Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b
Abstract
The LHS 1610 system consists of a nearby ($d=9.7$ pc) M5 dwarf hosting a candidate brown dwarf companion in a $10.6$ day, eccentric ($e \sim 0.37$) orbit. We confirm this brown dwarf designation and estimate its mass ($ 49.5_{-3.5}^{+4.3}$ $M_{\text{Jup}} $) and inclination ($ 114.5^\circ$ $_{-10.0}^{+7.4}$) by combining discovery radial velocities (RVs) from TRES 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 ($e=0.52 \pm 0.03$) and the RV-only solution ($e=0.3702\pm0.0003$). We discuss possible reasons for this discrepancy, which can be further probed when the Gaia astrometric time series becomes available as part of Gaia DR4. 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 ($0.28\pm 0.07$ flares/day) on the higher-end for its rotation period ($84 \pm 8$ 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 TESS 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 20
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Affiliation as printed
The Pennsylvania State University , University Park , PA , 16802 , 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
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Affiliation as printed
Department of Astrophysical Sciences , Princeton University , 4 Ivy Lane , Princeton , NJ 08540 , 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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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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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
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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
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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
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Schmidt Sciences · The University of Texas at Austin
Affiliation as printed
Astrophysics & Space Institute , Schmidt Sciences , New York , NY 10011 , USA
Department of Astronomy , The University of Texas at Austin , 2515 Speedway , Austin , TX 78712 , 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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