Search Results - "Davies, Guy R."

A new method for the asteroseismic determination of the evolutionary state of red-giant stars by Elsworth, Yvonne, Hekker, Saskia, Basu, Sarbani, R. Davies, Guy

“…Abstract Determining the ages of red-giant stars is a key problem in stellar astrophysics. One of the difficulties in this determination is to know the…”
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Weakened magnetic braking as the origin of anomalously rapid rotation in old field stars by van Saders, Jennifer L., Ceillier, Tugdual, Metcalfe, Travis S., Aguirre, Victor Silva, Pinsonneault, Marc H., García, Rafael A., Mathur, Savita, Davies, Guy R.

“…The age of a young to middle-aged star can be determined from how quickly or slowly it rotates, but the relationship breaks down for old stars; models now show…”
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aims – a new tool for stellar parameter determinations using asteroseismic constraints by Rendle, Ben M, Buldgen, Gaël, Miglio, Andrea, Reese, Daniel, Noels, Arlette, Davies, Guy R, Campante, Tiago L, Chaplin, William J, Lund, Mikkel N, Kuszlewicz, James S, Scott, Laura J A, Scuflaire, Richard, Ball, Warrick H, Smetana, Jiri, Nsamba, Benard

“…A key aspect in the determination of stellar properties is the comparison of observational constraints with predictions from stellar models. Asteroseismic…”
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Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. I. Oscillation Mode Parameters by Lund, Mikkel N., Aguirre, Víctor Silva, Davies, Guy R., Chaplin, William J., Christensen-Dalsgaard, Jørgen, Houdek, Günter, White, Timothy R., Bedding, Timothy R., Ball, Warrick H., Huber, Daniel, Antia, H. M., Lebreton, Yveline, Latham, David W., Handberg, Rasmus, Verma, Kuldeep, Basu, Sarbani, Casagrande, Luca, Justesen, Anders B., Kjeldsen, Hans, Mosumgaard, Jakob R.

“…The advent of space-based missions like Kepler has revolutionized the study of solar-type stars, particularly through the measurement and modeling of their…”
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The Red-giant Branch Bump Revisited: Constraints on Envelope Overshooting in a Wide Range of Masses and Metallicities by Khan, Saniya, Hall, Oliver J., Miglio, Andrea, Davies, Guy R., Mosser, Benoît, Girardi, Léo, Montalbán, Josefina

“…The red-giant branch bump provides valuable information for the investigation of the internal structure of low-mass stars. Because current models are unable to…”
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The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity by Karoff, Christoffer, Metcalfe, Travis S., Santos, Ângela R. G., Montet, Benjamin T., Isaacson, Howard, Witzke, Veronika, Shapiro, Alexander I., Mathur, Savita, Davies, Guy R., Lund, Mikkel N., Garcia, Rafael A., Brun, Allan S., Salabert, David, Avelino, Pedro P., Saders, Jennifer van, Egeland, Ricky, Cunha, Margarida S., Campante, Tiago L., Chaplin, William J., Krivova, Natalie, Solanki, Sami K., Stritzinger, Maximilian, Knudsen, Mads F.

“…Observations of Sun-like stars over the past half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11 yr solar…”
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Chronologically dating the early assembly of the Milky Way by Montalbán, Josefina, Mackereth, J. Ted, Miglio, Andrea, Vincenzo, Fiorenzo, Chiappini, Cristina, Buldgen, Gael, Mosser, Benoît, Noels, Arlette, Scuflaire, Richard, Vrard, Mathieu, Willett, Emma, Davies, Guy R., Hall, Oliver J., Bo Nielsen, Martin, Khan, Saniya, Rendle, Ben M., van Rossem, Walter E., Ferguson, Jason W., Chaplin, William J.

“…The standard cosmological model predicts that galaxies are built through hierarchical assembly on cosmological timescales 1 , 2 . The Milky Way, like other…”
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Stellar Cruise Control: Weakened Magnetic Braking Leads to Sustained Rapid Rotation of Old Stars by Saunders, Nicholas, van Saders, Jennifer L., Lyttle, Alexander J., Metcalfe, Travis S., Li, Tanda, Davies, Guy R., Hall, Oliver J., Ball, Warrick H., Townsend, Richard, Creevey, Orlagh, Dodds, Curt

“…Abstract Despite a growing sample of precisely measured stellar rotation periods and ages, the strength of magnetic braking and the degree of departure from…”
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Unveiling the distinct formation pathways of the inner and outer discs of the Milky Way with Bayesian Machine Learning by Ciucă, Ioana, Kawata, Daisuke, Miglio, Andrea, Davies, Guy R, Grand, Robert J J

“…ABSTRACT We develop a Bayesian Machine Learning framework called BINGO (Bayesian INference for Galactic archaeOlogy) centred around a Bayesian neural network…”
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Changing the ν max Scaling Relation: The Need for a Mean Molecular Weight Term by Viani, Lucas S., Basu, Sarbani, Chaplin, William J., Davies, Guy R., Elsworth, Yvonne

“…Abstract The scaling relations that relate the average asteroseismic parameters and to the global properties of stars are used quite extensively to determine…”
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Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler by Doyle, Amanda P., Davies, Guy R., Smalley, Barry, Chaplin, William J., Elsworth, Yvonne

“…The Rossiter–McLaughlin effect observed for transiting exoplanets often requires prior knowledge of the stellar projected equatorial rotational velocity (v sin…”
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Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes by Huber, Daniel, Zinn, Joel, Bojsen-Hansen, Mathias, Pinsonneault, Marc, Sahlholdt, Christian, Serenelli, Aldo, Aguirre, Victor Silva, Stassun, Keivan, Stello, Dennis, Tayar, Jamie, Bastien, Fabienne, Bedding, Timothy R., Buchhave, Lars A., Chaplin, William J., Davies, Guy R., García, Rafael A., Latham, David W., Mathur, Savita, Mosser, Benoit, Sharma, Sanjib

“…We present a comparison of parallaxes and radii from asteroseismology and Gaia DR1 (TGAS) for 2200 Kepler stars spanning from the main sequence to the…”
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The TESS light curve of AI Phoenicis by Maxted, P F L, Gaulme, Patrick, Graczyk, D, Hełminiak, K G, Johnston, C, Orosz, Jerome A, Prša, Andrej, Southworth, John, Torres, Guillermo, Davies, Guy R, Ball, Warrick, Chaplin, William J

“…ABSTRACT Accurate masses and radii for normal stars derived from observations of detached eclipsing binary stars are of fundamental importance for testing…”
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Orbital misalignment of the super-Earth π Men c with the spin of its star by Kunovac Hodžić, Vedad, Triaud, Amaury H M J, Cegla, Heather M, Chaplin, William J, Davies, Guy R

“…ABSTRACT Planet–planet scattering events can leave an observable trace of a planet’s migration history in the form of orbital misalignment with respect to the…”
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Testing asteroseismology with Gaia DR2: hierarchical models of the Red Clump by Hall, Oliver J, Davies, Guy R, Elsworth, Yvonne P, Miglio, Andrea, Bedding, Timothy R, Brown, Anthony G A, Khan, Saniya, Hawkins, Keith, García, Rafael A, Chaplin, William J, North, Thomas S H

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Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II. Radii, Masses, and Ages by Aguirre, Víctor Silva, Lund, Mikkel N., Antia, H. M., Ball, Warrick H., Basu, Sarbani, Christensen-Dalsgaard, Jørgen, Lebreton, Yveline, Reese, Daniel R., Verma, Kuldeep, Casagrande, Luca, Justesen, Anders B., Mosumgaard, Jakob R., Chaplin, William J., Bedding, Timothy R., Davies, Guy R., Handberg, Rasmus, Houdek, Günter, Huber, Daniel, Kjeldsen, Hans, Latham, David W., White, Timothy R., Coelho, Hugo R., Miglio, Andrea, Rendle, Ben

“…We use asteroseismic data from the Kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full…”
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Systematics in asteroseismic modelling: application of a correlated noise model for oscillation frequencies by Li, Tanda, Davies, Guy R, Nielsen, Martin, Cunha, Margarida S, Lyttle, Alexander J

“…ABSTRACT The detailed modelling of stellar oscillations is a powerful approach to characterizing stars. However, poor treatment of systematics in theoretical…”
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Asteroseismology of three evolved stars in M67: testing systematic biases in seismic masses and ages by Li (李坦达), Tanda, Bi (毕少兰), Shaolan, Davies, Guy R, Bedding, Timothy R, Li (李亚光), Yaguang, Stello, Dennis, Reyes, Claudia

“…ABSTRACT Asteroseismology can precisely characterize stars, but the accuracy of seismic inference is still an open question. In this work, we use three evolved…”
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The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1–C8 and C10–C18 by Zinn, Joel C., Stello, Dennis, Elsworth, Yvonne, García, Rafael A., Kallinger, Thomas, Mathur, Savita, Mosser, Benoît, Hon, Marc, Bugnet, Lisa, Jones, Caitlin, Reyes, Claudia, Sharma, Sanjib, Schönrich, Ralph, Warfield, Jack T., Luger, Rodrigo, Vanderburg, Andrew, Kobayashi, Chiaki, Pinsonneault, Marc H., Johnson, Jennifer A., Huber, Daniel, Buder, Sven, Joyce, Meridith, Bland-Hawthorn, Joss, Casagrande, Luca, Lewis, Geraint F., Miglio, Andrea, Nordlander, Thomas, Davies, Guy R., Silva, Gayandhi De, Chaplin, William J., Silva Aguirre, Victor

“…Abstract We present the third and final data release of the K2 Galactic Archaeology Program (K2 GAP) for Campaigns C1–C8 and C10–C18. We provide asteroseismic…”
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Asteroseismology of δ Scuti stars: emulating model grids using a neural network by Scutt, Owen J, Murphy, Simon J, Nielsen, Martin B, Davies, Guy R, Bedding, Timothy R, Lyttle, Alexander J

“…ABSTRACT Young δ Scuti (Sct) stars have proven to be valuable asteroseismic targets, but obtaining robust uncertainties on their inferred properties is…”
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