The heart of Sakurai's Object revealed by ALMA
Daniel Tafoya, Peter A. M. van Hoof, Jesus A. Toala, Griet Van de, Steene, Suzanna Randall, Ramlal Unnikrishnan, Stefan Kimeswenger, Marcin, Hajduk, Daniela Barria, Albert Zijlstra

TL;DR
This study uses ALMA to directly image the dust disc and bipolar outflows in Sakurai's object, revealing rapid formation of these structures within 30 years of the born-again event.
Contribution
First direct imaging of a dust disc and bipolar outflows in Sakurai's object, providing new insights into its morpho-kinematical evolution post-born-again event.
Findings
Detection of a compact dust disc composed of amorphous carbon
Observation of bipolar molecular outflows with high expansion velocities
Estimation of disc and outflow parameters such as inclination, velocity, and size
Abstract
We present high angular-resolution observations of Sakurai's object using the Atacama Large Millimeter Array, shedding new light on its morpho-kinematical structure. The millimetre continuum emission, observed at an angular resolution of 20 milliarcsec (corresponding to 70 AU), reveals a bright compact central component whose spectral index indicates that it composed of amorphous carbon dust. Based on these findings, we conclude that this emission traces the previously suggested dust disc observed in mid-infrared observations. Therefore, our observations provide the first direct imaging of such a disc. The HCN(=43) line emission, observed at an angular resolution of 300 milliarcsec (corresponding to 1000 AU), displays bipolar structure with a north-south velocity gradient. From the position-velocity diagram of this emission we identify the presence of an expanding…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Astrophysical Phenomena and Observations · Stellar, planetary, and galactic studies
