Gas Accretion within the Dust Cavity in AB Aur
Artikel i vetenskaplig tidskrift, 2019

AB Aur is a Herbig Ae star hosting a well-known transitional disk. Because of its proximity and low inclination angle, it is an excellent object to study planet formation. Our goal is to investigate the chemistry and dynamics of the molecular gas component in the AB Aur disk, and its relation with the prominent horseshoe shape observed in continuum mm emission. We used the Northern Extended Milimeter Array interferometer to map with high angular resolution the J = 3-2 lines of HCO+ and HCN. By combining both, we can gain insight into the AB Aur disk structure. Chemical segregation is observed in the AB Aur disk: HCO+ shows intense emission toward the star position, at least one bright molecular bridge within the dust cavity, and ring-like emission at larger radii, while HCN is only detected in an annular ring that is coincident with the dust ring and presents an intense peak close to the dust trap. We use HCO+ to investigate the gas dynamics inside the cavity. The observed bright HCO+ bridge connects the compact central source with the outer dusty ring. This bridge can be interpreted as an accretion flow from the outer ring to the inner disk/jet system proving gas accretion through the cavity.

stars: pre-main sequence

protoplanetary disks

planet

circumstellar matter

disk interactions

planets and satellites: formation

stars: individual (AB Auriga)

Författare

Pablo Riviere-Marichalar

Observatorio Astronómico Nacional (OAN)

Asuncion Fuente

Observatorio Astronómico Nacional (OAN)

Clement Baruteau

Centre national de la recherche scientifique (CNRS)

Roberto Neri

Institut de RadioAstronomie Millimetrique (IRAM)

Sandra Treviño Morales

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

Andres Carmona

Centre national de la recherche scientifique (CNRS)

Marcelino Agundez

Consejo Superior de Investigaciones Científicas

Rafael Bachiller

Observatorio Astronómico Nacional (OAN)

Astrophysical Journal Letters

2041-8205 (ISSN) 2041-8213 (eISSN)

Vol. 879 1 L14

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.3847/2041-8213/ab289d

Mer information

Senast uppdaterat

2019-08-26