The discovery of new warm debris disks around F-type stars

A. Moór, D. Apai, I. Pascucci, P. Ábrahám, C. Grady, Th Henning, A. Juhász, Cs Kiss, Á Kóspál

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

We report the discovery of four rare debris disks with warm excesses around F stars, significantly increasing the number of such systems known in the solar neighborhood. Three of the disks are consistent with the predictions of steady-state planetesimal disk evolution models. The oldest source, HD 169666, displays a dust fractional luminosity too high to be in a steady state and we suggest that this system recently underwent a transient event of dust production. In addition, two spectra of this star separated by approximately three years show silicate emission features, indicative of submicron- to micron-sized grains. We argue that such small grains would be rapidly depleted and their presence in both spectra suggests that the production of small dust is continuous over a timescale of at least a few years. We predict that systems showing variable mid-infrared spectra, if they exist, will provide valuable help in distinguishing the possible scenarios proposed for dust replenishment.

Original languageEnglish (US)
Pages (from-to)L25-L29
JournalAstrophysical Journal
Volume700
Issue number1 PART 2
DOIs
StatePublished - 2009
Externally publishedYes

Keywords

  • Circumstellar matter - infrared
  • Stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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