Bright Debris Disk Candidates Observed with AKARI/Far-Infrared Surveyor (FIS)

TL;DR

This study identifies and characterizes 83 luminous debris disk candidates around main-sequence stars using AKARI/FIS data, providing a uniform survey with improved resolution and insights into dust properties.

Contribution

It presents a new, uniformly selected sample of debris disks from all-sky infrared survey data with detailed spectral energy distribution analysis.

Findings

83 debris disk candidates identified with infrared excess.

Most stars are early spectral types, B to K.

Many disks show evidence of warm dust components.

Abstract

We cross-correlate \hip\ main-sequence star catalog with \fis\ catalog, and identify 136 stars (at $>90$% reliability) with far-infrared detections at least in one band. After rejecting 51 stars classified as young stellar objects, Be stars, other type stars with known dust disks or with potential contaminations and 2 stars without infrared excess emission, we obtain a sample of 83 candidate stars with debris disks. Stars in our sample cover spectral types from B to K-types with most being early types. This represents an unique sample of luminous debris disks that derived uniformly from all sky survey with a spatial resolution a factor of two better than the previous such survey by \iras. Moreover, by collecting the infrared photometric data from other public archives, 85% of them have infrared excesses in more than one bands, allowing the estimate of the dust temperatures. We fit the blackbody model to the broad band spectral energy distribution of these stars to derive the statistical distribution of the disk parameters. 7 stars require an additional warm component of temperature around 200 K. While a substantial fraction of our sample(58 stars) have weak 12 \micron\ excess indicating that a warm dust component maybe common among these bright debris disk systems.