Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30635
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Argiroffi, Costanza | en_US |
dc.contributor.author | Reale, Fabio | en_US |
dc.contributor.author | Drake, J. J. | en_US |
dc.contributor.author | CIARAVELLA, Angela | en_US |
dc.contributor.author | Testa, P. | en_US |
dc.contributor.author | Bonito, Rosaria | en_US |
dc.contributor.author | Miceli, Marco | en_US |
dc.contributor.author | ORLANDO, Salvatore | en_US |
dc.contributor.author | Peres, Giovanni | en_US |
dc.date.accessioned | 2021-02-26T10:01:06Z | - |
dc.date.available | 2021-02-26T10:01:06Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 2397-3366 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30635 | - |
dc.description.abstract | Coronal mass ejections (CMEs), often associated with flares<SUP>1-3</SUP>, are the most powerful magnetic phenomena occurring on the Sun. Stars show magnetic activity levels up to ten thousand times higher<SUP>4</SUP>, and CME effects on stellar physics and circumstellar environments are predicted to be substantial<SUP>5-9</SUP>. However, stellar CMEs remain observationally unexplored. Using time-resolved high-resolution X-ray spectroscopy of a stellar flare on the active star HR 9024 observed with the High Energy Transmission Grating Spectrometer onboard the Chandra X-ray Observatory space telescope, we distinctly detected Doppler shifts in S xvi, Si xiv and Mg xii lines that indicate upward and downward motions of hot plasmas (around 10-25 MK) within the flaring loop, with velocities of 100-400 km s<SUP>-1</SUP>, in agreement with a model of a flaring magnetic tube. Most notably, we also detected a later blueshift in the O viii line that reveals an upward motion, with velocity 90 ± 30 km s<SUP>-1</SUP>, of cool plasma (about 4 MK), that we ascribe to a CME coupled to the flare. From this evidence we were able to derive a CME mass of 1 .2<SUB>-0.8</SUB><SUP>+2.6</SUP>×1 0<SUP>21</SUP> g and a CME kinetic energy of 5 .2<SUB>-3.6</SUB><SUP>+27.7</SUP>×1 0<SUP>34</SUP> erg. These values provide clues in the extrapolation of the solar case to higher activity levels in other stars, suggesting that CMEs could indeed be a major cause of mass and angular momentum loss. | en_US |
dc.language.iso | eng | en_US |
dc.title | A stellar flare-coronal mass ejection event revealed by X-ray plasma motions | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1038/s41550-019-0781-4 | en_US |
dc.identifier.scopus | 2-s2.0-85070391681 | en_US |
dc.identifier.isi | 000479146100018 | en_US |
dc.identifier.url | https://www.nature.com/articles/s41550-019-0781-4 | en_US |
dc.relation.medium | ELETTRONICO | en_US |
dc.relation.volume | 3 | en_US |
dc.relation.firstpage | 742 | en_US |
dc.relation.numberofpages | 7 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 9 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | NATURE ASTRONOMY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2019NatAs...3..742A | 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 | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.orcid | 0000-0003-2073-1348 | - |
crisitem.author.orcid | 0000-0002-1820-4824 | - |
crisitem.author.orcid | 0000-0002-3127-8078 | - |
crisitem.author.orcid | 0000-0001-9297-7748 | - |
crisitem.author.orcid | 0000-0003-0876-8391 | - |
crisitem.author.orcid | 0000-0003-2836-540X | - |
crisitem.author.orcid | 0000-0002-6033-8180 | - |
crisitem.journal.journalissn | 2397-3366 | - |
crisitem.journal.ance | E240167 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
argiroffi2019_postprint.pdf | postprint | 2.9 MB | Adobe PDF | View/Open |
argiroffi21019_pdfeditoriale.pdf | [Administrators only] | 3.42 MB | Adobe PDF |
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