Searching for debris discs in the 30 Myr open cluster IC 4665

TL;DR

This study investigates debris discs around young stars in the 30 Myr open cluster IC 4665 using infrared data, identifying new candidates and comparing disc fractions with other similar-aged clusters.

Contribution

It provides the first detailed analysis of debris disc prevalence in IC 4665 using Spitzer and WISE data, including new candidate detections.

Findings

Six debris disc candidates identified, including two new ones.

Disc fraction of 24% for B-A stars, consistent with similar clusters.

Lower disc fraction (9%) observed for solar-type stars compared to other regions.

Abstract

Context: Debris discs orbiting young stars are key to understand dust evolution and the planetary formation process. We take advantage of a recent membership analysis of the 30 Myr nearby open cluster IC 4665 based on the Gaia and DANCe surveys to revisit the disc population of this cluster. Aims: We aim to study the disc population of IC 4665 using Spitzer (MIPS and IRAC) and WISE photometry. Methods: We use several colour-colour diagrams with empirical photospheric sequences to detect the sources with an infrared excess. Independently, we also fit the spectral energy distribution (SED) of our debris disc candidates with the Virtual Observatory SED analyser (VOSA) which is capable of automatically detecting infrared excesses and provides effective temperature estimates. Results: We find six candidates debris disc host-stars (five with MIPS and one with WISE) and two of them are new candidates. We estimate a disc fraction of 24$\pm$10\% for the B-A stars, where our sample is expected to be complete. This is similar to what has been reported in other clusters of similar ages (Upper Centaurus Lupus, Lower Centaurus Crux, the $\beta$ Pictoris moving group, and the Pleiades). For solar type stars we find a disk fraction of 9$\pm$9%, lower than that observed in regions with comparable ages. Conclusions: Our candidates debris disc host-stars are excellent targets to be studied with ALMA or the future James Webb Space Telescope (JWST).