The ALMA Early Science view of FUor/EXor objects. I. Through the looking-glass of V2775 Ori
Alice Zurlo, Lucas A. Cieza, Jonathan P. Williams, Hector Canovas,, Sebastian Perez, Antonio Hales, Koraljka Mu\v{z}i\'c, David A. Principe, Dary, Ru\'iz-Rodr\'iguez, John Tobin, Yichen Zhang, Zhaohuan Zhu, Simon Casassus,, Jose L. Prieto

TL;DR
This study uses ALMA observations to analyze the circumstellar environment of the FUor star V2775 Ori, revealing a nearly face-on disc and expanding shells indicative of episodic outbursts, contributing to understanding young eruptive variables.
Contribution
First ALMA Cycle-2 observations of V2775 Ori's circumstellar environment, revealing disc structure and outflow features associated with episodic accretion events.
Findings
Detected a marginally resolved circumstellar disc with a radius of ~30 au.
Observed expanding shells of gas indicative of quasi-episodic outbursts.
Derived velocities and physical properties of the outflowing material.
Abstract
As part of an ALMA survey to study the origin of episodic accretion in young eruptive variables, we have observed the circumstellar environment of the star V2775 Ori. This object is a very young, pre-main sequence object which displays a large amplitude outburst characteristic of the FUor class. We present Cycle-2 band 6 observations of V2775 Ori with a continuum and CO (2-1) isotopologue resolution of 0.25\as (103 au). We report the detection of a marginally resolved circumstellar disc in the ALMA continuum with an integrated flux of mJy, characteristic radius of 30 au, inclination of deg, and is oriented nearly face-on with respect to the plane of the sky. The \co~emission is separated into distinct blue and red-shifted regions that appear to be rings or shells of expanding material from quasi-episodic outbursts. The system is oriented in…
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