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Published April 20, 2007 | Published
Journal Article Open

Ophiuchus 1622–2405: Not a Planetary-Mass Binary

Abstract

We present an analysis of the mass and age of the young low-mass binary Oph 1622-2405. Using resolved optical spectroscopy of the binary, we measure spectral types of M7.25 ± 0.25 and M8.75 ± 0.25 for the A and B components, respectively. We show that our spectra are inconsistent with the spectral types of M9 and M9.5-L0 from Jayawardhana & Ivanov and M9 ± 0.5 and M9.5 ± 0.5 from Close and coworkers. Based on our spectral types and the theoretical evolutionary models of Chabrier and Baraffe, we estimate masses of ~0.055 and ~0.019 M_⊙ for Oph 1622-2405A and B, which are significantly higher than the values of 0.013 and 0.007 M_⊙ derived by Jayawardhana & Ivanov and above the range of masses observed for extrasolar planets (M ≾ 0.015 M_⊙). Planet-like mass estimates are further contradicted by our demonstration that Oph 1622-2405A is only slightly later (by 0.5 subclass) than the composite of the young eclipsing binary brown dwarf 2M 0535-0546, whose components have dynamical masses of 0.034 and 0.054 M_⊙. To constrain the age of Oph 1622-2405, we compare the strengths of gravity-sensitive absorption lines in optical and near-infrared spectra of the primary to lines in field dwarfs (τ > 1 Gyr) and members of Taurus (τ ~ 1 Myr) and Upper Scorpius (τ ~ 5 Myr). The line strengths for Oph 1622-2405A are inconsistent with membership in Ophiuchus (τ < 1 Myr) and instead indicate an age similar to that of Upper Sco, which is in agreement with a similar analysis performed by Close and coworkers. We conclude that Oph 1622-2405 is part of an older population in Sco-Cen, perhaps Upper Sco itself.

Additional Information

© 2007 American Astronomical Society. Received 2006 August 29, accepted for publication 2007 January 8. We thank Davy Kirkpatrick for providing his spectrum of 2M J0141-4633 and Laird Close for providing his results prior to publication. K. L. was supported by grant AST-0544588 from the National Science Foundation. We thank Ivelive Momcheva for providing the telescope time for the LDSS-3 observations of Oph 1622-2405. This work is supported by NASA through the Spitzer Space Telescope Fellowship Program, through a contract issued by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.

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August 22, 2023
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