The Disk and Environment of HD 169142

Details The Disk and Environment of HD 169142 The Disk and Environment of HD 169142

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nrdd.conf...10g&link_type=abstract

Proceedings of the Miniworkshop on Nearby Resolved Debris Disks. October 19-20, 2005. Space Telescope Science Institute, Baltimo

Astronomy and Astrophysics

Astrophysics

Scientific paper

One of the predicted steps in the evolution of a planetary system is central clearing of the disk. Disks with a transitional character, with deficits of warm dust and gas, but abundant material at larger distances from the star are of particular interest. If such disks can be securely dated, they place direct constraints on the lifetime of gas in the disks, and thus the epoch of giant planet formation and migration. Since its identification as a Vega-like system, HD 169142 has attracted interest with its combination of PAH emission, an absence of warm silicate emission, and an infrared SED indicating central clearing of the disk. More recently, attention has focussed on the molecular gas content of the disk. We present coronagraphic imagery of the outer disk, obtained with HST/NICMOS, supplemented by narrow-band optical imagery obtained with the Goddard Fabry-Perot, and optical spectroscopy using the Dual Imaging Spectrograph at the Apache Point Observatory 3.5m telescope. These data reveal that HD 169142 is not an isolated star, but has 2 nearby T Tauri stars which have been co-moving with the Herbig Ae star since at least the late 1980s. We discuss the disk, its inferred age of 8+/-3 Myr, and the nature of any bodies responsible for clearing the inner regions of the disk. This study made use of data obtained as part of HST-GO-10177. Apache Point Observatory observations with the Goddard Fabry-Perot were made through a grant of Directors Discretionary Time. Apache Point Observatory is operated by the Astrophysical Research Consortium.

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