Ultracool dwarfs candidates based on 6 yr of the Dark Energy Survey data

Desai, Shantanu (2023) Ultracool dwarfs candidates based on 6 yr of the Dark Energy Survey data. Monthly Notices of the Royal Astronomical Society, 522 (2). pp. 1951-1967. ISSN 0035-8711

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Abstract

We present a sample of 19 583 ultracool dwarf candidates brighter than z ≤23 selected from the Dark Energy Survey DR2 coadd data matched to VHS DR6, VIKING DR5, and AllWISE covering ∼ 480 deg2. The ultracool candidates were first pre-selected based on their (i–z), (z–Y), and (Y–J) colours. They were further classified using a method that compares their optical, near-infrared, and mid-infrared colours against templates of M, L, and T dwarfs. 14 099 objects are presented as new L and T candidates and the remaining objects are from the literature, including 5342 candidates from our previous work. Using this new and deeper sample of ultracool dwarf candidates we also present: 20 new candidate members to nearby young moving groups and associations, variable candidate sources and four new wide binary systems composed of two ultracool dwarfs. Finally, we also show the spectra of 12 new ultracool dwarfs discovered by our group and presented here for the first time. These spectroscopically confirmed objects are a sanity check of our selection of ultracool dwarfs and photometric classification method.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Uncontrolled Keywords:

brown dwarfs; stars: low-mass; surveys; Stars; Brown dwarfs; Classifieds; Dark energy; Energy surveys; Midinfrared; Near Infrared; Near-infrared; Optical-; Stars: low mass; Survey data; Infrared devices

Subjects:

Physics
Physics > Astronomy Astrophysics

Divisions:

Department of Physics

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

05 Jan 2024 15:18

Last Modified:

05 Jan 2024 15:18

URI:

http://raiithold.iith.ac.in/id/eprint/11777