OGLE-2013-BLG-0911Lb: A Secondary on the Brown-dwarf Planet Boundary around an M Dwarf
Abstract
We present the analysis of the binary-lens microlensing event OGLE-2013-BLG-0911. The best-fit solutions indicate the binary mass ratio of q 0.03, which differs from that reported in Shvartzvald et al. The event suffers from the well-known close/wide degeneracy, resulting in two groups of solutions for the projected separation normalized by the Einstein radius of s ~ 0.15 or s ~ 7. The finite source and the parallax observations allow us to measure the lens physical parameters. The lens system is an M dwarf orbited by a massive Jupiter companion at very close (M_(host) = 0.30^(+0.08)_(-0.06)M⊙, M_(comp) = 10.1^(+2.9)_(-2.2)M_(Jup), a_(exp) = 0.40^(+0.05)_(-0.04) au) or wide (M_(host) = 0.28^(+0.10)_(-0.08) M⊙, M_(comp) = 9.9^(+3.8)_(-3.5)M_(Jup), a(exp) = 18.0^(+3.8)_(3.5) au) separation. Although the mass ratio is slightly above the planet-brown dwarf (BD) mass-ratio boundary of q = 0.03, which is generally used, the median physical mass of the companion is slightly below the planet-BD mass boundary of 13M_(Jup). It is likely that the formation mechanisms for BDs and planets are different and the objects near the boundaries could have been formed by either mechanism. It is important to probe the distribution of such companions with masses of ~13M_(Jup) in order to statistically constrain the formation theories for both BDs and massive planets. In particular, the microlensing method is able to probe the distribution around low-mass M dwarfs and even BDs, which is challenging for other exoplanet detection methods.
Additional Information
© 2020 The American Astronomical Society. Received 2019 October 17; revised 2019 December 18; accepted 2019 December 19; published 2020 January 31. We would like to thank the anonymous referee who helped to greatly improve our paper. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. CITEUC is funded by National Funds through FCT—Foundation for Science and Technology (project: UID/Multi/00611/2013) and FEDER—European Regional Development Fund through COMPETE 2020—Operational Programme Competitiveness and Internationalization (project: POCI-01-0145-FEDER-006922). D.P.B., A.B., and D.S. were supported by NASA through grant NASA-NNX12AF54G. Work by C.R. was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by USRA through a contract with NASA. Work by N.K. is supported by JSPS KAKENHI grant No. JP15J01676. Work by Y.H. is supported by JSPS KAKENHI grant No. JP1702146. N.J.R. is a Royal Society of New Zealand Rutherford Discovery Fellow. This work was supported by JSPS KAKENHI grant No. JP17H02871. This research was supported by the I-CORE program of the Planning and Budgeting Committee and the Israel Science Foundation, grant 1829/12. D.M. acknowledges support by the U.S.-Israel Binational Science Foundation. Work by C.H. was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. Work by W.Z., Y.K.J., and A.G. was supported by AST1516842 from the US NSF. W.Z., I.G.S., and A.G. were supported by JPL grant 1500811. Y.T. acknowledges the support of DFG priority program SPP 1992 "Exploring the Diversity of Extrasolar Planets" (WA 1047/11-1). K.H. acknowledges support from STFC grant ST/R000824/1.Attached Files
Published - Miyazaki_2020_AJ_159_76.pdf
Accepted Version - 1912.09613.pdf
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Additional details
- Eprint ID
- 101039
- Resolver ID
- CaltechAUTHORS:20200131-135216215
- MAESTRO 2014/14/A/ST9/00121
- National Science Centre (Poland)
- UID/Multi/00611/2013
- Fundação para a Ciência e a Tecnologia (FCT)
- COMPETE 2020
- Fundação para a Ciência e a Tecnologia (FCT)
- POCI-01-0145-FEDER-006922
- Fondo Europeo de Desarrollo Regional (FEDER)
- NNX12AF54G
- NASA
- NASA Postdoctoral Program
- JP15J01676
- Japan Society for the Promotion of Science (JSPS)
- JP1702146
- Japan Society for the Promotion of Science (JSPS)
- Royal Society
- JP17H02871
- Japan Society for the Promotion of Science (JSPS)
- I-CORE Program of the Planning and Budgeting Committee
- 1829/12
- Israel Science Foundation
- Binational Science Foundation (USA-Israel)
- 2017R1A4A1015178
- National Research Foundation of Korea
- AST-1516842
- NSF
- 1500811
- JPL
- SPP 1992
- Deutsche Forschungsgemeinschaft (DFG)
- WA 1047/11-1
- Deutsche Forschungsgemeinschaft (DFG)
- ST/R000824/1
- Science and Technology Facilities Council (STFC)
- Created
-
2020-01-31Created from EPrint's datestamp field
- Updated
-
2023-03-16Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)