal Supplement Series, 154, 448

Sixty-three members of the 100 Myr old open cluster M47 (NGC 2422) have been detected at 24 μm with the Spitzer Space Telescope. The Be star V 378 Pup shows an excess both in the near-infrared and at 24 μm (K-[24]=2.4 mag), probably due to free-free emission from the gaseous envelope. Seven other early-type stars show smaller excesses, K-[24]=0.6-0.9. Among late-type stars, two show large excesses: P922, a K1 V star with K-[24]=1.08+/-0.11, and P1121, an F9 V star with K-[24]=3.72+/-0.02. P1121 is the first known main-sequence star showing an excess comparable to that of β Pic, which may indicate the presence of an exceptionally massive debris disk. It is possible that a major planetesimal collision has occurred in this system, consistent with the few hundred Myr timescales estimated for the clearing of the solar system.


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