An extremely red and two other nearby L dwarf candidates previously overlooked in 2MASS, WISE, and other surveys

TL;DR

This paper reports the discovery of three nearby L dwarf candidates, including an extremely red L7.5p, a binary L5 system, and an L7 dwarf, identified through combined survey data and photometric analysis, expanding the known local low-mass star population.

Contribution

The study introduces three new nearby L dwarf candidates found using a combined color and proper motion search, including the first candidate associated with the Carina-Near moving group.

Findings

One candidate is an extremely red L7.5p dwarf at 16 pc.

One is a binary L5 dwarf system at 19 pc.

The nearest candidate is an L7 dwarf at 10 pc.

Abstract

We present three new nearby L dwarf candidates, found in a continued combined color/proper motion search using WISE, 2MASS, and other survey data, where we included extended WISE sources and looked closer to the Galactic plane region. Their spectral types and distances were estimated from photometric comparisons to well-known L dwarfs with trigonometric parallaxes. The first object, 2MASS J07555430-3259589, is an extremely red L7.5p dwarf candidate at a photometric distance of about 16 pc. Its position, proper motion and distance are consistent with membership in the Carina-Near young moving group. The second one, 2MASS J07414279-0506464, is resolved in Gaia DR1 as a close binary (separation 0.3 arcsec), and we classify it as a equal-mass binary candidate consisting of two L5 dwarfs at 19 pc. Our nearest new neighbor, 2MASS J19251275+0700362, is an L7 dwarf candidate at 10 pc.