Constraints on the binary properties of mid- to late T dwarfs from Hubble space telescope WFC3 observations
- Centro de Astrobiología (INTA-CSIC), Departamento de Astrofísica, P.O. Box 78, E-28691 Villanueva de la Cañada, Madrid (Spain)
- Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093 (United States)
- ESA–ESAC, Gaia SOC. P.O. Box 78, E-28691 Villanueva de la Cañada, Madrid (Spain)
- Centro de Astrobiología (INTA-CSIC), Departamento de Astrofísica. Carretera de Ajalvir km 4, E-28550 Torrejín de Ardoz, Madrid (Spain)
- Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
- Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
We used Hubble Space Telescope/Wide Field Camera 3 (WFC3) observations of a sample of 26 nearby (≤20 pc) mid- to late T dwarfs to search for cooler companions and measure the multiplicity statistics of brown dwarfs (BDs). Tightly separated companions were searched for using a double point-spread-function-fitting algorithm. We also compared our detection limits based on simulations to other prior T5+ BD binary programs. No new wide or tight companions were identified, which is consistent with the number of known T5+ binary systems and the resolution limits of WFC3. We use our results to add new constraints to the binary fraction (BF) of T-type BDs. Modeling selection effects and adopting previously derived separation and mass ratio distributions, we find an upper limit total BF of <16% and <25% assuming power law and flat mass ratio distributions, respectively, which are consistent with previous results. We also characterize a handful of targets around the L/T transition.
- OSTI ID:
- 22342193
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 148, Issue 6; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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