Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b
The Astronomical Journal, vol. 168, pp. 140
Abstract
Abstract The LHS 1610 system consists of a nearby (d = 9.7 pc) M5 dwarf hosting a candidate brown dwarf companion in a 10.6 days, eccentric (e ∼ 0.37) orbit. We confirm this brown dwarf designation and estimate its mass ( 49.5 − 3.5 + 4.3 M Jup) and inclination (114.5° − 10.0 + 7.4 ) by combining discovery radial velocities (RVs) from the Tillinghast Reflector Echelle Spectrograph and new RVs from the Habitable-zone Planet Finder with the available Gaia astrometric two-body solution. We highlight a discrepancy between the measurement of the eccentricity from the Gaia two-body solution (e = 0.52 ± 0.03) and the RV-only solution (e = 0.3702 ± 0.0003). We discuss possible reasons for this discrepancy, which can be further probed when the Gaia astrometric time series become available as part of Gaia Data Release 4. As a nearby mid-M star hosting a massive short-period companion with a well-characterized orbit, LHS 1610 b is a promising target to look for evidence of sub-Alfvénic interactions and/or auroral emission at optical and radio wavelengths. LHS 1610 has a flare rate (0.28 ± 0.07 flares per day) on the higher end for its rotation period (84 ± 8 days), similar to other mid-M dwarf systems such as Proxima Cen and YZ Ceti that have recent radio detections compatible with star–planet interactions. While available Transiting Exoplanet Survey Satellite photometry is insufficient to determine an orbital phase dependence of the flares, our complete orbital characterization of this system makes it attractive to probe star–companion interactions with additional photometric and radio observations.
Authors 21
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Affiliation as printed
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Institute for Computational and Data Sciences, The Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
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Princeton University · University of Amsterdam
Affiliation as printed
Anton Pannekoek Institute for Astronomy, University of Amsterdam, 1090 GE Amsterdam, The Netherlands
Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08540, USA
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University of Amsterdam · Netherlands Institute for Radio Astronomy
Affiliation as printed
ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, Dwingeloo, 7991 PD, The Netherlands
Anton Pannekoek Institute for Astronomy, University of Amsterdam, 1090 GE Amsterdam, The Netherlands
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Affiliation as printed
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
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Affiliation as printed
NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
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Affiliation as printed
Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08540, USA
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University of California, Irvine
Affiliation as printed
Department of Physics & Astronomy, The University of California, Irvine, Irvine, CA 92697, USA
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Tata Institute of Fundamental Research
Affiliation as printed
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
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Affiliation as printed
Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Leiden University · Leiden Observatory · Netherlands Institute for Radio Astronomy
Affiliation as printed
ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, Dwingeloo, 7991 PD, The Netherlands
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands
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The University of Texas at Austin
Affiliation as printed
Center for Planetary Systems Habitability, The University of Texas at Austin, 2515 Speedway, Austin, TX 78712, USA
McDonald Observatory and Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Austin, TX 78712, USA
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Affiliation as printed
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
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Affiliation as printed
Center for Astrostatistics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Institute for Computational and Data Sciences, The Pennsylvania State University, University Park, PA 16802, USA
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Carnegie Institution for Science · Earth and Planets Laboratory
Affiliation as printed
Earth and Planets Laboratory, Carnegie Institution for Science, 5241 Broad Branch Road, NW, Washington, DC 20015, USA
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Affiliation as printed
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
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Affiliation as printed
Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
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The University of Queensland · University of Southern Queensland
Affiliation as printed
Centre for Astrophysics, University of Southern Queensland, West Street, Toowoomba, QLD 4350, Australia
School of Mathematics & Physics, University of Queensland, St Lucia, QLD 4072, Australia
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Affiliation as printed
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
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Affiliation as printed
Astrophysics & Space Institute, Schmidt Sciences, New York, NY 10011, USA
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University of Groningen · Netherlands Institute for Radio Astronomy
Affiliation as printed
ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, Dwingeloo, 7991 PD, The Netherlands
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, NL-9747AD Groningen, The Netherlands
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Affiliation as printed
Center for Exoplanets and Habitable Worlds, Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; exf5296@psu.edu
Penn State Extraterrestrial Intelligence Center, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
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