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_S color (> 2.64 mag), the latter of which is confirmed with near-infrared photometry from the VISTA 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 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_(Jup), making it one of the youngest and lowest mass free-floating objects yet discovered in the Solar neighborhood.
Additional Information
© 2016 American Astronomical Society. Received 2016 March 8; accepted 2016 March 24; published 2016 April 21. This publication makes use of data products from the Wide-Field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, and NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology. WISE and NEOWISE are funded by the National Aeronautics and Space Administration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication made use of observations obtained as part of the VISTA Hemisphere Survey, ESO Progam, 179.A-2010 (PI: McMahon).Attached Files
Published - apjl_822_1_L1.pdf
Submitted - 1603.07985v1.pdf
Files
| Name | Size | Download all |
|---|---|---|
|
md5:aa720fc284a84d86b9092516017c02e3
|
874.7 kB | Preview Download |
|
md5:80bb8b5fddafbb6153a3a8eb15456536
|
902.6 kB | Preview Download |
Additional details
- Eprint ID
- 66354
- Resolver ID
- CaltechAUTHORS:20160421-101822594
- NASA
- NSF
- Created
-
2016-04-21Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)