Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/31415
DC Field | Value | Language |
---|---|---|
dc.contributor.author | DE LUCA, Andrea | en_US |
dc.contributor.author | STELZER, BEATE | en_US |
dc.contributor.author | Burgasser, Adam J. | en_US |
dc.contributor.author | Pizzocaro, Daniele | en_US |
dc.contributor.author | Ranalli, Piero | en_US |
dc.contributor.author | Raetz, Stefanie | en_US |
dc.contributor.author | MARELLI, MARTINO | en_US |
dc.contributor.author | Novara, Giovanni | en_US |
dc.contributor.author | VIGNALI, CRISTIAN | en_US |
dc.contributor.author | BELFIORE MONDONI, Andrea | en_US |
dc.contributor.author | ESPOSITO, PAOLO | en_US |
dc.contributor.author | FRANZETTI, PAOLO | en_US |
dc.contributor.author | FUMANA, Marco | en_US |
dc.contributor.author | GILLI, Roberto | en_US |
dc.contributor.author | SALVATERRA, Ruben | en_US |
dc.contributor.author | TIENGO, ANDREA | en_US |
dc.date.accessioned | 2022-02-18T14:05:38Z | - |
dc.date.available | 2022-02-18T14:05:38Z | - |
dc.date.issued | 2020 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31415 | - |
dc.description.abstract | We present the first detection of an X-ray flare from an ultracool dwarf of spectral class L. The event was identified in the EXTraS database of XMM-Newton variable sources, and its optical counterpart, J0331-27, was found through a cross-match with the Dark Energy Survey Year 3 release. Next to an earlier four-photon detection of Kelu-1, J0331-27 is only the second L dwarf detected in X-rays, and much more distant than other ultracool dwarfs with X-ray detections (photometric distance of 240 pc). From an optical spectrum with the VIMOS instrument at the VLT, we determine the spectral type of J0331-27 to be L1. The X-ray flare has an energy of E<SUB>X, F</SUB> ˜ 2 × 10<SUP>33</SUP> erg, placing it in the regime of superflares. No quiescent emission is detected, and from 2.5 Ms of XMM-Newton data we derive an upper limit of L<SUB>X, qui</SUB> < 10<SUP>27</SUP> erg s<SUP>-1</SUP>. The flare peak luminosity (L<SUB>X, peak</SUB> = 6.3 × 10<SUP>29</SUP> erg s<SUP>-1</SUP>), flare duration (τ<SUB>decay</SUB> ≈ 2400 s), and plasma temperature (≈16 MK) are similar to values observed in X-ray flares of M dwarfs. This shows that strong magnetic reconnection events and the ensuing plasma heating are still present even in objects with photospheres as cool as ˜2100 K. However, the absence of any other flares above the detection threshold of E<SUB>X, F</SUB> ˜ 2.5 × 10<SUP>32</SUP> erg in a total of ˜2.5 Ms of X-ray data yields a flare energy number distribution inconsistent with the canonical power law dN/dE ˜ E<SUP>-2</SUP>, suggesting that magnetic energy release in J0331-27 - and possibly in all L dwarfs - takes place predominantly in the form of giant flares. | en_US |
dc.language.iso | eng | en_US |
dc.title | EXTraS discovery of an X-ray superflare from an L dwarf | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201937163 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2020/02/aa37163-19/aa37163-19.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 634 | en_US |
dc.relation.firstpage | L13 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2020A&A...634L..13D | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.orcid | 0000-0001-6739-687X | - |
crisitem.author.orcid | 0000-0003-4929-5703 | - |
crisitem.author.orcid | 0000-0002-8017-0338 | - |
crisitem.author.orcid | 0000-0002-2526-1309 | - |
crisitem.author.orcid | 0000-0002-6986-0127 | - |
crisitem.author.orcid | 0000-0001-6787-5950 | - |
crisitem.author.orcid | 0000-0001-8121-6177 | - |
crisitem.author.orcid | 0000-0002-9393-8078 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
aa37163-19.pdf | Pdf editoriale | 231.23 kB | Adobe PDF | View/Open |
aa37163-19.pdf | postprint | 214.95 kB | Adobe PDF | View/Open |
Page view(s)
22
checked on Apr 25, 2024
Download(s)
11
checked on Apr 25, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.