2016/03/25 by Adam C. Schneider, James Windsor, Michael C. Cushing +2 · 66 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Infrared #Photometry (optics) #Planetary mass #Red Color #Sky #Southern Hemisphere #Spectroscopy #Stellar classification #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.3847/2041-8205/822/1/l1
published in The Astrophysical Journal Letters 822(1), L1 (IOP Publishing) · Accepted for publication in ApJ Letters
arxiv created 2016/03/25 · openalex publication_date 2016/04/20 · arxiv updated 2016/04/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
ABSTRACT We present WISEA J114724.10-204021.3, a young, low-mass, high-probability member of the TW Hya association (TWA). WISEA J114724.10-204021.3 was discovered based on its red AllWISE color ( W 1 − W 2 = 0.63 mag) and extremely red 2MASS J − K S color (>2.64 mag), the latter of which is confirmed with near-infrared photometry from the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey ( J − K S = 2.57 ± 0.03). Follow-up near-infrared spectroscopy shows a spectral type of L7 ± 1 as well as several spectroscopic indicators of youth. These include a peaked H -band shape and a steeper K -band slope, traits typically attributed to low surface gravity. The sky position, proper motion, and distance estimates of WISEA J114724.10-204021.3 are all consistent with membership in the ∼10 Myr old TWA. Using the age of the TWA and evolutionary models, we estimate the mass of WISEA J114724.10-204021.3 to be 5–13 M Jup , making it one of the youngest and lowest-mass free-floating objects yet discovered in the Solar neighborhood.