Zobrazeno 1 - 10
of 522
pro vyhledávání: '"Ilyin, A. V."'
Autor:
El-Badry, Kareem, Rix, Hans-Walter, Latham, David W., Shahaf, Sahar, Mazeh, Tsevi, Bieryla, Allyson, Buchhave, Lars A., Andrae, René, Yamaguchi, Natsuko, Isaacson, Howard, Howard, Andrew W., Savino, Alessandro, Ilyin, Ilya V.
We report discovery and spectroscopic follow-up of 21 astrometric binaries containing solar-type stars and dark companions with masses near 1.4 $M_{\odot}$. The simplest interpretation is that the companions are dormant neutron stars (NSs), though ul
Externí odkaz:
http://arxiv.org/abs/2405.00089
Autor:
El-Badry, Kareem, Simon, Joshua D., Reggiani, Henrique, Rix, Hans-Walter, Latham, David W., Bieryla, Allyson, Buchhave, Lars A., Shahaf, Sahar, Mazeh, Tsevi, Chakrabarti, Sukanya, Guhathakurta, Puragra, Ilyin, Ilya V., Tauris, Thomas M.
We report discovery and characterization of a main-sequence G star orbiting a dark object with mass $1.90\pm 0.04 M_{\odot}$. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up ov
Externí odkaz:
http://arxiv.org/abs/2402.06722
Autor:
Metcalfe, Travis S., Strassmeier, Klaus G., Ilyin, Ilya V., Buzasi, Derek, Kochukhov, Oleg, Ayres, Thomas R., Basu, Sarbani, Chontos, Ashley, Finley, Adam J., See, Victor, Stassun, Keivan G., van Saders, Jennifer L., Sepulveda, Aldo G., Ricker, George R.
Publikováno v:
Astrophys. J. 960, 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 year time ser
Externí odkaz:
http://arxiv.org/abs/2401.01944
Autor:
Metcalfe, Travis S., Buzasi, Derek, Huber, Daniel, Pinsonneault, Marc H., van Saders, Jennifer L., Ayres, Thomas R., Basu, Sarbani, Drake, Jeremy J., Egeland, Ricky, Kochukhov, Oleg, Petit, Pascal, Saar, Steven H., See, Victor, Stassun, Keivan G., Li, Yaguang, Bedding, Timothy R., Breton, Sylvain N., Finley, Adam J., Garcia, Rafael A., Kjeldsen, Hans, Nielsen, Martin B., Ong, J. M. Joel, Rorsted, Jakob L., Stokholm, Amalie, Winther, Mark L., Clark, Catherine A., Godoy-Rivera, Diego, Ilyin, Ilya V., Strassmeier, Klaus G., Jeffers, Sandra V., Marsden, Stephen C., Vidotto, Aline A., Baliunas, Sallie, Soon, Willie
Publikováno v:
Astron. J. 166, 167 (2023)
The bright star $\lambda$ Ser hosts a hot Neptune with a minimum mass of 13.6 $M_\oplus$ 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. W
Externí odkaz:
http://arxiv.org/abs/2308.09808
Publikováno v:
A&A 674, A118 (2023)
We present a magnetic-field surface map for both stellar components of the young visual binary ksi Boo AB (A: G8V, B: K5V). Employed are high resolution Stokes-V spectra obtained with the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEP
Externí odkaz:
http://arxiv.org/abs/2305.07470
Autor:
Metcalfe, Travis S., Strassmeier, Klaus G., Ilyin, Ilya V., van Saders, Jennifer L., Ayres, Thomas R., Finley, Adam J., Kochukhov, Oleg, Petit, Pascal, See, Victor, Stassun, Keivan G., Jeffers, Sandra V., Marsden, Stephen C., Morin, Julien, Vidotto, Aline A.
Publikováno v:
Astrophys. J. 948, 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:
http://arxiv.org/abs/2304.09896
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 2, Pp 93-101 (2024)
We present a scheme for modeling HF radio signal characteristics along paths of different lengths, which is based on the waveguide approach — the normal mode method. We use a representation of the recorded signal field in the form of Green function
Externí odkaz:
https://doaj.org/article/b1dd51683a4b4bf0b763b433c0a4e6b1
Autor:
Metcalfe, Travis S., Finley, Adam J., Kochukhov, Oleg, See, Victor, Ayres, Thomas R., Stassun, Keivan G., van Saders, Jennifer L., Clark, Catherine A., Godoy-Rivera, Diego, Ilyin, Ilya V., Pinsonneault, Marc H., Strassmeier, Klaus G., Petit, Pascal
Publikováno v:
Astrophys. J. 933, L17 (2022)
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:
http://arxiv.org/abs/2206.08540
Publikováno v:
Solar-Terrestrial Physics, Vol 9, Iss 4, Pp 83-94 (2023)
We present a modified method of HF radio channel modeling based on a waveguide approach. The waveguide approach represents the electromagnetic field of radiation inside the Earth—ionosphere waveguide as an eigenfunction series of a radial boundary
Externí odkaz:
https://doaj.org/article/a828da8995a947ddbeb3cc50257bc40a
Publikováno v:
Global Studies Directory: People, Organizations, Publications. 302:714-717