WISEA J114724.10-204021.3: A Free-Floating Planetary Mass Member of the TW Hya Association

Abstract

We present WISEA J114724.10$-$204021.3, a young, low-mass, high probability member of the TW Hya association. WISEA J114724.10$-$204021.3 was discovered based on its red AllWISE color (W1$-$W2 = 0.63 mag) and extremely red 2MASS $J-K_{\mathrm{S}}$ color ($>$ 2.64 mag), the latter of which is confirmed with near-infrared photometry from the VISTA Hemisphere Survey ($J-K_{\mathrm{S}}$ = 2.57$\pm$0.03). Follow-up near-infrared spectroscopy shows a spectral type of L7 $\pm$ 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 $\sim$10 Myr old TW Hya association. Using the age of the TW Hya association and evolutionary models, we estimate the mass of WISEA J114724.10$-$204021.3 to be 5$-$13 $M_{\mathrm{Jup}}$, making it one of the youngest and lowest mass free-floating objects yet discovered in the Solar neighborhood.

arXiv commentAccepted for publication in ApJ Letters

References in corpus (38)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• Models of Stars, Brown Dwarfs and Exoplanets
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• A Giant Planet Candidate near a Young Brown Dwarf
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood
• A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs
• Bayesian analysis to identify new star candidates in nearby young stellar kinematic groups
• Atmospheric Parameters of Field L and T Dwarfs
• Discoveries from a Near-infrared Proper Motion Survey using Multi-epoch 2MASS Data
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups With Previously Known Signs of Youth
• Giant Planet Companion to 2MASSW J1207334-393254
• A Moving Cluster Distance to the Exoplanet 2M1207 B in the TW Hya Association
• The Extremely Red, Young L Dwarf PSO J318-22: A Free-Floating Planetary-Mass Analog to Directly Imaged Young Gas-Giant Planets
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• BANYAN. VII. A New Population of Young Substellar Candidate Members of Nearby Moving Groups from the BASS Survey
• Binaries and the L Dwarf/T Dwarf Transition
• Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9
• 2MASSJ035523.51+113337.4: A Young, Dusty, Nearby, Isolated Brown Dwarf Resembling A Giant Exoplanet
• First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799
• BANYAN. V. A Systematic All-Sky Survey for New Very Late-Type Low-Mass Stars and Brown Dwarfs in Nearby Young Moving Groups
• Discovery of the Young L Dwarf WISE J1741102.78-464225.5
• 2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary
• The TW Hydrae Association : trigonometric parallaxes and kinematic analysis
• Distance and Kinematics of the TW Hydrae Association from Parallaxes
• Spectroscopic Confirmation of Young Planetary-Mass Companions on Wide Orbits
• Discovery of an Unusually Red L-type Brown Dwarf
• WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group
• The extremely red L dwarf ULAS J222711$-$004547 - dominated by dust
• Towards Precise Ages and Masses of Free Floating Planetary Mass Brown Dwarfs
• A Targeted Search for Peculiarly Red L and T Dwarfs in SDSS, 2MASS, and WISE: Discovery of a Possible L7 Member of the TW Hydrae Association
• TW Hya Association Membership and New WISE-detected Circumstellar Disks
• Identifying Nearby, Young, Late-type Stars by Means of Their Circumstellar Disks
• Early Results from VLT-SPHERE: Long-Slit Spectroscopy of 2MASS 0122-2439B, a Young Companion Near the Deuterium Burning Limit
• New members of the TW Hydrae Association and two accreting M-dwarfs in Scorpius-Centaurus

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