تقرير
Discovery of a brown dwarf with quasi-spherical mass-loss
| العنوان: | Discovery of a brown dwarf with quasi-spherical mass-loss |
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| المؤلفون: | Ruíz-Rodríguez, Dary A., Cieza, Lucas A., Casassus, Simon, Almendros-Abad, Victor, Jofré, Paula, Muzic, Koraljka, Ramirez, Karla Peña, Batalla-Falcon, Grace, Dunham, Michael M., González-Ruilova, Camilo, Hales, Antonio, Humphreys, Elizabeth, Nogueira, Pedro H., Paladini, Claudia, Tobin, John, Williams, Jonathan P., Zurlo, Alice |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | We report the serendipitous discovery of an elliptical shell of CO associated with the faint stellar object SSTc2d J163134.1-24006 as part of the "Ophiuchus Disk Survey Employing ALMA" (ODISEA), a project aiming to study the entire population of protoplanetary disks in the Ophiuchus Molecular Cloud from 230 GHz continuum emission and $^{12}$CO (J=2-1), $^{13}$CO (J=2-1) and C$^{18}$CO (J=2-1) lines readable in Band-6. Remarkably, we detect a bright $^{12}$CO elliptical shape emission of $\sim$ 3$^{"}$ $\times$ 4$^{"}$ towards SSTc2d J163134.1-24006 without a 230 GHz continuum detection. Based on the observed near-IR spectrum taken with the Very Large Telescope (KMOS), the brightness of the source, its 3-dimensional motion, and Galactic dynamic arguments, we conclude that the source is not a giant star in the distant background ($>$5 - 10 kpc) and is most likely to be a young brown dwarf in the Ophiuchus cloud, at a distance of just $\sim$139 pc. This is the first report of quasi-spherical mass loss in a young brown dwarf. We suggest that the observed shell could be associated with a thermal pulse produced by the fusion of deuterium, which is not yet well understood, but for a sub-stellar object is expected to occur during a short period of time at an age of a few Myr, in agreement with the ages of the objects in the region. Other more exotic scenarios, such as a merger with planetary companions, cannot be ruled out from the current observations. Comment: 27 pages, 20 Figures. Accepted ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ac8ff5 |
| URL الوصول: | http://arxiv.org/abs/2209.00759 |
| رقم الأكسشن: | edsarx.2209.00759 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ac8ff5 |
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