circumstellar matter; instrumentation: adaptive optics; planetary systems; stars: individual: HD 32297; techniques: high angular resolution
Abstract :
[en] We present an adaptive optics imaging detection of the HD 32297 debris disk at L' (3.8 μm) obtained with the LBTI/LMIRcam infrared instrument at the Large Binocular Telescope. The disk is detected at signal-to-noise ratio per resolution element ~3-7.5 from ~0.''3 to 1.''1 (30-120 AU). The disk at L' is bowed, as was seen at shorter wavelengths. This likely indicates that the disk is not perfectly edge-on and contains highly forward-scattering grains. Interior to ~50 AU, the surface brightness at L' rises sharply on both sides of the disk, which was also previously seen at Ks band. This evidence together points to the disk containing a second inner component located at lsim50 AU. Comparing the color of the outer (50 <r/AU <120) portion of the disk at L' with archival Hubble Space Telescope/NICMOS images of the disk at 1-2 μm allows us to test the recently proposed cometary grains model of Donaldson et al. We find that the model fails to match this disk's surface brightness and spectrum simultaneously (reduced chi-square = 17.9). When we modify the density distribution of the model disk, we obtain a better overall fit (reduced chi-square = 2.87). The best fit to all of the data is a pure water ice model (reduced chi-square = 1.06), but additional resolved imaging at 3.1 μm is necessary to constrain how much (if any) water ice exists in the disk, which can then help refine the originally proposed cometary grains model. Based on observations made at the Large Binocular Telescope (LBT). The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are: the University of Arizona on behalf of the Arizona University system; Istituto Nazionale di Astrosica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; the Ohio State University, and the Research Corporation, on behalf of the University of Notre Dame, University of Minnesota and University of Virginia. Based on observations made using the Large Binocular Telescope Interferometer (LBTI). LBTI is funded by the National Aeronautics and Space Administration as part of its Exoplanet Exploration program.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rodigas, Timothy J.; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA ; Department of Terrestrial Magnetism, Carnegie Institute of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA ; Carnegie Postdoctoral Fellow.
Debes, John H.; Space Telescope Science Institute, Baltimore, MD 21218, USA
Hinz, Philip M.; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Mamajek, Eric E.; Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171, USA
Pecaut, Mark J.; Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171, USA ; Rockhurst University, 1100 Rockhurst Road, Kansas City, MO 64110, USA
Currie, Thayne; University of Toronto, 50 St. George Street, Toronto, ON M5S 1A1, Canada
Bailey, Vanessa; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Defrere, Denis ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
De Rosa, Robert J.; School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287-1404, USA
Hill, John M.; Large Binocular Telescope Observatory, University of Arizona, Tucson, AZ 85721, USA
Leisenring, Jarron; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Schneider, Glenn; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Skemer, Andrew J.; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Skrutskie, Michael; Department of Astronomy, University of Virginia, 530 McCormick Road, Charlottesville, VA 22903, USA
Vaitheeswaran, Vidhya; Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Ward-Duong, Kimberly; School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287-1404, USA)
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