We present the discovery of CWISE J050626.96+073842.4 (CWISE J0506+0738), an L/T transition dwarf with extremely red near-infrared colors discovered through the Backyard Worlds: Planet 9 citizen science project. Photometry from UKIRT and CatWISE give a (
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Abstract J −K )MKOcolor of 2.97 ± 0.03 mag and aJ MKO− W2 color of 4.93 ± 0.02 mag, making CWISE J0506+0738 the reddest known free-floating L/T dwarf in both colors. We confirm the extremely red nature of CWISE J0506+0738 using Keck/NIRES near-infrared spectroscopy and establish that it is a low-gravity, late-type L/T transition dwarf. The spectrum of CWISE J0506+0738 shows possible signatures of CH4absorption in its atmosphere, suggesting a colder effective temperature than other known, young, red L dwarfs. We assign a preliminary spectral type for this source of L8γ –T0γ . We tentatively find that CWISE J0506+0738 is variable at 3–5μ m based on multiepoch WISE photometry. Proper motions derived from follow-up UKIRT observations combined with a radial velocity from our Keck/NIRES spectrum and a photometric distance estimate indicate a strong membership probability in theβ Pic moving group. A future parallax measurement will help to establish a more definitive moving group membership for this unusual object. -
Bickle, Thomas P. ; Jalowiczor, Peter A. ; Casewell, Sarah L. ; Faherty, Jacqueline K. ; Kiman, Rocio ; Schneider, Adam C. ; Kirkpatrick, J. Davy ; Meisner, Aaron M. ; Kuchner, Marc J. ; Caselden, Dan ; et al ( , Research Notes of the AAS)
Abstract We present WDJ220838.73+454434.04 (hereafter WD2208+454), a wide, co-moving white dwarf companion to the eclipsing binary system, AR Lacertae. The companion was discovered through the Backyard Worlds: Planet 9 citizen science collaboration. It has a separation of 21.″9 on the sky from the central eclipsing pair, translating to a projected separation of ∼930 au. We present a review of the physical properties and orbital parameters of this new addition to the system.