NOAO >   Observing Info >   Approved Programs >   2016A-0416

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Program Information for 2016A-0416


PI: S Mark Ammons, Lawrence Livermore National Laboratory, ammons1@llnl.gov
Address: Livermore, CA, 94551-9900 USA

CoI: Christian Marois, Herzberg Institute of Astrophysics
CoI: Bruce Macintosh, Stanford U.
CoI: Quinn Konopacky, University of Toronto
CoI: Benoit Neichel, Laboratoire d'Astrophysique de Marseille
CoI: Dmitry Savransky, Cornell U.

Title: The Best Parallaxes and a Limit on the Giant Planet Occurrence Rate for Nearby T Dwarf Hosts

Abstract: We propose to complete an astrometric monitoring program on ten of twenty T dwarfs currently being monitored with Keck NIRC2 and ShaneAO at Lick Observatory. The targets have been selected from WISE’s sample of brown dwarfs (Kirkpatrick et al. 2011), the UKIDSS Large Area Survey (Lawrence et al. 2012) and the UKIDSS Galactic Plane Survey (Lucas et al. 2012). The T dwarfs we observe are too optically faint to be targeted by existing optical radial velocity (RV) instruments or GAIA. Combined with continuing ShaneAO observations in 2016, the proposed observations will lead to < 1% trigonometric distances for the entire sample, enabling precision luminosity measurements, and obtain 0.3-1.0 MJUP limits with 0.2 < P < 6 years. In the case of no detections, the giant planet occurrence rate for T dwarfs could be shown to be distinct from that of A and FGK stars (Johnson et al. 2010) at the 2- and 1-sigma level, respectively, which would suggest that the trend of increasing giant planet frequency with stellar mass holds at the low mass end.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  GEM-SQ/GSAOI -- 4.2hrs band 2 (GS-2016A-Q-72)


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NOAO >   Observing Info >   Approved Programs >   2016A-0416

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