OGLE-2018-BLG-1011Lb,c: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star

Creators: Han, Cheongho; Shvartzvald, Yossi; Beichman, Charles A.; Calchi Novati, S.; Henderson, Calen B.; KMTNet Collaboration; OGLE Collaboration; MOA Collaboration; CFHT Collaboration; UKIRT Microlensing Team

Abstract

We report a multiplanetary system found from the analysis of microlensing event OGLE-2018-BLG-1011, for which the light curve exhibits a double-bump anomaly around the peak. We find that the anomaly cannot be fully explained by the binary-lens or binary-source interpretations and its description requires the introduction of an additional lens component. The 3L1S (three lens components and a single source) modeling yields three sets of solutions, in which one set of solutions indicates that the lens is a planetary system in a binary, while the other two sets imply that the lens is a multiplanetary system. By investigating the fits of the individual models to the detailed light curve structure, we find that the multiple-planet solution with planet-to-host mass ratios ~9.5 × 10^(−3) and ~15 × 10^(−3) are favored over the other solutions. From the Bayesian analysis, we find that the lens is composed of two planets with masses 1.8^(+3.4)_(−1.1) M_J and 2.8^(+5.1)_(−1.7) M_J around a host with a mass 0.18^(+0.33)_(−0.10) M⊙ and located at a distance 7.1^(+1.1)_(−1.5) kpc. The estimated distance indicates that the lens is the farthest system among the known multiplanetary systems. The projected planet–host separations are ⊥,2=1.8^(+2.1)_(−1.5) au (0.8^(+0.9)_(−0.6) au) and a⊥,3=0.8^(+0.9)_(−0.6) au, where the values of a ⊥,2 inside and outside the parenthesis are the separations corresponding to the two degenerate solutions, indicating that both planets are located beyond the snow line of the host, as with the other four multiplanetary systems previously found by microlensing.

Additional Information

© 2019 The American Astronomical Society. Received 2019 April 10; revised 2019 June 25; accepted 2019 July 2; published 2019 August 19. Work by C.H. was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. Work by A.G. was supported by US NSF grant AST-1516842. A.G. received support from the European Research Council under the European Union's Seventh Framework Programme (FP 7) ERC grant Agreement No. [321035]. The MOA project is supported by JSPS KAKENHI grant No. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287. Y.M. acknowledges support in the form of grant JP14002006. D.P.B., A.B., and C.R. were supported by NASA through grant NASA-80NSSC18K0274. The 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. NJR is a Royal Society of New Zealand Rutherford Discovery Fellow. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to AU. 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 of CTIO in Chile, SAAO in South Africa, and SSO in Australia. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. W.Z., W.T., and S.M. acknowledge support by the National Science Foundation of China (Grant 11821303 and 11761131004). Work by W.Z., and P.F. was supported by Canada–France–Hawaii Telescope (CFHT). UKIRT is currently owned by the University of Hawaii (UH) and operated by the UH Institute for Astronomy; operations are enabled through the cooperation of the East Asian Observatory. The collection of the 2018 data reported here was supported by NASA grant NNG16PJ32C and JPL proposal #18-NUP2018-0016. We also acknowledge the high-speed internet service (KREONET) provided by the Korea Institute of Science and Technology Information (KISTI).

Attached Files

Published - Han_2019_AJ_158_114.pdf

Submitted - 1907.01741.pdf

Files

Han_2019_AJ_158_114.pdf

Files (6.3 MB)

Name	Size	Download all
Han_2019_AJ_158_114.pdf md5:610eb7e7bd87aa16034ce1f721f5297e	3.3 MB	Preview Download
1907.01741.pdf md5:35f30a8c300f56459c4c427df4edcf30	3.0 MB	Preview Download

Additional details

	All versions	This version
Views	0	0
Downloads	0	0
Data volume	0 Bytes	0 Bytes