24-micron Detections of Disks around Very Low-mass Stars and Brown Dwarfs in IC 348: Grain Growth/Settling and Inner Holes?

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dc.creatorMuzerolle, James
dc.creatorAdame, Lucia
dc.creatorD'Alessio, Paola
dc.creatorCalvet, Nuria
dc.creatorLuhman, Kevin
dc.creatorMuench, August
dc.creatorLada, Charles
dc.creatorRieke, George
dc.creatorSiegler, Nick
dc.creatorTrilling, David
dc.creatorYoung, Erick
dc.creatorAllen, Lori
dc.creatorHartmann, Lee
dc.creatorMegeath, S. Thomas
dc.date2006-03-03
dc.date.accessioned2026-07-07T07:00:58Z
dc.date.available2026-07-07T07:00:58Z
dc.descriptionWe present observations of six late-type members of the young cluster IC 348 detected at 24 microns with the Multiband Imaging Photometer for Spitzer(MIPS). At least four of the objects are probably substellar. Combining these data with ground-based optical and near-infrared photometry and complementary observations with the Infrared Array Camera (IRAC), we have modeled the spectral energy distributions using detailed models of irradiated accretion disks. We are able to fit the observations with models using a range of maximum grain sizes from ISM-type dust to grains as large as 1 millimeter. Two objects show a lack of excess emission at wavelengths shortward of 5.8-8 microns but significant excess at longer wavelengths, indicative of large optically thin or evacuated inner holes. Our models indicate a inner hole of radius ~ 0.5-0.9 AU for the brown dwarf L316; this is the first brown dwarf with evidence for an AU-scale inner disk hole. We examine several possible mechanisms for the inner disk clearing in this case, including photoevaporation and planet formation.
dc.description24 pages, 6 figures (one in PNG format). Accepted to ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0603104
dc.identifierhttp://arxiv.org/abs/astro-ph/0603104
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108143
dc.subjectAstrophysics
dc.title24-micron Detections of Disks around Very Low-mass Stars and Brown Dwarfs in IC 348: Grain Growth/Settling and Inner Holes?
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