Multiple shells driven by disk winds: ALMA observations in the HH 30 outflow

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F24%3A00617498" target="_blank" >RIV/67985815:90106/24:00617498 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-4357/ad132a" target="_blank" >https://doi.org/10.3847/1538-4357/ad132a</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad132a" target="_blank" >10.3847/1538-4357/ad132a</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Multiple shells driven by disk winds: ALMA observations in the HH 30 outflow

Popis výsledku v původním jazyce

We present archival Atacama Large Millimeter/submillimeter Array band 6 observations of the 13CO (J = 2-1) and 12CO (J = 2-1) molecular line emission of the protostellar system associated with HH 30. The 13CO molecular line shows the accretion disk while the molecular outflow is traced by the emission of the 12CO molecular line. We estimated a dynamical mass for the central object of 0.45 +/- 0.14 M circle dot, and a mass for the molecular outflow of (1.83 +/- 0.19) x 10-4 M circle dot. The molecular outflow presents an internal cavity as well as multiple outflowing shell structures. We distinguish three different shells with constant expansion (similar to 4-6 km s-1) and possible rotation signatures (<= 0.5 km s-1). We find that the shells can be explained by magnetocentrifugal disk winds with launching radii R launch less than or similar to 4 au and a small magnetic lever arm lambda similar to 1.6-1.9. The multiple shell structure may be the result of episodic ejections of the material from the accretion disk associated with three different epochs with dynamical ages of 497 +/- 15 yr, 310 +/- 9 yr, and 262 +/- 11 yr for the first, second, and third shells, respectively. The outermost shell was ejected 187 +/- 17 yr before the middle shell, while the middle shell was launched 48 +/- 14 yr before the innermost shell. Our estimations of the linear and angular momentum rates of the outflow as well as the accretion luminosity are consistent with the values expected if the outflow of HH 30 is produced by a wide-angle disk wind.

Název v anglickém jazyce

Multiple shells driven by disk winds: ALMA observations in the HH 30 outflow

Popis výsledku anglicky

We present archival Atacama Large Millimeter/submillimeter Array band 6 observations of the 13CO (J = 2-1) and 12CO (J = 2-1) molecular line emission of the protostellar system associated with HH 30. The 13CO molecular line shows the accretion disk while the molecular outflow is traced by the emission of the 12CO molecular line. We estimated a dynamical mass for the central object of 0.45 +/- 0.14 M circle dot, and a mass for the molecular outflow of (1.83 +/- 0.19) x 10-4 M circle dot. The molecular outflow presents an internal cavity as well as multiple outflowing shell structures. We distinguish three different shells with constant expansion (similar to 4-6 km s-1) and possible rotation signatures (<= 0.5 km s-1). We find that the shells can be explained by magnetocentrifugal disk winds with launching radii R launch less than or similar to 4 au and a small magnetic lever arm lambda similar to 1.6-1.9. The multiple shell structure may be the result of episodic ejections of the material from the accretion disk associated with three different epochs with dynamical ages of 497 +/- 15 yr, 310 +/- 9 yr, and 262 +/- 11 yr for the first, second, and third shells, respectively. The outermost shell was ejected 187 +/- 17 yr before the middle shell, while the middle shell was launched 48 +/- 14 yr before the innermost shell. Our estimations of the linear and angular momentum rates of the outflow as well as the accretion luminosity are consistent with the values expected if the outflow of HH 30 is produced by a wide-angle disk wind.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

962

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

28

Kód UT WoS článku

001155466400001

EID výsledku v databázi Scopus

2-s2.0-85183993252