TY - JOUR
T1 - WATER ICE at the SURFACE of the HD 100546 DISK
AU - Honda, M.
AU - Kudo, T.
AU - Takatsuki, S.
AU - Inoue, A. K.
AU - Nakamoto, T.
AU - Fukagawa, M.
AU - Tamura, M.
AU - Terada, H.
AU - Takato, N.
N1 - Funding Information:
We are grateful to all of the staff members of the Subaru Telescope, the Gemini Telescope, and Optical Coatings Japan for the production of the narrow band filters. We also thank the anonymous referee for useful comments. We appreciate Dr. Tom Hayward for his kind support during the observations and the installation of our H2O ice filter onto NICI. M.H. was supported by JSPS/MEXT KAKENHI (Grant-in-Aid for Young Scientists B: 21740141, Grant-in-Aid for Scientific Research on Innovative Areas: 26108512). M.T. is partly supported by the JSPS fund (No. 22000005).
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/4/10
Y1 - 2016/4/10
N2 - We made near-infrared multicolor imaging observations of a disk around Herbig Be star HD 100546 using Gemini/NICI. K (2.2 μm), H2O ice (3.06 μm), and L′ (3.8 μm) disk images were obtained and we found a 3.1 μm absorption feature in the scattered light spectrum, likely due to water ice grains at the disk surface. We compared the observed depth of the ice absorption feature with the disk model based on Oka et al., including the water ice photodesorption effect by stellar UV photons. The observed absorption depth can be explained by both the disk models with and without the photodesorption effect within the measurement accuracy, but the model with photodesorption effects is slightly more favored, implying that the UV photons play an important role in the survival/destruction of ice grains at the Herbig Ae/Be disk surface. Further improvement to the accuracy of the observations of the water ice absorption depth is needed to constrain the disk models.
AB - We made near-infrared multicolor imaging observations of a disk around Herbig Be star HD 100546 using Gemini/NICI. K (2.2 μm), H2O ice (3.06 μm), and L′ (3.8 μm) disk images were obtained and we found a 3.1 μm absorption feature in the scattered light spectrum, likely due to water ice grains at the disk surface. We compared the observed depth of the ice absorption feature with the disk model based on Oka et al., including the water ice photodesorption effect by stellar UV photons. The observed absorption depth can be explained by both the disk models with and without the photodesorption effect within the measurement accuracy, but the model with photodesorption effects is slightly more favored, implying that the UV photons play an important role in the survival/destruction of ice grains at the Herbig Ae/Be disk surface. Further improvement to the accuracy of the observations of the water ice absorption depth is needed to constrain the disk models.
KW - circumstellar matter
KW - protoplanetary disks
KW - stars: pre-main sequence
UR - http://www.scopus.com/inward/record.url?scp=84964666727&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84964666727&partnerID=8YFLogxK
U2 - 10.3847/0004-637X/821/1/2
DO - 10.3847/0004-637X/821/1/2
M3 - Article
AN - SCOPUS:84964666727
SN - 0004-637X
VL - 821
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 2
ER -