# Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Diverse outcomes of binary-disk interactions

**Authors:** Yapeng Zhang, Christian Ginski, Jane Huang, Alice Zurlo, Hervé Beust, Jaehan Bae, Myriam Benisty, Antonio Garufi, Michiel R. Hogerheijde, Rob G. van Holstein, Matthew Kenworthy, Maud Langlois, Carlo F. Manara, Paola Pinilla, Christian Rab, Álvaro Ribas, Giovanni P. Rosotti, Jonathan Williams  
**arXiv:** [2302.12824](https://arxiv.org/abs/2302.12824)  
**Date:** 2023-02-24  
**Summary page:** https://www.summarizepaper.com/en/paper/2302.12824v1/

## Key points

- The DESTINYS program investigates and compares circumstellar disks in stellar multiple systems using near-infrared scattered-light imaging.
- Resolving disks in binary systems provides the opportunity to examine the influence of stellar companions on the outcomes of planet formation.
- The team used polarimetric differential imaging with SPHERE/IRDIS at the VLT to search for scattered light from circumstellar disks in three multiple systems: CHX 22, S CrA, and HP Cha.
- Astrometric and orbit analyses were performed for the stellar companions using archival HST, VLT/NACO, and SPHERE data.
- Small grains in CHX 22 form a tail-like structure surrounding the close binary system, likely resulting from a close encounter and capture of a cloudlet.
- S CrA shows intricate structures (tentative ringed and spiral features) in the circumprimary disk as a possible consequence of perturbations by companions. The circumsecondary disk is truncated and connected to the primary disk via a streamer, suggesting tidal interactions.
- In HP Cha, the primary disk is less disturbed and features a tenuous streamer through which material flows towards companions.
- Comparison of these three systems spans a wide range of binary separation (50-500 au) and illustrates decreasing influence on disk structures with increasing distance from companions.
- Planet formation is likely obstructed around close binary systems but not suppressed in wide binaries according to statistical analysis.
- Resolving disks in binary systems can provide valuable insights into planet formation processes influenced by companion stars.

## Summary

The Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS) program aims to investigate and compare circumstellar disks in stellar multiple systems using near-infrared scattered-light imaging. As about half of solar-type stars were born in binary or multiple systems, resolving disks in binary systems provides the opportunity to examine the influence of stellar companions on the outcomes of planet formation. Using polarimetric differential imaging with SPHERE/IRDIS at the VLT, the team searched for scattered light from circumstellar disks in three multiple systems: CHX 22, S CrA, and HP Cha. They performed astrometric and orbit analyses for the stellar companions using archival HST, VLT/NACO, and SPHERE data. Combined with age and orbital constraints, the observed disk structures provide insights into the evolutionary history and impact of stellar companions. The study found that small grains in CHX 22 form a tail-like structure surrounding the close binary system, likely resulting from a close encounter and capture of a cloudlet. S CrA shows intricate structures (tentative ringed and spiral features) in the circumprimary disk as a possible consequence of perturbations by companions. The circumsecondary disk is truncated and connected to the primary disk via a streamer, suggesting tidal interactions. In HP Cha, the primary disk is less disturbed and features a tenuous streamer through which material flows towards companions. The comparison of these three systems spans a wide range of binary separation (50-500 au) and illustrates decreasing influence on disk structures with increasing distance from companions. This agrees with statistical analysis showing that planet formation is likely obstructed around close binary systems but not suppressed in wide binaries. Overall, this study highlights how resolving disks in binary systems can provide valuable insights into planet formation processes influenced by companion stars.