English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present an adaptive optics imaging detection of the HD 32297 debris diskat L' (3.8 \microns) obtained with the LBTI/LMIRcam infrared instrument at theLBT. The disk is detected at signal-to-noise per resolution element ~ 3-7.5from ~ 0.3-1.1" (30-120 AU). The disk at L' is bowed, as was seen at shorterwavelengths. This likely indicates the disk is not perfectly edge-on andcontains highly forward scattering grains. Interior to ~ 50 AU, the surfacebrightness at L' rises sharply on both sides of the disk, which was alsopreviously seen at Ks band. This evidence together points to the diskcontaining a second inner component located at $\lesssim$ 50 AU. Comparing thecolor of the outer (50 $< r$/AU $< 120$) portion of the disk at L' witharchival HST/NICMOS images of the disk at 1-2 \microns allows us to test therecently proposed cometary grains model of Donaldson et al. 2013. We find thatthe model fails to match the disk's surface brightness and spectrumsimultaneously (reduced chi-square = 17.9). When we modify the densitydistribution of the model disk, we obtain a better overall fit (reducedchi-square = 2.9). 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 \microns isnecessary to constrain how much (if any) water ice exists in the disk, whichcan then help refine the originally proposed cometary grains model.

Does the Debris Disk around HD 32297 Contain Cometary Grains?