An unbiased study of debris discs around A-type stars with Herschel

N. D. Thureau*, J. S. Greaves, B. C. Matthews, G. Kennedy, N. Phillips, M. Booth, G. Duchene, J. Horner, D. R. Rodriguez, B. Sibthorpe, M. C. Wyatt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)
1 Downloads (Pure)

Abstract

The Herschel DEBRIS (Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre) survey brings us a unique perspective on the study of debris discs around main-sequence A-type stars. Bias-free by design, the survey offers a remarkable data set with which to investigate the cold disc properties. The statistical analysis of the 100 and 160 μm data for 86 main-sequence A stars yields a lower than previously found debris disc rate. Considering better than 3σ excess sources, we find a detection rate ≥24 ± 5 per cent at 100 μm which is similar to the debris disc rate around main-sequence F/G/K-spectral type stars. While the 100 and 160 μm excesses slowly decline with time, debris discs with large excesses are found around some of the oldest A stars in our sample, evidence that the debris phenomenon can survive throughout the length of the main sequence (∼1 Gyr). Debris discs are predominantly detected around the youngest and hottest stars in our sample. Stellar properties such as metallicity are found to have no effect on the debris disc incidence. Debris discs are found around A stars in single systems and multiple systems at similar rates. While tight and wide binaries (<1 and >100 au, respectively) host debris discs with a similar frequency and global properties, no intermediate separation debris systems were detected in our sample.

Original languageEnglish
Pages (from-to)2558-2573
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume445
Issue number3
Early online date20 Oct 2014
DOIs
Publication statusPublished - 11 Dec 2014

Keywords

  • Surveys
  • Binaries: general
  • Circumstellar matter
  • Stars: individual: A-stars
  • Infrared: stars
  • Pictoris moving group
  • Stellar kinematic groups
  • Main-sequence stars
  • Beta-pictoris
  • Kuiper-belt
  • Dusty debris
  • Nearby stars
  • Collisional evolution
  • Solar-systems
  • Disks

Fingerprint

Dive into the research topics of 'An unbiased study of debris discs around A-type stars with Herschel'. Together they form a unique fingerprint.

Cite this