OGLE-2016-BLG-1266: A Probable Brown Dwarf/Planet Binary at the Deuterium Fusion Limit
Abstract
We report the discovery, via the microlensing method, of a new very low mass binary system. By combining measurements from Earth and from the Spitzer telescope in Earth-trailing orbit, we are able to measure the microlensing parallax of the event, and we find that the lens likely consists of a (12.0 ± 0.6)M_J + (15.7 ± 1.5)M_J super-Jupiter/brown dwarf pair. The binary is located at a distance of 3.08 ± 0.18 kpc in the Galactic plane, and the components have a projected separation of 0.43 ± 0.03 au. Two alternative solutions with much lower likelihoods are also discussed, an 8M J and 6M_J model and a 90M_J and 70M_J model. If all photometric measurements were independent and Gaussian distributed with known variances, these alternative solutions would be formally disfavored at the 3σ and 5σ levels. We show how the more massive of these models could be tested with future direct imaging.
Additional Information
© 2018 The American Astronomical Society. Received 2018 February 25; revised 2018 April 4; accepted 2018 April 15; published 2018 May 14. M.D.A. is supported by the Marsden Fund under contract UOC1602 and is grateful for the award of an ESO Visiting Fellowship in 2017 December/2018 January, during which time this paper was completed. Work by W.Z., Y.K.J., and A.G. was supported by AST-1516842 from the US NSF. W.Z., I.-G.S., and A.G. were supported by JPL grant 1500811. This work was (partially) supported by NASA contract NNG16PJ32C. Work by C.H. was supported by grant 2017R1A4A1015178 of the National Research Foundation of Korea. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI), and the data were obtained at three host sites: CTIO in Chile, SAAO in South Africa, and SSO in Australia. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. Work by Y.S. was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, California Institute of Technology, administered by Universities Space Research Association through a contract with NASA. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Software: pyDIA (Albrow 2017), emcee (Foreman-Mackey et al. 2013), MorseCode (McDougall & Albrow 2016).Attached Files
Published - Albrow_2018_ApJ_858_107.pdf
Submitted - 1802.09563.pdf
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Additional details
- Eprint ID
- 86393
- Resolver ID
- CaltechAUTHORS:20180514-112911275
- UOC1602
- Marsden Fund
- European Southern Observatory (ESO)
- AST-1516842
- NSF
- 1500811
- JPL
- NNG16PJ32C
- NASA
- 2017R1A4A1015178
- National Research Foundation of Korea
- 2014/14/A/ST9/00121
- National Science Centre (Poland)
- NASA Postdoctoral Program
- NASA/JPL/Caltech
- Created
-
2018-05-16Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)