Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Thomas R. Ayres"'
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:
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
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
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-10 (2018)
The Sun’s light stable isotopes compositions can help us understand how our solar system formed. Here, the authors find that solar C is depleted relative to bulk Earth indicating that the 13C enrichment of the terrestrial planets is from CO self-sh
Externí odkaz:
https://doaj.org/article/6ef1842ccedc4950a2f110582d1af63e
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
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
Autor:
Thomas R. Ayres
Publikováno v:
Fourier Transform Spectroscopy.
The FTS revolutionized many aspects of solar astronomy when introduced 20 years ago. The most profound impact was on infrared studies of molecules such as CO.
Autor:
Nicolle L. Finch, Thomas R. Ayres, S. P. Preval, Matthew Bainbridge, N. Reindl, Sarah L. Casewell, Martin A. Barstow, B. Welsh
Publikováno v:
Proceedings of the International Astronomical Union. 15:220-224
White dwarfs are useful objects with which to study the local interstellar medium (ISM). High ionisation state absorption features that cannot be attributed to the photosphere or the ISM have been observed along the line-of-sight to a number of white
Autor:
Graham M. Harper, Philip D. Bennett, Alexander Brown, Thomas R. Ayres, Keiichi Ohnaka, Elizabeth Griffin
Publikováno v:
The Astronomical Journal. 164:16
The details of the processes responsible for heating the chromospheres of evolved cool stars remain uncertain. While most spectroscopic diagnostics measure spatially-integrated emission, here we examine diagnostics sensitive to localized atmospheric
Publikováno v:
The Astrophysical Journal. 932:57
In this paper we aim to constrain the wind temperature, outflow and turbulent velocities, ionization state, and mass-loss rate of the single red giant Arcturus (α Boo K1.5 III) using high spectral resolution Hubble Space Telescope Space Telescope Im