Discovery of Crystallized Water Ice in a Silhouette Disk in the M43 Region

Details Discovery of Crystallized Water Ice in a Silhouette Disk in the M43 Region Discovery of Crystallized Water Ice in a Silhouette Disk in the M43 Region

2012-04-24

arxiv.org/abs/1204.5503v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

28 pages, 8 figures, Accepted by ApJ

Scientific paper

We present the 1.9--4.2um spectra of the five bright (L<11.2) young stars associated with silhouette disks with moderate to high inclination angle of 39--80deg in the M42 and M43 regions. The water ice absorption is seen toward d121-1925 and d216-0939, while the spectra of d182-316, d183-405, and d218-354 show no water ice feature around 3.1um within the detection limits. By comparing the water ice features toward nearby stars, we find that the water ice absorption toward d121-1925 and d216-0939 most likely originates from the foreground material and the surrounding disk, respectively. The angle of the disk inclination is found to be mainly responsible for the difference of the optical depth of the water ice among the five young stars. Our results suggest that there is a critical inclination angle between 65deg and 75deg for the circumstellar disk where the water ice absorption becomes strong. The average density at the disk surface of d216-0939 was found to be 6.38x10^(-18) g cm^(-3). The water ice absorption band in the d216-0939 disk is remarkable in that the maximum optical depth of the water ice band is at a longer wavelength than detected before. It indicates that the primary carrier of the feature is purely crystallized water ice at the surface of the d216-0939 disk with characteristic size of ~0.8um, which suggests grain growth. This is the first direct detection of purely crystallized water ice in a silhouette disk.

Affiliated with

Also associated with

No associations

Rating

Discovery of Crystallized Water Ice in a Silhouette Disk in the M43 Region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Discovery of Crystallized Water Ice in a Silhouette Disk in the M43 Region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of Crystallized Water Ice in a Silhouette Disk in the M43 Region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-137010