Dust grain evolution in spatially resolved T Tauri binaries

Andrew J. Skemer, Laird M. Close, Thomas P. Greene, Philip M. Hinz, William F. Hoffmann, Jared R. Males

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Core-accretion planet formation begins in protoplanetary disks with the growth of small, interstellar medium dust grains into larger particles. The progress of grain growth, which can be quantified using 10 μm silicate spectroscopy, has broad implications for the final products of planet formation. Previous studies have attempted to correlate stellar and disk properties with the 10 μm silicate feature in an effort to determine which stars are efficient at grain growth. Thus far there does not appear to be a dominant correlated parameter. In this paper, we use spatially resolved adaptive optics spectroscopy of nine T Tauri binaries as tight as 025 to determine if basic properties shared between binary stars, such as age, composition, and formation history, have an effect on dust grain evolution. We find with 90%-95% confidence that the silicate feature equivalent widths of binaries are more similar than those of randomly paired single stars, implying that shared properties do play an important role in dust grain evolution. At lower statistical significance, we find with 82% confidence that the secondary has a more prominent silicate emission feature (i.e., smaller grains) than the primary. If confirmed by larger surveys, this would imply that spectral type and/or binarity are important factors in dust grain evolution.

Original languageEnglish (US)
Article number43
JournalAstrophysical Journal
Volume740
Issue number1
DOIs
StatePublished - Oct 10 2011

    Fingerprint

Keywords

  • binaries: general
  • instrumentation: adaptive optics
  • planets and satellites: formation
  • protoplanetary disks
  • stars: variables: T Tauri, Herbig Ae/Be

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this