dc.contributor.author | Burgasser, Adam J. | |
dc.contributor.author | Melis, Carl | |
dc.contributor.author | Zauderer, B | |
dc.contributor.author | Berger, Edo | |
dc.date.accessioned | 2017-02-27T15:51:09Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Burgasser, Adam J., Carl Melis, B. Ashley Zauderer, and Edo Berger. 2012. Detection of Radio Emission From the Hyperactive L Dwarf 2mass J13153094−2649513ab. The Astrophysical Journal 762, no. 1: L3. doi:10.1088/2041-8205/762/1/l3. | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:30456069 | |
dc.description.abstract | We report the detection of radio emission from the unusually active L5e + T7 binary 2MASS J13153094−2649513AB made with the Australian Telescope Compact Array. Observations at 5.5 GHz reveal an unresolved source with a continuum flux of 370±50 µJy, corresponding to a radio luminosity of Lrad = νLν = (9±3)×1023 erg s−1 and log10 Lrad/Lbol = −5.44±0.22. No detection is made at 9.0 GHz to a 5σ limit of 290 µJy, consistent with a power law spectrum Sν ∝ ν−α with α & 0.5. The emission is quiescent, with no evidence of variability or bursts over 3 hr of observation, and no measurable polarization (V/I < 34%). 2MASS J1315−2649AB is one of the most radio-luminous ultracool dwarfs detected in quiescent emission to date, comparable in strength to other cool sources detected in outburst. Its detection indicates no decline in radio flux through the mid-L dwarfs. It is unique among L dwarfs in having strong and persistent Hα and radio emission, indicating the coexistence of a cool, neutral photosphere (low electron density) and a highly active chromosphere (high electron density and active heating). These traits, coupled with the system’s mature age and substellar secondary, makes 2MASS J1315−2649AB an important test for proposed radio emission mechanisms in ultracool dwarfs. | en_US |
dc.description.sponsorship | Astronomy | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | IOP Publishing | en_US |
dc.relation.isversionof | doi:10.1088/2041-8205/762/1/l3 | en_US |
dc.relation.hasversion | https://arxiv.org/pdf/1211.3479.pdf | en_US |
dash.license | OAP | |
dc.subject | stars: chromospheres | en_US |
dc.subject | stars: individual (2MASS J13153094−2649513) | en_US |
dc.subject | stars: brown dwarfs | en_US |
dc.subject | stars: low mass | en_US |
dc.subject | stars: magnetic field | en_US |
dc.title | Detection of Radio Emission From the Hyperactive L Dwarf 2mass J13153094−2649513ab | en_US |
dc.type | Journal Article | en_US |
dc.description.version | Accepted Manuscript | en_US |
dc.relation.journal | The Astrophysical Journal | en_US |
dash.depositing.author | Berger, Edo | |
dc.date.available | 2017-02-27T15:51:09Z | |
dc.identifier.doi | 10.1088/2041-8205/762/1/l3 | * |
dash.contributor.affiliated | Zauderer, B | |
dash.contributor.affiliated | Berger, Edo | |