Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b

Evan Fitzmaurice; Guđmundur Stefánsson; Robert D. Kavanagh; Suvrath Mahadevan; Caleb I. Cañas; Joshua N. Winn; Paul Robertson; Joe P. Ninan; Simon Albrecht; J. R. Callingham; William D. Cochran; Megan Delamer; Eric B. Ford; Shubham Kanodia; Andrea S. J. Lin; Marcus L. Marcussen; Benjamin J. S. Pope; Lawrence W. Ramsey; Arpita Roy; Harish Vedantham; Jason T. Wright

doi:10.3847/1538-3881/ad57be

The Astronomical Journal (Jan 2024)

Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b

Evan Fitzmaurice,
Guđmundur Stefánsson,
Robert D. Kavanagh,
Suvrath Mahadevan,
Caleb I. Cañas,
Joshua N. Winn,
Paul Robertson,
Joe P. Ninan,
Simon Albrecht,
J. R. Callingham,
William D. Cochran,
Megan Delamer,
Eric B. Ford,
Shubham Kanodia,
Andrea S. J. Lin,
Marcus L. Marcussen,
Benjamin J. S. Pope,
Lawrence W. Ramsey,
Arpita Roy,
Harish Vedantham,
Jason T. Wright

Affiliations

Evan Fitzmaurice: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA; Institute for Computational and Data Sciences, The Pennsylvania State University , University Park, PA 16802, USA
Guđmundur Stefánsson: ORCiD; 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
Robert D. Kavanagh: ORCiD; Anton Pannekoek Institute for Astronomy, University of Amsterdam , 1090 GE Amsterdam, The Netherlands; ASTRON, Netherlands Institute for Radio Astronomy , Oude Hoogeveensedijk 4, Dwingeloo, 7991 PD, The Netherlands
Suvrath Mahadevan: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA
Caleb I. Cañas: ORCiD; NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA
Joshua N. Winn: ORCiD; Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08540, USA
Paul Robertson: ORCiD; Department of Physics & Astronomy, The University of California , Irvine, Irvine, CA 92697, USA
Joe P. Ninan: ORCiD; Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , Homi Bhabha Road, Colaba, Mumbai 400005, India
Simon Albrecht: ORCiD; Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University , Ny Munkegade 120, 8000 Aarhus C, Denmark
J. R. Callingham: ORCiD; 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
William D. Cochran: ORCiD; McDonald Observatory and Department of Astronomy, The University of Texas at Austin , 2515 Speedway, Austin, TX 78712, USA; Center for Planetary Systems Habitability, The University of Texas at Austin , 2515 Speedway, Austin, TX 78712, USA
Megan Delamer: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA
Eric B. Ford: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA; Institute for Computational and Data Sciences, The Pennsylvania State University , University Park, PA 16802, USA; Center for Astrostatistics, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA
Shubham Kanodia: ORCiD; Earth and Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road, NW, Washington, DC 20015, USA
Andrea S. J. Lin: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA
Marcus L. Marcussen: ORCiD; Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University , Ny Munkegade 120, 8000 Aarhus C, Denmark
Benjamin J. S. Pope: ORCiD; School of Mathematics & Physics, University of Queensland , St Lucia, QLD 4072, Australia; Centre for Astrophysics, University of Southern Queensland , West Street, Toowoomba, QLD 4350, Australia
Lawrence W. Ramsey: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA
Arpita Roy: ORCiD; Astrophysics & Space Institute , Schmidt Sciences, New York, NY 10011, USA
Harish Vedantham: ORCiD; 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
Jason T. Wright: ORCiD; Department of Astronomy & Astrophysics, Pennsylvania State University , University Park, PA 16802, USA ; [email protected]; Center for Exoplanets and Habitable Worlds, Pennsylvania State University , University Park, PA 16802, USA; Penn State Extraterrestrial Intelligence Center, 525 Davey Laboratory, The Pennsylvania State University , University Park, PA 16802, USA

DOI: https://doi.org/10.3847/1538-3881/ad57be
Journal volume & issue: Vol. 168, no. 3
p. 140

Abstract

Read online

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.

Published in The Astronomical Journal

ISSN: 0004-6256 (Print); 1538-3881 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Astronomy
Website: https://iopscience.iop.org/journal/1538-3881

About the journal

Abstract

Keywords