New Millimeter CO Observations of the Gas-rich Debris Disks 49 Cet and HD32297
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00539882" target="_blank" >RIV/67985815:_____/19:00539882 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/1538-4357/ab4272" target="_blank" >https://doi.org/10.3847/1538-4357/ab4272</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/ab4272" target="_blank" >10.3847/1538-4357/ab4272</a>
Alternative languages
Result language
angličtina
Original language name
New Millimeter CO Observations of the Gas-rich Debris Disks 49 Cet and HD32297
Original language description
We used the Atacama Large Millimeter/submillimeter Array (ALMA) 7m Array to measure (CO)-C-13 and (CO)-O-18 emission toward two debris disks, 49 Cet and HD 32297, and detected similarly high CO content (>0.01 M-circle plus). These high CO masses imply a highly efficient shielding of CO molecules against stellar and interstellar ultraviolet photons. Adapting a recent secondary gas disk model that considers both shielding by carbon atoms and self-shielding of CO, we can explain the observed CO level in both systems. Based on the derived gas densities we suggest that, in the HD 32297 disk, dust and gas are coupled and the dynamics of small grains is affected by the gaseous component. For 49 Cet, the question of coupling remains undecided. We found that the main stellar and disk properties of 49 Cet and HD 32297 are very similar to those of previously identified debris disks with high CO content. These objects constitute together the first known representatives of shielded debris disks.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
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Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
1538-4357
e-ISSN
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Volume of the periodical
884
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
15
Pages from-to
108
UT code for WoS article
000501736400005
EID of the result in the Scopus database
2-s2.0-85075121665