Narrow belt of debris around the Sco-Cen star HD 141011

TL;DR

This paper reports the discovery and detailed imaging of a narrow debris ring around the star HD 141011, providing insights into its structure, orientation, and the absence of certain companions, contributing to the understanding of debris disks in the Sco-Cen association.

Contribution

First resolved imaging of a narrow debris ring around HD 141011, with detailed modeling of its structure and constraints on potential companions, expanding knowledge of debris disks in Sco-Cen.

Findings

The debris ring extends up to ~141 au from the star.

The disk is best modeled as a non-eccentric ring with specific inclination and position angle.

No brown-dwarf companions coplanar with the disk are detected within certain ranges.

Abstract

We initiated a deep-imaging survey of Scorpius-Centaurus A-F stars with predicted warm inner and cold outer belts of debris reminiscent of the architecture of emblematic systems such as HR 8799. We present resolved SPHERE images of a narrow ring of debris around the F5-type star HD 141011 that was observed as part of our survey in 2015, 2016, and 2019. The ring extends up to ~1.1" (~141 au) from the star in the IRDIS and IFS data obtained in 2016 and 2019. The disk is not detected in the 2015 data which are of poorer quality. The disks is best reproduced by models of a noneccentric ring centered on the star with an inclination of $69.1\pm0.9^{\circ}$, a position angle of $-24.6 \pm 1.7^{\circ}$, and a semimajor axis of $127.5\pm3.8$ au. The combination of radial velocity and imaging data excludes brown-dwarf (M>13.6 MJup) companions coplanar with the disk from 0.1 to 0.9 au and from 20 au up to 500 au (90% probability). HD 141011 adds to the growing list of debris disks that are resolved in Sco-Cen. It is one of the faintest disks that are resolved from the ground and has a radial extent and fractional width ($\sim$12.5%) reminiscent of Fomalhaut. Its moderate inclination and large semimajor axis make it a good target for the James Webb Space Telescope and should allow a deeper search for putative companions shaping the dust distribution.