SEEING THROUGH THE RING: NEAR-INFRARED PHOTOMETRY OF V582 MON (KH 15D)
Name
Arulanantham-2016-SEEING THROUGH the R.pdf
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2.3 MB
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Author(s)
Arulanantham, Nicole A.
Herbst, William
Cody, Ann Marie
Stauffer, John R.
Rebull, Luisa M.
Agol, Eric
Windemuth, Diana
Marengo, Massimo
Hamilton, Catrina M.
Mundt, Reinhard
Date Issued
March 2016
Journal
The Astronomical Journal
Publisher
IOP Publishing
Citation
Arulanantham, Nicole A., William Herbst, Ann Marie Cody, John R. Stauffer, Luisa M. Rebull, Eric Agol, Diana Windemuth, et al. “SEEING THROUGH THE RING: NEAR-INFRARED PHOTOMETRY OF V582 MON (KH 15D).” The Astronomical Journal 151, no. 4 (March 8, 2016): 90. © 2016 The American Astronomical Society
Version
Final published version
Abstract
We examine the light and color evolution of the T Tauri binary KH 15D through photometry obtained at wavelengths between 0.55 and 8.0 μm. The data were collected with A Novel Dual Imaging CAMera (ANDICAM) on the 1.3 m SMARTS telescope at Cerro-Tololo Inter-American Observatory and with InfraRed Array Camera on the Spitzer Space Telescope. We show that the system's circumbinary ring, which acts as a screen that covers and uncovers different portions of the binary orbit as the ring precesses, has reached an orientation where the brighter component (star B) fully or nearly fully emerges during each orbital cycle. The fainter component (star A) remains fully occulted by the screen at all phases. The leading and trailing edges of the screen move across the sky at the same rate of ~15 m s[superscript −1], consistent with expectation for a ring with a radius and width of ~4 au and a precession period of ~6500 years. Light and color variations continue to indicate that the screen is sharp edged and opaque at VRIJH wavelengths. However, we find an increasing transparency of the ring edge at 2.2, 3.6, and 4.5 μm. Reddening seen at the beginning of the eclipse that occurred during the CSI 2264 campaign particularly suggests selective extinction by a population of large dust grains. Meanwhile, the gradual bluing observed while star B is setting is indicative of forward scattering effects at the edge of the ring. The spectral energy distribution of the system at its bright phase shows no evidence of infrared excess emission that can be attributed to radiation from the ring or other dust component out to 8 μm.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/0004-6256/151/4/90
