Ice Sublimation in the Dynamic HD 100453 Disk Reveals a Rich Reservoir of Inherited Complex Organics
Protoplanetary disks around luminous young A-type stars are prime observational laboratories to determine the abundances of complex organic molecules (COMs) present during planet formation. In contrast to their lower stellar mass counterparts, these warmer disks contain the sublimation fronts of com...
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | The Astrophysical Journal Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/2041-8213/adc7b2 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Protoplanetary disks around luminous young A-type stars are prime observational laboratories to determine the abundances of complex organic molecules (COMs) present during planet formation. In contrast to their lower stellar mass counterparts, these warmer disks contain the sublimation fronts of complex molecules such as CH _3 OH on spatial scales accessible with the Atacama Large Millimeter/submillimeter Array (ALMA). We present ALMA observations of the Herbig Ae disk HD 100453 that uncover a rich reservoir of COMs sublimating from the dust cavity edge. In addition to CH _3 OH, we detect ^13 CH _3 OH for the first time in a Class II disk, revealing a factor of three enhancement of ^13 C in the disk large organics. A tentative detection of CH _2 DOH is also reported, resulting in a D/H of 1%–2%, which is consistent with the expected deuterium enhancement from the low-temperature CH _3 OH formation in molecular clouds and with the deuteration of CH _3 OH measured in comets. The detection of methyl-formate (CH _3 OCHO), at only a few percent level of CH _3 OH, is an order of magnitude lower compared to claims toward other organic-rich Herbig Ae disks but is more in line with organic abundance patterns toward the earlier stages of star formation. Together these data provide multiple lines of evidence that disks, and therefore the planet- and comet-forming materials, contain inherited interstellar ices and perhaps the strongest evidence to date that much of the interstellar organic ice composition survives the early stages of planet formation. |
|---|---|
| ISSN: | 2041-8205 |