New Millimeter CO Observations of the Gas-rich Debris Disks 49 Cet and HD32297

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

New Millimeter CO Observations of the Gas-rich Debris Disks 49 Cet and HD32297

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

New Millimeter CO Observations of the Gas-rich Debris Disks 49 Cet and HD32297

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

1538-4357

e-ISSN

—

Svazek periodika

884

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

108

Kód UT WoS článku

000501736400005

EID výsledku v databázi Scopus

2-s2.0-85075121665