VARIABILITY OF DISK EMISSION IN PRE-MAIN SEQUENCE AND RELATED STARS. III. EXPLORING STRUCTURAL CHANGES IN THE PRE-TRANSITIONAL DISK IN HD 169142

We present near-IR (NIR) and far-UV observations of the pre-transitional (gapped) disk in HD 169142 using NASA's Infrared Telescope Facility and Hubble Space Telescope. The combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability...

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Bibliographic Details
Published in:The Astrophysical journal 2015-01, Vol.798 (2), p.1-15
Main Authors: Wagner, Kevin R, Sitko, Michael L, Grady, Carol A, Swearingen, Jeremy R, Champney, Elizabeth H, Johnson, Alexa N, Werren, Chelsea, Whitney, Barbara A, Russell, Ray W, Schneider, Glenn H
Format: Article
Language:English
Subjects:
Accretion
Accretion disks
Approximation
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPUTER CODES
Computer simulation
DENSITY
Disks
ENERGY SPECTRA
FAR ULTRAVIOLET RADIATION
MASS
MONTE CARLO METHOD
NEAR INFRARED RADIATION
Planet formation
PLANETS
PROTOPLANETS
PROTOSTARS
RADIANT HEAT TRANSFER
STAR ACCRETION
STAR EVOLUTION
Stars
TELESCOPES
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Summary:We present near-IR (NIR) and far-UV observations of the pre-transitional (gapped) disk in HD 169142 using NASA's Infrared Telescope Facility and Hubble Space Telescope. The combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability of up to 45% between ~1.5-10 [mu]m over a maximum timescale of 10 yr. All observations known to us separate into two distinct states corresponding to a high near-IR state in the pre-2000 epoch and a low state in the post-2000 epoch, indicating activity within the [
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/798/2/94