Zobrazeno 1 - 10
of 234
pro vyhledávání: '"Oleg Kochukhov"'
Autor:
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin, Derek Buzasi, Oleg Kochukhov, Thomas R. Ayres, Sarbani Basu, Ashley Chontos, Adam J. Finley, Victor See, Keivan G. Stassun, Jennifer L. van Saders, Aldo G. Sepulveda, George R. Ricker
Publikováno v:
The Astrophysical Journal Letters, Vol 960, Iss 1, p L6 (2024)
The consistently low activity level of the old solar analog 51 Peg not only facilitated the discovery of the first hot Jupiter, but also led to the suggestion that the star could be experiencing a magnetic grand minimum. However, the 50 yr time serie
Externí odkaz:
https://doaj.org/article/be59577f1d4549889d6d5c21333540b7
Autor:
Elisa Goffo, Davide Gandolfi, Jo Ann Egger, Alexander J. Mustill, Simon H. Albrecht, Teruyuki Hirano, Oleg Kochukhov, Nicola Astudillo-Defru, Oscar Barragan, Luisa M. Serrano, Artie P. Hatzes, Yann Alibert, Eike Guenther, Fei Dai, Kristine W. F. Lam, Szilárd Csizmadia, Alexis M. S. Smith, Luca Fossati, Rafael Luque, Florian Rodler, Mark L. Winther, Jakob L. Rørsted, Javier Alarcon, Xavier Bonfils, William D. Cochran, Hans J. Deeg, Jon M. Jenkins, Judith Korth, John H. Livingston, Annabella Meech, Felipe Murgas, Jaume Orell-Miquel, Hannah L. M. Osborne, Enric Palle, Carina M. Persson, Seth Redfield, George R. Ricker, Sara Seager, Roland Vanderspek, Vincent Van Eylen, Joshua N. Winn
Publikováno v:
The Astrophysical Journal Letters, Vol 955, Iss 1, p L3 (2023)
GJ 367 is a bright ( V ≈ 10.2) M1 V star that has been recently found to host a transiting ultra-short period sub-Earth on a 7.7 hr orbit. With the aim of improving the planetary mass and radius and unveiling the inner architecture of the system, w
Externí odkaz:
https://doaj.org/article/bb6730c7cc8945ababadf5fa74fd3d78
Autor:
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin, Jennifer L. van Saders, Thomas R. Ayres, Adam J. Finley, Oleg Kochukhov, Pascal Petit, Victor See, Keivan G. Stassun, Sandra V. Jeffers, Stephen C. Marsden, Julien Morin, Aline A. Vidotto
Publikováno v:
The Astrophysical Journal Letters, Vol 948, Iss 1, p L6 (2023)
During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking. Recent observations suggest a substantial decrease in the magnetic braking efficiency when sta
Externí odkaz:
https://doaj.org/article/a3a09f0e714f4e8ebaaae620aaaee3dd
Publikováno v:
The Open Journal of Astrophysics, Vol 5, Iss 1 (2022)
Externí odkaz:
https://doaj.org/article/fec95e0a8f36447eb224981d71827f7e
Autor:
Engin Bahar, Hakan V. Şenavcı, Emre Işık, Gaitee A. J. Hussain, Oleg Kochukhov, David Montes, Yue Xiang
Publikováno v:
The Astrophysical Journal, Vol 960, Iss 1, p 60 (2023)
Measuring the coverage of dark spots on cool stars is important to understanding how stellar magnetic activity scales with the rotation rate and convection zone depth. In this respect, it is crucial to infer surface magnetic patterns on G and K stars
Externí odkaz:
https://doaj.org/article/819729f6e8cc4327a4c86c1536a9f5c6
Autor:
Travis S. Metcalfe, Derek Buzasi, Daniel Huber, Marc H. Pinsonneault, Jennifer L. van Saders, Thomas R. Ayres, Sarbani Basu, Jeremy J. Drake, Ricky Egeland, Oleg Kochukhov, Pascal Petit, Steven H. Saar, Victor See, Keivan G. Stassun, Yaguang Li, Timothy R. Bedding, Sylvain N. Breton, Adam J. Finley, Rafael A. García, Hans Kjeldsen, Martin B. Nielsen, J. M. Joel Ong, Jakob L. Rørsted, Amalie Stokholm, Mark L. Winther, Catherine A. Clark, Diego Godoy-Rivera, Ilya V. Ilyin, Klaus G. Strassmeier, Sandra V. Jeffers, Stephen C. Marsden, Aline A. Vidotto, Sallie Baliunas, Willie Soon
Publikováno v:
The Astronomical Journal, Vol 166, Iss 4, p 167 (2023)
The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M _⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun. We aim to ch
Externí odkaz:
https://doaj.org/article/cb097db1977143629195bc3f6d94b093
Autor:
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin, Jennifer L. van Saders, Thomas R. Ayres, Adam J. Finley, Oleg Kochukhov, Pascal Petit, Victor See, Keivan G. Stassun, Sandra V. Jeffers, Stephen C. Marsden, Julien Morin, Aline A. Vidotto
During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking. Recent observations suggest a substantial decrease in the magnetic braking efficiency when sta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a08571e2bd1533bae076ec6280203731
http://arxiv.org/abs/2304.09896
http://arxiv.org/abs/2304.09896
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 502:5200-5209
$\tau^{9}$ Eri is a Bp star that was previously reported to be a single-lined spectroscopic binary. Using 17 ESPaDOnS spectropolarimetric (Stokes $V$) observations we identified the weak spectral lines of the secondary component and detected a strong
Autor:
Travis S. Metcalfe, Adam J. Finley, Oleg Kochukhov, Victor See, Thomas R. Ayres, Keivan G. Stassun, Jennifer L. van Saders, Catherine A. Clark, Diego Godoy-Rivera, Ilya V. Ilyin, Marc H. Pinsonneault, Klaus G. Strassmeier, Pascal Petit
Publikováno v:
The Astrophysical Journal Letters
The Astrophysical Journal Letters, 2022, 933, ⟨10.3847/2041-8213/ac794d⟩
The Astrophysical Journal Letters, 2022, 933, ⟨10.3847/2041-8213/ac794d⟩
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___::f1a3585a0b9440c81c309456b7e13588
https://insu.hal.science/insu-03745323
https://insu.hal.science/insu-03745323
Simulating the Space Weather in the AU Mic System : Stellar Winds and Extreme Coronal Mass Ejections
Autor:
Julián D. Alvarado-Gómez, Ofer Cohen, Jeremy J. Drake, Federico Fraschetti, Katja Poppenhaeger, Cecilia Garraffo, Judy Chebly, Ekaterina Ilin, Laura Harbach, Oleg Kochukhov
Two close-in planets have been recently found around the M-dwarf flare star AU Microscopii (AU Mic). These Neptune-sized planets (AU Mic b and c) seem to be located very close to the so-called "evaporation valley" in the exoplanet population, making
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a959770e8d0e5eea1a42071215695a7
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-473143
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-473143