Direct radio discovery of a cold brown dwarf
| العنوان: | Direct radio discovery of a cold brown dwarf |
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| المؤلفون: | Zhoujian Zhang, Philippe Zarka, Joseph R. Callingham, L. Lamy, Aleksandar Shulevski, Timothy W. Shimwell, H. J. A. Röttgering, William M. J. Best, Kaushik De, Harish Vedantham, Michael C. Liu, Trent J. Dupuy |
| المساهمون: | Astronomy, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
| المصدر: | Vedantham, H K, Callingham, J R, Shimwell, T W, Dupuy, T, Best, W M J, Liu, M C, Zhang, Z, De, K, Lamy, L, Zarka, P, Rottgering, H J A & Shulevski, A 2020, ' Direct radio discovery of a cold brown dwarf ', Astrophysical Journal Letters, vol. 903, no. L33, pp. 1-13 . https://doi.org/10.3847/2041-8213/abc256 Astrophysical Journal Letters, 903(2):33. IOP PUBLISHING LTD The Astrophysical journal letters The Astrophysical journal letters, Bristol : IOP Publishing, 2020, 903 (2), pp.L33. ⟨10.3847/2041-8213/abc256⟩ The Astrophysical Journal Letters, 903(2), L33 |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | ELECTRON-CYCLOTRON MASER, astro-ph.SR, 010504 meteorology & atmospheric sciences, IMAGER, Astrophysics::High Energy Astrophysical Phenomena, Population, Brown dwarf, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Stellar classification, 01 natural sciences, T-DWARFS, law.invention, Luminosity, law, SEARCH, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Maser, education, Spectroscopy, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, SPECTRAL CLASSIFICATION, 0105 earth and related environmental sciences, Physics, [PHYS]Physics [physics], Earth and Planetary Astrophysics (astro-ph.EP), education.field_of_study, CONSTRAINTS, Astronomy and Astrophysics, LOFAR, Photometry (astronomy), DEFINITION, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, ALL-SKY SURVEY, astro-ph.EP, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], EMISSION, Astrophysics - Earth and Planetary Astrophysics, PLANETS |
| الوصف: | 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 LOFAR telescope. Follow-up near-infrared photometry and spectroscopy show that BDR J1750+3809 is a cold methane dwarf of spectral type T$6.5\pm 1$ at a distance of $65^{+9}_{-8}\,{\rm pc}$. The quasi-quiescent radio spectral luminosity of BDR J1750+3809 is $\approx 5\times 10^{15}\,{\rm erg}\,{\rm s}^{-1}\,{\rm Hz}^{-1}$ 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 gyro-frequency, the magnetic field strength at the emitter site in BDR J1750+3809 is $B\gtrsim 25\,{\rm G}$, which is comparable to planetary-scale magnetic fields. Our discovery suggests that low-frequency radio surveys can be employed to discover sub-stellar objects that are too cold to be detected in infrared surveys. Comment: Accepted for publication in ApJL |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2041-8205 2041-8213 |
| DOI: | 10.3847/2041-8213/abc256 |
| DOI: | 10.3847/2041-8213/abc256⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd28afcd433bf0b082367c279c8b0975 https://hdl.handle.net/1887/3133590 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....bd28afcd433bf0b082367c279c8b0975 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20418205 20418213 |
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| DOI: | 10.3847/2041-8213/abc256 |