Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b
Article
Fitzmaurice, Evan, Stefánsson, Guđmundur, Kavanagh, Robert D., Mahadevan, Suvrath, Cañas, Caleb I., Winn, Joshua N., Robertson, Paul, Ninan, Joe P., Albrecht, Simon, Callingham, J. R., Cochran, William D., Delamer, Megan, Ford, , Eric B., Kanodia, Shubham, Lin, Andrea S. J., Marcussen, Marcus L., Pope, Benjamin J. S., Ramsey, Lawrence W., Roy, Arpita, ..., Wright, Jason T.. 2024. "Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b." The Astronomical Journal. 168 (3). https://doi.org/10.3847/1538-3881/ad57be
Article Title | Astrometry and Precise Radial Velocities Yield a Complete Orbital Solution for the Nearby Eccentric Brown Dwarf LHS 1610 b |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Fitzmaurice, Evan, Stefánsson, Guđmundur, Kavanagh, Robert D., Mahadevan, Suvrath, Cañas, Caleb I., Winn, Joshua N., Robertson, Paul, Ninan, Joe P., Albrecht, Simon, Callingham, J. R., Cochran, William D., Delamer, Megan, Ford, , Eric B., Kanodia, Shubham, Lin, Andrea S. J., Marcussen, Marcus L., Pope, Benjamin J. S., Ramsey, Lawrence W., Roy, Arpita, Vedantham, Harish and Wright, Jason T. |
Journal Title | The Astronomical Journal |
Journal Citation | 168 (3) |
Article Number | 140 |
Number of Pages | 21 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad57be |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad57be |
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. © 2024. The Author(s). Published by the American Astronomical Society. |
Keywords | Radial velocity; Brown dwarfs; Low mass stars; Astrometry |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | Pennsylvania State University, United States |
University of Amsterdam, Netherlands | |
Princeton University, United States | |
Netherlands Institute for Radio Astronomy, Netherlands | |
NASA Goddard Space Flight Center, United States | |
University of California Irvine, United States | |
Tata Institute of Fundamental Research, India | |
Aarhus University, Denmark | |
Leiden University, Netherlands | |
University of Texas at Austin, United States | |
Carnegie Institution for Science, United States | |
Centre for Astrophysics | |
School of Mathematics, Physics and Computing | |
Astrophysics & Space Institute, United States | |
University of Groningen, Netherlands |
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