ASpitzerStudy of Dusty Disks around Nearby, Young Stars | Zendy

C. H. Chen | Zendy; B. M. Patten | Zendy; M. W. Werner | Zendy; C. D. Dowell | Zendy; Karl R. Stapelfeldt | Zendy; Inseok Song | Zendy; J. R. Stauffer | Zendy; Myra Blaylock | Zendy; Karl D. Gordon | Zendy; Vanessa Krause | Zendy

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ASpitzerStudy of Dusty Disks around Nearby, Young Stars

Author(s) -

C. H. Chen,

B. M. Patten,

M. W. Werner,

C. D. Dowell,

Karl R. Stapelfeldt,

Inseok Song,

J. R. Stauffer,

Myra Blaylock,

Karl D. Gordon,

Vanessa Krause

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/497124

Subject(s) - physics , spitzer space telescope , astrophysics , stars , photosphere , astronomy , photometry (optics) , photometer , infrared , spectral line

We have obtained Spitzer Space Telescope MIPS (Multiband Imaging Photometer for Spitzer) observations of 39A-throughM-typedwarfs,withestimatedagesbetween12and600Myr;IRACobservationsforasubsetof11stars; and follow-up CSO SHARC II350 m observationsfor a subsetof two stars.Noneofthe objects observedwithIRAC possess infrared excesses at 3.6-8.0 m; however, seven objects observed with MIPS possess 24 and/or 70 m excesses. Four objects ( Phe, HD 92945, HD 119124, and AU Mic), with estimated ages 12-200 Myr, possess strong70 mexcesses, 100%largerthantheirpredictedphotospheres,andno24 mexcesses,suggestingthatthe dust grains in these systems are cold. One object (HD 112429) possesses moderate 24 and 70 m excesses with a colortemperature,Tgr ¼ 100K.Twoobjects( 1LibandHD177724)possesssuchstrong24 mexcessesthattheir 12, 24, and 70 m fluxes cannot be self-consistently modeled using a modified blackbody despite a 70 m excess >2 times greater than the photosphere around 1 Lib. The strong 24 m excesses may be the result of emission in

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