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Keck Observations Confirm a Super-Jupiter Planet Orbiting M Dwarf OGLE-2005-BLG-071L

Bennett, David P. and Bhattacharya, Aparna and Beaulieu, Jean-Philippe and Blackman, Joshua W. and Vandorou, Aikaterini and Terry, Sean K. and Cole, Andrew A. and Henderson, Calen B. and Koshimoto, Naoki and Lu, Jessica R. and Marquette, Jean Baptiste and Ranc, Clément and Udalski, Andrzej (2020) Keck Observations Confirm a Super-Jupiter Planet Orbiting M Dwarf OGLE-2005-BLG-071L. Astronomical Journal, 159 (2). Art. No. 68. ISSN 1538-3881. doi:10.3847/1538-3881/ab6212.

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We present adaptive optics imaging from the NIRC2 instrument on the Keck II telescope that resolves the exoplanet host (and lens) star as it separates from the brighter source star. These observations yield the K-band brightness of the lens and planetary host star, as well as the lens-source relative proper motion, µ_(rel,H), in the heliocentric reference frame. The µ_(rel,H) measurement allows for the determination of the microlensing parallax vector, π_E, which had only a single component determined by the microlensing light curve. The combined measurements of µ_(rel,H) and K L provide the masses of the host star, M_(host) = 0.426 ± 0.037 M⊙, and planet, m_p = 3.27 ± 0.32M_(Jupiter) with a projected separation of 3.4 ± 0.5 au. This confirms the tentative conclusion of a previous paper that this super-Jupiter mass planet, OGLE-2005-BLG-071Lb, orbits an M dwarf. Such planets are predicted to be rare by the core accretion theory and have been difficult to find with other methods, but there are two such planets with firm mass measurements from microlensing, and an additional 11 planetary microlens events with host mass estimates <0. 0.5M⊙ and planet mass estimates >2 Jupiter masses that could be confirmed by high angular follow-up observations. We also point out that OGLE-2005-BLG-071L has separated far enough from its host star that it should be possible to measure the host-star metallicity with spectra from a high angular resolution telescope such as Keck, the Very Large Telescope, the Hubble Space Telescope, or the James Webb Space Telescope.

Item Type:Article
Related URLs:
URLURL TypeDescription
Bennett, David P.0000-0001-8043-8413
Beaulieu, Jean-Philippe0000-0003-0014-3354
Blackman, Joshua W.0000-0001-5860-1157
Vandorou, Aikaterini0000-0002-9881-4760
Terry, Sean K.0000-0002-5029-3257
Cole, Andrew A.0000-0003-0303-3855
Henderson, Calen B.0000-0001-8877-9060
Koshimoto, Naoki0000-0003-2302-9562
Lu, Jessica R.0000-0001-9611-0009
Ranc, Clément0000-0003-2388-4534
Udalski, Andrzej0000-0001-5207-5619
Additional Information:© 2020 The American Astronomical Society. Received 2019 September 27; revised 2019 November 25; accepted 2019 December 14; published 2020 January 23. The Keck Telescope observations and analysis were supported by a NASA Keck PI Data Award, administered by the NASA Exoplanet Science Institute. Data presented herein were obtained at the W. M. Keck Observatory from telescope time allocated to the National Aeronautics and Space Administration through the agency's scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. D.P.B. and A.B. were also supported by NASA through grant NASA-80NSSC18K0274. Some of this research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This work was supported by the University of Tasmania through the UTAS Foundation and the endowed Warren Chair in Astronomy and the ANR COLD-WORLDS (ANR-18-CE31-0002). A.U. was supported by the OGLE project funded by National Science Centre, Poland with the grant MAESTRO 2014/14/A/ST9/00121.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
University of TasmaniaUNSPECIFIED
Agence Nationale pour la Recherche (ANR)ANR-18-CE31-0002
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Subject Keywords:Exoplanets; Extrasolar gas giants; M dwarf stars
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanets (498); Extrasolar gas giants (509); M dwarf stars (982)
Record Number:CaltechAUTHORS:20200124-133035537
Persistent URL:
Official Citation:David P. Bennett et al 2020 AJ 159 68
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100902
Deposited By: Tony Diaz
Deposited On:25 Jan 2020 03:34
Last Modified:16 Nov 2021 17:57

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