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A Jupiter Analog Orbiting The Nearby M Dwarf GJ 463

Endl, Michael and Robertson, Paul and Cochran, William D. and MacQueen, Phillip J. and Bowler, Brendan P. and Franson, Kyle E. and Holcomb, Rae and Beard, Corey and Isaacson, Howard and Howard, Andrew W. and Lubin, Jack (2022) A Jupiter Analog Orbiting The Nearby M Dwarf GJ 463. Astronomical Journal, 164 (6). Art. No. 238. ISSN 0004-6256. doi:10.3847/1538-3881/ac8e05.

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We report the detection of a long-period giant planetary companion to the nearby M3V star GJ 463 (=Ross 690). The detection is based on over ten years of highly-precise radial velocity measurements with the High Resolution Spectrograph at the Hobby–Eberly Telescope and the HIRES spectrograph at Keck. With an orbital period of 10 yr and a minimum mass of 1.55 ± 0.15 M_(Jup), GJ 463 b has a comparable orbital period to Jupiter and hence qualifies as a Jupiter analog around a low-mass star. We demonstrate that the radial velocity signal is not produced by a magnetic activity cycle of the host star. GJ 463 was observed with TESS, and we searched the light curve for any possible signals of stellar or planetary origin, but detected none. This planet is a candidate for possible direct detection with the coronagraph of the upcoming Nancy Grace Roman Space Telescope. We compared Gaia EDR3 with Hipparcos astrometry and detected a significant acceleration, which is likely caused by this long-period planetary companion at a = 3.53 ± 0.07 au.

Item Type:Article
Related URLs:
URLURL TypeDescription
Endl, Michael0000-0002-7714-6310
Robertson, Paul0000-0003-0149-9678
Cochran, William D.0000-0001-9662-3496
Bowler, Brendan P.0000-0003-2649-2288
Franson, Kyle E.0000-0003-4557-414X
Holcomb, Rae0000-0002-5034-9476
Beard, Corey0000-0001-7708-2364
Isaacson, Howard0000-0002-0531-1073
Howard, Andrew W.0000-0001-8638-0320
Lubin, Jack0000-0001-8342-7736
Additional Information:The McDonald Observatory planet search was supported by the National Science Foundation through grant AST-1313075 and by various NASA XRP grants. We would like to thank the HET TAC for its constant support to the M-dwarf planet search from 2008 to 2013 (when HRS was taken offline for the HETDEX upgrade). The Keck/HIRES data were obtained through the NASA key science project to support the CoRoT mission. The most recent HIRES spectra were taken in collaboration with the California planet search program. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Astronomy Department
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20221122-564647900.16
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118002
Deposited By: Research Services Depository
Deposited On:06 Dec 2022 00:49
Last Modified:06 Dec 2022 17:23

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