Searching for debris discs in the 30 Myr open cluster IC 4665. (arXiv:2007.04992v1 [astro-ph.SR])

Searching for debris discs in the 30 Myr open cluster IC 4665. (arXiv:2007.04992v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Miret_Roig_N/0/1/0/all/0/1">N&#xfa;ria Miret-Roig</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Huelamo_N/0/1/0/all/0/1">Nuria Hu&#xe9;lamo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouy_H/0/1/0/all/0/1">Herv&#xe9; Bouy</a>

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).

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).

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