• DOI:10.1088/2041-8205/808/1/L20
• Corpus ID: 118834638

SDSS J111010.01+011613.1: A New Planetary-Mass T Dwarf Member of the AB Doradus Moving Group

@article{Gagne2015SDSSJA,
  title={SDSS J111010.01+011613.1: A New Planetary-Mass T Dwarf Member of the AB Doradus Moving Group},
  author={Jonathan Gagn'e and Adam J. Burgasser and Jacqueline K. Faherty and David Lafreni{\`e}re and Ren{\'e} Doyon and Joseph C. Filippazzo and Emily C. Bowsher and Christine P. Nicholls},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2015}
}

• J. Gagn'e, A. Burgasser, +5 authors C. Nicholls
• Published 12 June 2015
• Physics, Geology
• arXiv: Solar and Stellar Astrophysics

We present a new radial velocity measurement that, together with a trigonometric parallax, proper motion and signs of low gravity from the literature, confirms that SDSS J111010.01+011613.1 is a new T5.5 bona fide member of AB Doradus. Fitting $\lambda/\Delta\lambda$ $\approx$ 6000 FIRE spectroscopy in the 1.20-1.33 $\mu$m region to BT-Settl atmosphere models yielded a radial velocity of $7.5 \pm 3.8$ km s$^{-1}$. At such a young age (110-130 Myr), current evolution models predict a mass of $\sim$ 10-12 $M_{\mathrm{Jup}}$, thus placing SDSS J1110+0116 well into the planetary-mass regime. We compare the fundamental properties of SDSS J1110+0116 with a sequence of seven recently identified M8-T5 brown dwarf bona fide or high-confidence candidate members of AB Doradus. We also note that its near-infrared $J-K$ color is redder than field T5-T6 brown dwarfs, however its absolute $J$-band magnitude is similar to them. SDSS J1110+0116 is one of the few age-calibrated T dwarfs known to date, as well as one of the coolest bona fide members of a young moving group.