A Jupiter Analog Orbiting The Nearby M Dwarf GJ 463
Abstract
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.
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.Additional details
- Eprint ID
- 118002
- Resolver ID
- CaltechAUTHORS:20221122-564647900.16
- AST-1313075
- NSF
- W. M. Keck Foundation
- Created
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2022-12-06Created from EPrint's datestamp field
- Updated
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2022-12-06Created from EPrint's last_modified field
- Caltech groups
- Astronomy Department