The incidence of debris disks at 24 μm and 670 Myr

Urban, Laurie E. and Rieke, George and Su, Kate and Trilling, David E (2012) The incidence of debris disks at 24 μm and 670 Myr. Astrophysical Journal, 750 (2). 1/12/2015. ISSN 1538-4357

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Abstract

We use Spitzer Space Telescope 24 µm data to search for debris disks among 122 AFGKMstars from the ~670 Myr clusters Hyades, Coma Ber, and Praesepe, utilizing a number of advances in data reduction and determining the intrinsic colors of main-sequence stars. For our sample, the 1σ dispersion about the main-sequence V - KS, KS-[24] locus is approximately 3.1%. We identify seven debris disks at 10% or more (≥3σ confidence level) above the expected KS-[24] for purely photospheric emission. The incidence of excesses of 10% or greater in our sample at this age is 5.7+3.1-1.7%. Combining with results from the literature, the rate is 7.8+4.2-2.1% for early-type (B9-F4) stars and 2.7+3.3-1.7% for solar-like (F5-K9) stars. Our primary sample has strict criteria for inclusion to allow comparison with other work; when we relax these criteria, three additional debris disks are detected. They are all around stars of solar-like type and hence reinforce our conclusion that disks around such stars are still relatively common at 670Myr and are similar to the rate around early-type stars. The apparently small difference in decay rates between early-type and solar-like stars is inconsistent with the first-order theoretical predictions that the later type stellar disks would decay an order of magnitude more quickly than the earlier type ones.

Item Type:	Article
Publisher’s Statement:	© 2012 The American Astronomical Society. Published by IOP Publishing.
ID number or DOI:	10.1088/0004-637X/750/2/98
Keywords:	age-dependence; Astronomical observations; circumstellar matter; dusty debris; hyades cluster; infrared: stars; main-sequence stars; multiband imaging photometer; open clusters and associations: individual (Hyades, Coma Ber, Praesepe); open clusters and associations: individual (Hyades, Coma Ber, Praesepe); planetary systems; research; Solar photosphere; solar-type stars; Space telescopes; spitzer-space-telescope; Spitzer Space Telescope (Spacecraft); Stars; Stellar spectra; sun-like stars; terrestrial planet formation; vega phenomenon
Subjects:	Q Science > QB Astronomy
NAU Depositing Author Academic Status:	Faculty/Staff
Department/Unit:	College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited:	30 Sep 2015 17:59
URI:	http://openknowledge.nau.edu/id/eprint/437

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