Direct Radio Discovery of a Cold Brown Dwarf

Vedantham, H. K. and Callingham, J. R. and Shimwell, T. W. and Dupuy, T. and Best, William M. J. and Liu, Michael C. and Zhang, Zhoujian and De, K. and Lamy, L. and Zarka, P. and Röttgering, H. J. A. and Shulevski, A. (2020) Direct Radio Discovery of a Cold Brown Dwarf. The Astrophysical Journal, 903 (2). L33. ISSN 2041-8213

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Abstract

Magnetospheric processes seen in gas giants such as aurorae and circularly polarized cyclotron maser radio emission have been detected from some brown dwarfs. However, previous radio observations targeted known brown dwarfs discovered via their infrared emission. Here we report the discovery of BDR J1750+3809, a circularly polarized radio source detected around 144 MHz with the Low-Frequency Array (LOFAR) telescope. Follow-up near-infrared photometry and spectroscopy show that BDR J1750+3809 is a cold methane dwarf of spectral type T6.5 ± 1 at a distance of ${65}_{-8}^{+9}\,\mathrm{pc}$. The quasi-quiescent radio spectral luminosity of BDR J1750+3809 is ≈5 × 1015 erg s−1 Hz−1, which is over two orders of magnitude larger than that of the known population of comparable spectral type. This could be due to a preferential geometric alignment or an electrodynamic interaction with a close companion. In addition, as the emission is expected to occur close to the electron gyrofrequency, the magnetic field strength at the emitter site in BDR J1750+3809 is B ≳ 25 G, which is comparable to planetary-scale magnetic fields. Our discovery suggests that low-frequency radio surveys can be employed to discover substellar objects that are too cold to be detected in infrared surveys.

Item Type: Article
Subjects: Euro Archives > Physics and Astronomy
Depositing User: Managing Editor
Date Deposited: 19 May 2023 04:12
Last Modified: 10 Jan 2024 03:40
URI: http://publish7promo.com/id/eprint/2561

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