Ball, Warrick Heinz

[["dc.bibliographiccitation.artnumber","31"],["dc.bibliographiccitation.firstpage","31"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.volume","830"],["dc.contributor.author","Bellinger, Earl P."],["dc.contributor.author","Angelou, George C."],["dc.contributor.author","Hekker, Saskia"],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Ball, Warrick H."],["dc.contributor.author","Guggenberger, Elisabeth"],["dc.date.accessioned","2020-12-10T18:47:32Z"],["dc.date.available","2020-12-10T18:47:32Z"],["dc.date.issued","2016"],["dc.description.abstract","Owing to the remarkable photometric precision of space observatories like Kepler, stellar and planetary systems beyond our own are now being characterized en masse for the first time. These characterizations are pivotal for endeavors such as searching for Earth-like planets and solar twins, understanding the mechanisms that govern stellar evolution, and tracing the dynamics of our Galaxy. The volume of data that is becoming available, however, brings with it the need to process this information accurately and rapidly. While existing methods can constrain fundamental stellar parameters such as ages, masses, and radii from these observations, they require substantial computational effort to do so. We develop a method based on machine learning for rapidly estimating fundamental parameters of main-sequence solar-like stars from classical and asteroseismic observations. We first demonstrate this method on a hare-and-hound exercise and then apply it to the Sun, 16 Cyg A and B, and 34 planet-hosting candidates that have been observed by the Kepler spacecraft. We find that our estimates and their associated uncertainties are comparable to the results of other methods, but with the additional benefit of being able to explore many more stellar parameters while using much less computation time. We furthermore use this method to present evidence for an empirical diffusion-mass relation. Our method is open source and freely available for the community to use."],["dc.identifier.doi","10.3847/0004-637X/830/1/31"],["dc.identifier.eissn","1538-4357"],["dc.identifier.isi","000400461900001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78796"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1538-4357"],["dc.relation.issn","0004-637X"],["dc.title","Fundamental Parameters of Main-Sequence Stars in an Instant with Machine Learning"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","05003"],["dc.bibliographiccitation.journal","EPJ Web of Conferences"],["dc.bibliographiccitation.volume","160"],["dc.contributor.author","Bellinger, Earl P."],["dc.contributor.author","Angelou, George C."],["dc.contributor.author","Hekker, Saskia"],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Ball, Warrick H."],["dc.contributor.author","Guggenberger, Elisabet"],["dc.contributor.editor","Monteiro, M.J.P.F.G."],["dc.contributor.editor","Cunha, M.S."],["dc.contributor.editor","Ferreira, J.M.T.S."],["dc.date.accessioned","2020-12-10T18:11:58Z"],["dc.date.available","2020-12-10T18:11:58Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1051/epjconf/201716005003"],["dc.identifier.eissn","2100-014X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74199"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Stellar Parameters in an Instant with Machine Learning"],["dc.title.alternative","Application to\n Kepler\n LEGACY Targets"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","23"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Astrophysical Journal Supplement Series"],["dc.bibliographiccitation.volume","233"],["dc.contributor.author","Serenelli, Aldo"],["dc.contributor.author","Johnson, Jennifer"],["dc.contributor.author","Huber, Daniel"],["dc.contributor.author","Pinsonneault, Marc"],["dc.contributor.author","Ball, Warrick H."],["dc.contributor.author","Tayar, Jamie"],["dc.contributor.author","Aguirre, Victor Silva"],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Troup, Nicholas"],["dc.contributor.author","Hekker, Saskia"],["dc.contributor.author","Kallinger, Thomas"],["dc.contributor.author","Stello, Dennis"],["dc.contributor.author","Davies, Guy R."],["dc.contributor.author","Lund, Mikkel N."],["dc.contributor.author","Mathur, Savita"],["dc.contributor.author","Mosser, Benoit"],["dc.contributor.author","Stassun, Keivan G."],["dc.contributor.author","Chaplin, William J."],["dc.contributor.author","Elsworth, Yvonne"],["dc.contributor.author","García, Rafael A."],["dc.contributor.author","Handberg, Rasmus"],["dc.contributor.author","Holtzman, Jon"],["dc.contributor.author","Hearty, Fred"],["dc.contributor.author","García-Hernández, D. A."],["dc.contributor.author","Gaulme, Patrick"],["dc.contributor.author","Zamora, Olga"],["dc.date.accessioned","2020-12-10T18:47:36Z"],["dc.date.available","2020-12-10T18:47:36Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.3847/1538-4365/aa97df"],["dc.identifier.eissn","1538-4365"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78821"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","The First APOKASC Catalog of Kepler Dwarf and Subgiant Stars"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","173"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.volume","835"],["dc.contributor.author","Aguirre, Victor Silva"],["dc.contributor.author","Lund, Mikkel N."],["dc.contributor.author","Antia, H. M."],["dc.contributor.author","Ball, Warrick H."],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Christensen-Dalsgaard, Jorgen"],["dc.contributor.author","Lebreton, Yveline"],["dc.contributor.author","Reese, Daniel R."],["dc.contributor.author","Verma, Kuldeep"],["dc.contributor.author","Casagrande, Luca"],["dc.contributor.author","Justesen, Anders B."],["dc.contributor.author","Mosumgaard, Jakob R."],["dc.contributor.author","Chaplin, William J."],["dc.contributor.author","Bedding, Timothy R."],["dc.contributor.author","Davies, Guy R."],["dc.contributor.author","Handberg, Rasmus"],["dc.contributor.author","Houdek, Gunter"],["dc.contributor.author","Huber, Daniel"],["dc.contributor.author","Kjeldsen, Hans"],["dc.contributor.author","Latham, David W."],["dc.contributor.author","White, Timothy R."],["dc.contributor.author","Coelho, Hugo R."],["dc.contributor.author","Miglio, Andrea"],["dc.contributor.author","Rendle, Ben"],["dc.date.accessioned","2018-11-07T10:27:36Z"],["dc.date.available","2018-11-07T10:27:36Z"],["dc.date.issued","2017"],["dc.description.abstract","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 year by the mission. We distributed tens of individual oscillation frequencies extracted from the time series of each star among seven modeling teams who applied different methods to determine radii, masses, and ages for all stars in the sample. Comparisons among the different results reveal a good level of agreement in all stellar properties, which is remarkable considering the variety of codes, input physics, and analysis methods employed by the different teams. Average uncertainties are of the order of similar to 2% in radius, similar to 4% in mass, and similar to 10% in age, making this the best-characterized sample of main-sequence stars available to date. Our predicted initial abundances and mixing-length parameters are checked against inferences from chemical enrichment laws Delta Y/Delta Zand predictions from 3D atmospheric simulations. We test the accuracy of the determined stellar properties by comparing them to the Sun, angular diameter measurements, Gaia parallaxes, and binary evolution, finding excellent agreement in all cases and further confirming the robustness of asteroseismically determined physical parameters of stars when individual frequencies of oscillation are available. Baptised as the Kepler dwarfs LEGACY sample, these stars are the solar-like oscillators with the best asteroseismic properties available for at least another decade. All data used in this analysis and the resulting stellar parameters are made publicly available for the community."],["dc.identifier.doi","10.3847/1538-4357/835/2/173"],["dc.identifier.isi","000401145500002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43266"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1538-4357"],["dc.relation.issn","0004-637X"],["dc.title","Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II. Radii, Masses, and Ages"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","172"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.volume","835"],["dc.contributor.author","Lund, Mikkel N."],["dc.contributor.author","Aguirre, Victor Silva"],["dc.contributor.author","Davies, Guy R."],["dc.contributor.author","Chaplin, William J."],["dc.contributor.author","Christensen-Dalsgaard, Jorgen"],["dc.contributor.author","Houdek, Gunter"],["dc.contributor.author","White, Timothy R."],["dc.contributor.author","Bedding, Timothy R."],["dc.contributor.author","Ball, Warrick H."],["dc.contributor.author","Huber, Daniel"],["dc.contributor.author","Antia, H. M."],["dc.contributor.author","Lebreton, Yveline"],["dc.contributor.author","Latham, David W."],["dc.contributor.author","Handberg, Rasmus"],["dc.contributor.author","Verma, Kuldeep"],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Casagrande, Luca"],["dc.contributor.author","Justesen, Anders B."],["dc.contributor.author","Kjeldsen, Hans"],["dc.contributor.author","Mosumgaard, Jakob R."],["dc.date.accessioned","2018-11-07T10:27:37Z"],["dc.date.available","2018-11-07T10:27:37Z"],["dc.date.issued","2017"],["dc.description.abstract","The advent of space-based missions like Kepler has revolutionized the study of solar-type stars, particularly through the measurement and modeling of their resonant modes of oscillation. Here we analyze a sample of 66 Kepler main-sequence stars showing solar-like oscillations as part of the Kepler seismic LEGACY project. We use Kepler short-cadence data, of which each star has at least 12 months, to create frequency-power spectra optimized for asteroseismology. For each star, we identify its modes of oscillation and extract parameters such as frequency, amplitude, and line width using a Bayesian Markov chain Monte Carlo \"peak-bagging\" approach. We report the extracted mode parameters for all 66 stars, as well as derived quantities such as frequency difference ratios, the large and small separations Delta v and delta v(02); the behavior of line widths with frequency and line widths at v(max) with T-eff, for which we derive parametrizations; and behavior of mode visibilities. These average properties can be applied in future peak-bagging exercises to better constrain the parameters of the stellar oscillation spectra. The frequencies and frequency ratios can tightly constrain the fundamental parameters of these solar-type stars, and mode line widths and amplitudes can test models of mode damping and excitation."],["dc.identifier.doi","10.3847/1538-4357/835/2/172"],["dc.identifier.isi","000401145500001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43267"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.haserratum","/handle/2/78805"],["dc.relation.issn","1538-4357"],["dc.relation.issn","0004-637X"],["dc.title","Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. I. Oscillation Mode Parameters"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","80"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.volume","851"],["dc.contributor.author","Bellinger, Earl P."],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Hekker, Saskia"],["dc.contributor.author","Ball, Warrick H."],["dc.date.accessioned","2020-12-10T18:47:34Z"],["dc.date.available","2020-12-10T18:47:34Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.3847/1538-4357/aa9848"],["dc.identifier.eissn","1538-4357"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78806"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Model-independent Measurement of Internal Stellar Structure in 16 Cygni A and B"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","110"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.volume","850"],["dc.contributor.author","Lund, Mikkel N."],["dc.contributor.author","Silva Aguirre, Víctor"],["dc.contributor.author","Davies, Guy R."],["dc.contributor.author","Chaplin, William J."],["dc.contributor.author","Christensen-Dalsgaard, Jørgen"],["dc.contributor.author","Houdek, Günter"],["dc.contributor.author","White, Timothy R."],["dc.contributor.author","Bedding, Timothy R."],["dc.contributor.author","Ball, Warrick H."],["dc.contributor.author","Huber, Daniel"],["dc.contributor.author","Antia, H. M."],["dc.contributor.author","Lebreton, Yveline"],["dc.contributor.author","Latham, David W."],["dc.contributor.author","Handberg, Rasmus"],["dc.contributor.author","Verma, Kuldeep"],["dc.contributor.author","Basu, Sarbani"],["dc.contributor.author","Casagrande, Luca"],["dc.contributor.author","Justesen, Anders B."],["dc.contributor.author","Kjeldsen, Hans"],["dc.contributor.author","Mosumgaard, Jakob R."],["dc.date.accessioned","2020-12-10T18:47:34Z"],["dc.date.available","2020-12-10T18:47:34Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.3847/1538-4357/aa9658"],["dc.identifier.eissn","1538-4357"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78805"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation.iserratumof","/handle/2/43267"],["dc.title","Erratum: “Standing on the Shoulders of Dwarfs: The Kepler Asteroseismic LEGACY Sample. I. Oscillation Mode Parameters” (2017, ApJ, 835, 172)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","erratum_ja"],["dspace.entity.type","Publication"]]