K2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4
| dc.contributor.author | Paudel, Rishi R. | |
| dc.contributor.author | Gizis, John E. | |
| dc.contributor.author | Mullan, D. J. | |
| dc.contributor.author | Schmidt, Sarah J. | |
| dc.contributor.author | Burgasser, Adam J. | |
| dc.contributor.author | Williams, Peter K. G. | |
| dc.contributor.author | Berger, Edo | |
| dc.date.accessioned | 2022-02-09T15:26:22Z | |
| dc.date.available | 2022-02-09T15:26:22Z | |
| dc.date.issued | 2018-05-28 | |
| dc.description.abstract | We present photometric measurements of two superflares observed on a very young brown dwarf CFHT-BD-Tau 4, observed during Campaign 13 of the Kepler K2 mission. The stronger of the two superflares brightened by a factor of ~48 relative to the quiescent photospheric level, with an increase in Kepler magnitude ΔK~p = -4.20. It has an equivalent duration of ~107 hour, a flare duration of 1.7 day, and an estimated total bolometric (ultraviolet/optical/infrared) energy up to 2.1 ✕10³⁸ erg. The weaker of the two superflares is a complex (multipeaked) flare with an estimated total bolometric (UV/optical/IR) energy up to 4.7 ✕10³⁶ erg. They are the strongest flares observed on any brown dwarf so far. The flare energies are strongly dependent on the value of visual extinction parameter Aᵥ used for extinction correction. If we apply a solar flare-model to interpret the two superflares, we fi nd that the magnetic fi elds are required to be stronger by as much as an order of magnitude than previous reports of fi eld measurements in CFHT-BD-Tau 4 by Reiners et al. (2009b). On the other hand, if we interpret our data in terms of accretion, we find that the requisite rate of accretion for the stronger superflare exceeds the rates which have been reported for other young brown dwarfs. | en_US |
| dc.description.sponsorship | We are thankful to Zhoujian Zhang for providing us the results of his paper. This paper makes use of data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission derectorate. The material is based upon work supported by NASA under award Nos. NNX15AV64G, NNX16AE55G and NNX16AJ22G. P.K.G.W. and E.B. acknowledge support for this work from the National Science Foundation through Grant AST-1614770. Some/all of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. This publication also makes use of data from the Sloan Digital Sky Survey. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for HighPerformance Computing at the University of Utah. The SDSS web site is www.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration, which can be found at http://www.sdss.org/collaboration/affiliations/. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos. esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www. cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This work made use of the http://gaia-kepler.fun crossmatch database created by Megan Bedell. | en_US |
| dc.description.uri | https://arxiv.org/abs/1805.11185 | en_US |
| dc.format.extent | 10 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.genre | preprints | en_US |
| dc.identifier | doi:10.13016/m2yylj-u2jg | |
| dc.identifier.citation | Paudel, Rishi R. et al. K2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4. The Astrophysical Journal 861 (July 6, 2018), no. 2. https://doi.org/10.3847/1538-4357/aac8e0. | en_US |
| dc.identifier.uri | https://arxiv.org/ct?url=https%3A%2F%2Fdx.doi.org%2F10.3847%2F1538-4357%2Faac8e0&v=68a8c16d | |
| dc.identifier.uri | http://hdl.handle.net/11603/24159 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | IOP | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.rights | © 2018. The American Astronomical Society. All rights reserved | en_US |
| dc.title | K2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4 | en_US |
| dc.type | Text | en_US |
| dcterms.creator | https://orcid.org/0000-0002-8090-3570 | en_US |