Debris Disks in NGC 2547

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dc.creatorGorlova, N.
dc.creatorBalog, Z.
dc.creatorRieke, G. H.
dc.creatorMuzerolle, J.
dc.creatorSu, K. Y. L.
dc.creatorIvanov, V. D.
dc.creatorYoung, E. T.
dc.date2007-07-19
dc.date2007-07-23
dc.date.accessioned2026-07-07T11:41:30Z
dc.date.available2026-07-07T11:41:30Z
dc.descriptionWe have surveyed the 30 Myr-old cluster NGC 2547 for planetary debris disks using Spitzer. At 4.5-8 um we are sensitive to the photospheric level down to mid-M stars (0.2 Msol) and at 24 um to early-G stars (1.2 Msol). We find only two to four stars with excesses at 8 um out of ~400-500 cluster members, resulting in an excess fraction <~1 percent at this wavelength. By contrast, the excess fraction at 24 um is ~40 percent (for B-F types). Out of four late-type stars with excesses at 8 um two marginal ones are consistent with asteroid-like debris disks. Among stars with strong 8 um excesses one is possibly from a transitional disk, while another one can be a result of a catastrophic collision. Our survey demonstrates that the inner 0.1-1 AU parts of disks around solar-type stars clear out very thoroughly by 30 Myrs of age. Comparing with the much slower decay of excesses at 24 and 70 um, disks clear from the inside out, of order 10 Myr for the inner zones probed at 8 um compared with a hundred or more Myr for those probed with the two longer wavelengths.
dc.descriptionAccepted to ApJ, 29 pages, 13 figs. A Note in Proof concerning cluster's age was added in the original submission of 2007 July 19. Full Tables 1 and 2 in the electronic form together with the article with full resolution figures are available at http://www.astro.ufl.edu/~ngorlova/disksNGC2547/
dc.identifierhttps://arxiv.org/abs/0707.2827
dc.identifierhttp://arxiv.org/abs/0707.2827
dc.identifierAstrophys.J.670:516-535,2007
dc.identifierdoi:10.1086/521671
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200559
dc.subjectAstrophysics
dc.titleDebris Disks in NGC 2547
dc.typetext

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