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

Autor(en)

Jonathan Gagne, Adam J. Burgasser, Jacqueline K. Faherty, David Lafreniere, Rene Doyon, Christine Nicholls

Abstrakt

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 λ/Δλ ≈ 6000 Folded-port InfraRed Echellette spectroscopy in the 1.20-1.33 μm region to BT-Settl atmosphere models yielded a radial velocity of 7.5 ± 3.8 km s^-1. At such a young age (110-130 Myr), current evolution models predict a mass of ~ 10-12 M_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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Université de Montréal, University of California, San Diego, Carnegie Institution for Science, American Museum of Natural History

Journal

The Astrophysical journal Letters

Band

808

Anzahl der Seiten

6

ISSN

2041-8205

DOI

https://doi.org/10.1088/2041-8205/808/1/L20

Publikationsdatum

07-2015

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/sdss-j111010010116131-a-new-planetarymass-t-dwarf-member-of-the-ab-doradus-moving-group(df69a59b-ca02-4a50-8d04-81460192da1e).html