Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Jennifer L. Van Saders"'
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, Jennifer L. van Saders, Daniel Huber, Derek Buzasi, Rafael A. García, Keivan G. Stassun, Sarbani Basu, Sylvain N. Breton, Zachary R. Claytor, Enrico Corsaro, Martin B. Nielsen, J. M. Joel Ong, Nicholas Saunders, Amalie Stokholm, Timothy R. Bedding
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 31 (2024)
The solar-type subgiant β Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days. As a Southern Hemisphere target, it was not monitored by long-term s
Externí odkaz:
https://doaj.org/article/14e6e8c7daee46e38e44e35482b4bc18
Autor:
Vanshree Bhalotia, Daniel Huber, Jennifer L. van Saders, Travis S. Metcalfe, Keivan G. Stassun, Timothy R. White, Víctor Aguirre Børsen-Koch, Warrick H. Ball, Sarbani Basu, Aldo M. Serenelli, Erica Sawczynec, Joyce A. Guzik, Andrew W. Howard, Howard Isaacson
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 2, p 166 (2024)
Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in a stalled spin-down rate. How
Externí odkaz:
https://doaj.org/article/06a4a282b81a4e0695c3a216ca0e03e8
Autor:
Nicholas Saunders, Samuel K. Grunblatt, Ashley Chontos, Fei Dai, Daniel Huber, Jingwen Zhang, Guđmundur Stefánsson, Jennifer L. van Saders, Joshua N. Winn, Daniel Hey, Andrew W. Howard, Benjamin Fulton, Howard Isaacson, Corey Beard, Steven Giacalone, Judah Van Zandt, Joseph M. Akana Murphey, Malena Rice, Sarah Blunt, Emma Turtelboom, Paul A. Dalba, Jack Lubin, Casey Brinkman, Emma M. Louden, Emma Page, Cristilyn N. Watkins, Karen A. Collins, Chris Stockdale, Thiam-Guan Tan, Richard P. Schwarz, Bob Massey, Steve B. Howell, Andrew Vanderburg, George R. Ricker, Jon M. Jenkins, Sara Seager, Jessie L. Christiansen, Tansu Daylan, Ben Falk, Max Brodheim, Steven R. Gibson, Grant M. Hill, Bradford Holden, Aaron Householder, Stephen Kaye, Russ R. Laher, Kyle Lanclos, Erik A. Petigura, Arpita Roy, Ryan A. Rubenzahl, Christian Schwab, Abby P. Shaum, Martin M. Sirk, Christopher L. Smith, Josh Walawender, Sherry Yeh
Publikováno v:
The Astronomical Journal, Vol 168, Iss 2, p 81 (2024)
The degree of alignment between a star’s spin axis and the orbital plane of its planets (the stellar obliquity) is related to interesting and poorly understood processes that occur during planet formation and evolution. Hot Jupiters orbiting hot st
Externí odkaz:
https://doaj.org/article/5262b598be15457b9a2c9154dee4481f
Autor:
Tyler M. Heintz, J. J. Hermes, P.-E. Tremblay, Lou Baya Ould Rouis, Joshua S. Reding, B. C. Kaiser, Jennifer L. van Saders
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 68 (2024)
White dwarf stars have been used for decades as precise and accurate age indicators. This work presents a test of the reliability of white dwarf total ages when spectroscopic observations are available. We conduct follow-up spectroscopy of 148 indivi
Externí odkaz:
https://doaj.org/article/3bb395d332474a3c8913fcdbc83f7a76
Autor:
Nicholas Saunders, Jennifer L. van Saders, Alexander J. Lyttle, Travis S. Metcalfe, Tanda Li, Guy R. Davies, Oliver J. Hall, Warrick H. Ball, Richard Townsend, Orlagh Creevey, Curt Dodds
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 138 (2024)
Despite a growing sample of precisely measured stellar rotation periods and ages, the strength of magnetic braking and the degree of departure from standard (Skumanich-like) spin-down have remained persistent questions, particularly for stars more ev
Externí odkaz:
https://doaj.org/article/8da436d8db6b408b918184f69cf8ee7f
Autor:
Zachary R. Claytor, Jennifer L. van Saders, Lyra Cao, Marc H. Pinsonneault, Johanna Teske, Rachael L. Beaton
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 1, p 47 (2024)
The Transiting Exoplanet Survey Satellite (TESS) mission delivers time-series photometry for millions of stars across the sky, offering a probe into stellar astrophysics, including rotation, on a population scale. However, light-curve systematics rel
Externí odkaz:
https://doaj.org/article/f051ece80176451a8a73943b2c96057a
Publikováno v:
The Astrophysical Journal Letters, Vol 951, Iss 2, p L49 (2023)
Differential rotation is thought to be responsible for the dynamo process in stars like our Sun, driving magnetic activity and starspots. We report that starspot measurements in the Praesepe open cluster are strongly enhanced only for stars that depa
Externí odkaz:
https://doaj.org/article/a1f3ef419a2146b684206b49e8b9ab66
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