Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Solar analogs"'
Autor:
Kai Ikuta, Kazunari Shibata
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 1, p 50 (2024)
Flares are intense explosions on the solar and stellar surfaces, and solar flares are sometimes accompanied by filament or prominence eruptions. Recently, a large filament eruption associated with a superflare on a solar-type star EK Dra was discover
Externí odkaz:
https://doaj.org/article/3802c1bcb79e44a0a1b412d437999c76
Autor:
J.-D. do Nascimento Jr., S. A. Barnes, S. H. Saar, G. F. Porto de Mello, J. C. Hall, F. Anthony, L. de Almeida, E. N. Velloso, J. S. da Costa, P. Petit, A. Strugarek, B. J. Wargelin, M. Castro, K. G. Strassmeier, A. S. Brun
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 1, p 57 (2023)
Characterizing the cyclic magnetic activity of stars that are close approximations of our Sun offers our best hope for understanding our Sun’s current and past magnetism, the space weather around solar-type stars, and more generally, the dynamos of
Externí odkaz:
https://doaj.org/article/a40dd0cf2e10464b9ff5defe208215d2
Autor:
Jonathan P. Marshall, Steve Ertel, Francisca Kemper, Carlos del Burgo, Gilles P. P. L. Otten, Peter Scicluna, Sascha T. Zeegers, Álvaro Ribas, Oscar Morata
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 140 (2023)
ASASSN-21qj is a distant Sun-like star that recently began an episode of deep dimming events after no prior recorded variability. Here we examine archival and newly obtained optical and near-infrared data of this star. The deep aperiodic dimming and
Externí odkaz:
https://doaj.org/article/7ef46f40d2124e97b080d84696b02932
Autor:
David R. Coria, Ian J. M. Crossfield, Joshua Lothringer, Becky Flores, Nikos Prantzos, Richard Freedman
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 121 (2023)
We present the first isotopic abundances of both ^13 CO and C ^18 O in solar twin stars and test the results against several galactic chemical evolution (GCE) models with different nucleosynthesis prescriptions. First, we compare M -band spectra from
Externí odkaz:
https://doaj.org/article/9fe97d07087c4395894642df71ea9c7f
Autor:
Maria Korolik, Rachael M. Roettenbacher, Debra A. Fischer, Stephen R. Kane, Jean M. Perkins, John D. Monnier, Claire L. Davies, Stefan Kraus, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Tyler Gardner, Cyprien Lanthermann, Gail H. Schaefer, Benjamin Setterholm, John M. Brewer, Joe Llama, Lily L. Zhao, Andrew E. Szymkowiak, Gregory W. Henry
Publikováno v:
The Astronomical Journal, Vol 166, Iss 3, p 123 (2023)
To accurately characterize the planets a star may be hosting, stellar parameters must first be well determined. τ Ceti is a nearby solar analog and often a target for exoplanet searches. Uncertainties in the observed rotational velocities have made
Externí odkaz:
https://doaj.org/article/cf4cc984c0834b77b117b95dcc6851ce
Autor:
John M. Brewer, Lily L. Zhao, Debra A. Fischer, Rachael M. Roettenbacher, Gregory W. Henry, Joe Llama, Andrew E. Szymkowiak, Samuel H. C. Cabot, Sam A. Weiss, Chris McCarthy
Publikováno v:
The Astronomical Journal, Vol 166, Iss 2, p 46 (2023)
Thousands of exoplanet detections have been made over the last 25 years using Doppler observations, transit photometry, direct imaging, and astrometry. Each of these methods is sensitive to different ranges of orbital separations and planetary radii
Externí odkaz:
https://doaj.org/article/4812accc16c542229b2fa2c87dcf3f5c
Autor:
Kenji Hamaguchi, Jeffrey W. Reep, Vladimir Airapetian, Shin Toriumi, Keith C. Gendreau, Zaven Arzoumanian
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 2, p 163 (2023)
The Neutron star Interior Composition Explorer (NICER) X-ray observatory observed two powerful X-ray flares equivalent to superflares from the nearby young solar-like star κ ^1 Ceti in 2019. NICER follows each flare from the onset through the early
Externí odkaz:
https://doaj.org/article/acd47f75597f4abe99a70eeaf07666dc
Autor:
Namekata, Kosuke, Maehara, Hiroyuki, Honda, Satoshi, Notsu, Yuta, Nogami, Daisaku, Shibata, Kazunari
We report that our optical spectroscopic observation of the young solar-type star EK Draconis reveals the first evidence for a stellar filament eruption associated with a superflare on a young Sun-like star EK Draconis. We monitored EK Draconis for a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ee1c30cddb9cb9a71321f9f21415b12
Autor:
Metcalfe, Travis S., Finley, Adam, Kochukhov, Oleg, See, Victor, Ayres, Thomas, Stassun, Keivan, van Saders, Jennifer, Clark, Catherine, Godoy-Rivera, Diego, Ilyin, Ilya, Pinsonneault, Marc, Strassmeier, Klaus, Petit, Pascal
The rotation rates of main-sequence stars slow over time as they gradually lose angular momentum to their magnetized stellar winds. The rate of angular momentum loss depends on the strength and morphology of the magnetic field, the mass-loss rate, an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f38a52b6f5704590e547f06a320f17d
The Sun and Sun-like stars commonly host the multi-million-K corona and the 10,000-K chromosphere. Because these extremely hot gases generate X-ray and extreme ultraviolet (XUV) emissions that may impact the erosion and chemistry of (exo)planetary at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e03bf62d60396c400523de5b950856e