Holwerda, BW, Bridge, JS, Ryan, R, Kenworthy, MA, Pirzkal, N, Andersen, M, Wilkins, S, Smit, R, Bernard, SR, Meshkat, T, Steele, R and Bouwens, RC (2018) Substellar and low-mass dwarf identification with near-infrared imaging space observatories. Astronomy & Astrophysics, 620. ISSN 1432-0746

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Abstract

Aims. We aim to evaluate the near-infrared colors of brown dwarfs as observed with four major infrared imaging space observatories: the Hubble Space Telescope (HST), the James Webb Space Telescope (JWST), the Euclid mission, and the WFIRST telescope.
Methods. We used the SPLAT SPEX/ISPEX spectroscopic library to map out the colors of the M-, L-, and T-type dwarfs. We have identified which color–color combination is optimal for identifying broad type and which single color is optimal to then identify the subtype (e.g., T0-9). We evaluated each observatory separately as well as the narrow-field (HST and JWST) and wide-field (Euclid and WFIRST) combinations.
Results. The Euclid filters perform equally well as HST wide filters in discriminating between broad types of brown dwarfs. WFIRST performs similarly well, despite a wider selection of filters. However, subtyping with any combination of Euclid and WFIRST observations remains uncertain due to the lack of medium, or narrow-band filters. We argue that a medium band added to the WFIRST filter selection would greatly improve its ability to preselect brown dwarfs its imaging surveys.
Conclusions. The HST filters used in high-redshift searches are close to optimal to identify broad stellar type. However, the addition of F127M to the commonly used broad filter sets would allow for unambiguous subtyping. An improvement over HST is one of two broad and medium filter combinations on JWST: pairing F140M with either F150W or F162M discriminates very well between subtypes.

Item Type:	Article
Uncontrolled Keywords:	Science & Technology; Physical Sciences; Astronomy & Astrophysics; Galaxy: disk; Galaxy: halo; Galaxy: stellar content; gamma rays: stars; brown dwarfs; YOUNG BROWN DWARFS; SPECTRAL CLASSIFICATION; PHYSICAL-PROPERTIES; T-DWARF; STARS; GALAXIES; MULTIPLICITY; FIELD; I.; Science & Technology; Physical Sciences; Astronomy & Astrophysics; Galaxy: disk; Galaxy: halo; Galaxy: stellar content; gamma rays: stars; brown dwarfs; YOUNG BROWN DWARFS; SPECTRAL CLASSIFICATION; PHYSICAL-PROPERTIES; T-DWARF; STARS; GALAXIES; MULTIPLICITY; FIELD; I.; astro-ph.IM; astro-ph.IM; astro-ph.SR; Astronomy & Astrophysics; 0201 Astronomical and Space Sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	EDP Sciences
SWORD Depositor:	A Symplectic
Date Deposited:	15 Nov 2022 12:25
Last Modified:	15 Nov 2022 12:25
DOI or ID number:	10.1051/0004-6361/201832838
URI:	https://researchonline.ljmu.ac.uk/id/eprint/18134

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