[{"main_file_link":[{"url":"https://arxiv.org/abs/2012.04051","open_access":"1"}],"quality_controlled":"1","_id":"11610","date_updated":"2022-08-22T07:04:45Z","type":"journal_article","article_processing_charge":"No","doi":"10.3847/1538-4365/abbee3","publisher":"IOP Publishing","date_published":"2020-12-01T00:00:00Z","acknowledgement":"We thank the referee for comments that strengthened the manuscript. J. C. Z. and M. H. P. acknowledge support from NASA grants 80NSSC18K0391 and NNX17AJ40G. Y. E. and C. J. acknowledge the support of the UK Science and Technology Facilities Council (STFC). S. M. would like to acknowledge support from the Spanish Ministry with the Ramon y Cajal fellowship number RYC-2015-17697. R. A. G. acknowledges funding received from the PLATO CNES grant. R. S. acknowledges funding via a Royal Society University Research Fellowship. D.H. acknowledges support from the Alfred P. Sloan Foundation and the National Aeronautics and Space Administration (80NSSC19K0108). V.S.A. acknowledges support from the Independent Research Fund Denmark (Research grant 7027-00096B), and the Carlsberg foundation (grant agreement CF19-0649). This research was supported in part by the National Science Foundation under grant No. NSF PHY-1748958.\r\n\r\nFunding for the Stellar Astrophysics Centre (SAC) is provided by The Danish National Research Foundation (grant agreement No. DNRF106).\r\n\r\nThe K2 Galactic Archaeology Program is supported by the National Aeronautics and Space Administration under grant NNX16AJ17G issued through the K2 Guest Observer Program.\r\n\r\nThis publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.\r\n\r\nThis work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.\r\n\r\nFunding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High Performance Computing at the University of Utah. The SDSS website is www.sdss.org.\r\n\r\nSDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration, including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, the Harvard–Smithsonian Center for Astrophysics, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University.\r\n\r\nSoftware: asfgrid (Sharma & Stello 2016), emcee (Foreman-Mackey et al. 2013), NumPy (Walt 2011), pandas (McKinney 2010; Reback et al. 2020), Matplotlib (Hunter 2007), IPython (Pérez & Granger 2007), SciPy (Virtanen et al. 2020).","status":"public","extern":"1","publication":"The Astrophysical Journal Supplement Series","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"year":"2020","external_id":{"arxiv":["2012.04051"]},"publication_identifier":{"eissn":["1538-4365"],"issn":["0067-0049"]},"publication_status":"published","abstract":[{"lang":"eng","text":"Studies of Galactic structure and evolution have benefited enormously from Gaia kinematic information, though additional, intrinsic stellar parameters like age are required to best constrain Galactic models. Asteroseismology is the most precise method of providing such information for field star populations en masse, but existing samples for the most part have been limited to a few narrow fields of view by the CoRoT and Kepler missions. In an effort to provide well-characterized stellar parameters across a wide range in Galactic position, we present the second data release of red giant asteroseismic parameters for the K2 Galactic Archaeology Program (GAP). We provide ${\\nu }_{\\max }$ and ${\\rm{\\Delta }}\\nu $ based on six independent pipeline analyses; first-ascent red giant branch (RGB) and red clump (RC) evolutionary state classifications from machine learning; and ready-to-use radius and mass coefficients, κR and κM, which, when appropriately multiplied by a solar-scaled effective temperature factor, yield physical stellar radii and masses. In total, we report 4395 radius and mass coefficients, with typical uncertainties of 3.3% (stat.) ± 1% (syst.) for κR and 7.7% (stat.) ± 2% (syst.) for κM among RGB stars, and 5.0% (stat.) ± 1% (syst.) for κR and 10.5% (stat.) ± 2% (syst.) for κM among RC stars. We verify that the sample is nearly complete—except for a dearth of stars with ${\\nu }_{\\max }\\lesssim 10\\mbox{--}20\\,\\mu \\mathrm{Hz}$—by comparing to Galactic models and visual inspection. Our asteroseismic radii agree with radii derived from Gaia Data Release 2 parallaxes to within 2.2% ± 0.3% for RGB stars and 2.0% ± 0.6% for RC stars."}],"intvolume":"       251","volume":251,"date_created":"2022-07-18T13:27:26Z","article_type":"original","scopus_import":"1","day":"01","author":[{"first_name":"Joel C.","full_name":"Zinn, Joel C.","last_name":"Zinn"},{"full_name":"Stello, Dennis","last_name":"Stello","first_name":"Dennis"},{"last_name":"Elsworth","full_name":"Elsworth, Yvonne","first_name":"Yvonne"},{"full_name":"García, Rafael A.","last_name":"García","first_name":"Rafael A."},{"last_name":"Kallinger","full_name":"Kallinger, Thomas","first_name":"Thomas"},{"first_name":"Savita","full_name":"Mathur, Savita","last_name":"Mathur"},{"last_name":"Mosser","full_name":"Mosser, Benoît","first_name":"Benoît"},{"last_name":"Bugnet","full_name":"Bugnet, Lisa Annabelle","id":"d9edb345-f866-11ec-9b37-d119b5234501","first_name":"Lisa Annabelle","orcid":"0000-0003-0142-4000"},{"first_name":"Caitlin","last_name":"Jones","full_name":"Jones, Caitlin"},{"full_name":"Hon, Marc","last_name":"Hon","first_name":"Marc"},{"last_name":"Sharma","full_name":"Sharma, Sanjib","first_name":"Sanjib"},{"last_name":"Schönrich","full_name":"Schönrich, Ralph","first_name":"Ralph"},{"last_name":"Warfield","full_name":"Warfield, Jack T.","first_name":"Jack T."},{"last_name":"Luger","full_name":"Luger, Rodrigo","first_name":"Rodrigo"},{"last_name":"Pinsonneault","full_name":"Pinsonneault, Marc H.","first_name":"Marc H."},{"first_name":"Jennifer A.","full_name":"Johnson, Jennifer A.","last_name":"Johnson"},{"first_name":"Daniel","full_name":"Huber, Daniel","last_name":"Huber"},{"last_name":"Aguirre","full_name":"Aguirre, Victor Silva","first_name":"Victor Silva"},{"first_name":"William J.","full_name":"Chaplin, William J.","last_name":"Chaplin"},{"first_name":"Guy R.","last_name":"Davies","full_name":"Davies, Guy R."},{"full_name":"Miglio, Andrea","last_name":"Miglio","first_name":"Andrea"}],"title":"The K2 galactic archaeology program data release 2: Asteroseismic results from campaigns 4, 6, and 7","oa_version":"Preprint","citation":{"ama":"Zinn JC, Stello D, Elsworth Y, et al. The K2 galactic archaeology program data release 2: Asteroseismic results from campaigns 4, 6, and 7. <i>The Astrophysical Journal Supplement Series</i>. 2020;251(2). doi:<a href=\"https://doi.org/10.3847/1538-4365/abbee3\">10.3847/1538-4365/abbee3</a>","ieee":"J. C. Zinn <i>et al.</i>, “The K2 galactic archaeology program data release 2: Asteroseismic results from campaigns 4, 6, and 7,” <i>The Astrophysical Journal Supplement Series</i>, vol. 251, no. 2. IOP Publishing, 2020.","short":"J.C. Zinn, D. Stello, Y. Elsworth, R.A. García, T. Kallinger, S. Mathur, B. Mosser, L.A. Bugnet, C. Jones, M. Hon, S. Sharma, R. Schönrich, J.T. Warfield, R. Luger, M.H. Pinsonneault, J.A. Johnson, D. Huber, V.S. Aguirre, W.J. Chaplin, G.R. Davies, A. Miglio, The Astrophysical Journal Supplement Series 251 (2020).","chicago":"Zinn, Joel C., Dennis Stello, Yvonne Elsworth, Rafael A. García, Thomas Kallinger, Savita Mathur, Benoît Mosser, et al. “The K2 Galactic Archaeology Program Data Release 2: Asteroseismic Results from Campaigns 4, 6, and 7.” <i>The Astrophysical Journal Supplement Series</i>. IOP Publishing, 2020. <a href=\"https://doi.org/10.3847/1538-4365/abbee3\">https://doi.org/10.3847/1538-4365/abbee3</a>.","ista":"Zinn JC, Stello D, Elsworth Y, García RA, Kallinger T, Mathur S, Mosser B, Bugnet LA, Jones C, Hon M, Sharma S, Schönrich R, Warfield JT, Luger R, Pinsonneault MH, Johnson JA, Huber D, Aguirre VS, Chaplin WJ, Davies GR, Miglio A. 2020. The K2 galactic archaeology program data release 2: Asteroseismic results from campaigns 4, 6, and 7. The Astrophysical Journal Supplement Series. 251(2), 23.","apa":"Zinn, J. C., Stello, D., Elsworth, Y., García, R. A., Kallinger, T., Mathur, S., … Miglio, A. (2020). The K2 galactic archaeology program data release 2: Asteroseismic results from campaigns 4, 6, and 7. <i>The Astrophysical Journal Supplement Series</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4365/abbee3\">https://doi.org/10.3847/1538-4365/abbee3</a>","mla":"Zinn, Joel C., et al. “The K2 Galactic Archaeology Program Data Release 2: Asteroseismic Results from Campaigns 4, 6, and 7.” <i>The Astrophysical Journal Supplement Series</i>, vol. 251, no. 2, 23, IOP Publishing, 2020, doi:<a href=\"https://doi.org/10.3847/1538-4365/abbee3\">10.3847/1538-4365/abbee3</a>."},"issue":"2","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"language":[{"iso":"eng"}],"article_number":"23","month":"12","arxiv":1},{"type":"journal_article","_id":"11623","date_updated":"2022-08-22T08:10:38Z","publisher":"IOP Publishing","article_processing_charge":"No","doi":"10.3847/1538-4365/ab3b56","quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1908.05222"}],"keyword":["Space and Planetary Science","Astronomy and Astrophysics","methods: data analysis","stars: activity","stars: low-mass","stars: rotation","starspots","techniques: photometric"],"external_id":{"arxiv":["1908.05222"]},"year":"2019","date_published":"2019-09-19T00:00:00Z","acknowledgement":"The authors thank Róbert Szabó Paul G. Beck, Katrien Kolenberg, and Isabel L. Colman for helping on the classification of stars. This paper includes data collected by the Kepler mission and obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the Kepler mission is provided by the National Aeronautics and Space Administration (NASA) Science Mission Directorate. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5–26555. A.R.G.S. acknowledges the support from NASA under grant NNX17AF27G. R.A.G. and L.B. acknowledge the support from PLATO and GOLF CNES grants. S.M. acknowledges the support from the Ramon y Cajal fellowship number RYC-2015-17697. T.S.M. acknowledges support from a Visiting Fellowship at the Max Planck Institute for Solar System Research. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program.\r\n\r\nSoftware: KADACS (García et al. 2011), NumPy (van der Walt et al. 2011), SciPy (Jones et al. 2001), Matplotlib (Hunter 2007).\r\n\r\nFacilities: MAST - , Kepler Eclipsing Binary Catalog - , Exoplanet Archive. -","status":"public","publication":"The Astrophysical Journal Supplement Series","extern":"1","date_created":"2022-07-19T09:21:58Z","article_type":"original","volume":244,"title":"Surface rotation and photometric activity for Kepler targets. I. M and K main-sequence stars","oa_version":"Preprint","scopus_import":"1","day":"19","author":[{"last_name":"Santos","full_name":"Santos, A. R. G.","first_name":"A. R. G."},{"first_name":"R. A.","last_name":"García","full_name":"García, R. A."},{"last_name":"Mathur","full_name":"Mathur, S.","first_name":"S."},{"first_name":"Lisa Annabelle","orcid":"0000-0003-0142-4000","last_name":"Bugnet","id":"d9edb345-f866-11ec-9b37-d119b5234501","full_name":"Bugnet, Lisa Annabelle"},{"first_name":"J. L.","last_name":"van Saders","full_name":"van Saders, J. L."},{"first_name":"T. S.","last_name":"Metcalfe","full_name":"Metcalfe, T. S."},{"last_name":"Simonian","full_name":"Simonian, G. V. A.","first_name":"G. V. A."},{"first_name":"M. H.","last_name":"Pinsonneault","full_name":"Pinsonneault, M. H."}],"publication_status":"published","publication_identifier":{"issn":["0067-0049"]},"intvolume":"       244","abstract":[{"text":"Brightness variations due to dark spots on the stellar surface encode information about stellar surface rotation and magnetic activity. In this work, we analyze the Kepler long-cadence data of 26,521 main-sequence stars of spectral types M and K in order to measure their surface rotation and photometric activity level. Rotation-period estimates are obtained by the combination of a wavelet analysis and autocorrelation function of the light curves. Reliable rotation estimates are determined by comparing the results from the different rotation diagnostics and four data sets. We also measure the photometric activity proxy Sph using the amplitude of the flux variations on an appropriate timescale. We report rotation periods and photometric activity proxies for about 60% of the sample, including 4431 targets for which McQuillan et al. did not report a rotation period. For the common targets with rotation estimates in this study and in McQuillan et al., our rotation periods agree within 99%. In this work, we also identify potential polluters, such as misclassified red giants and classical pulsator candidates. Within the parameter range we study, there is a mild tendency for hotter stars to have shorter rotation periods. The photometric activity proxy spans a wider range of values with increasing effective temperature. The rotation period and photometric activity proxy are also related, with Sph being larger for fast rotators. Similar to McQuillan et al., we find a bimodal distribution of rotation periods.","lang":"eng"}],"article_number":"21","arxiv":1,"month":"09","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ieee":"A. R. G. Santos <i>et al.</i>, “Surface rotation and photometric activity for Kepler targets. I. M and K main-sequence stars,” <i>The Astrophysical Journal Supplement Series</i>, vol. 244, no. 1. IOP Publishing, 2019.","short":"A.R.G. Santos, R.A. García, S. Mathur, L.A. Bugnet, J.L. van Saders, T.S. Metcalfe, G.V.A. Simonian, M.H. Pinsonneault, The Astrophysical Journal Supplement Series 244 (2019).","ama":"Santos ARG, García RA, Mathur S, et al. Surface rotation and photometric activity for Kepler targets. I. M and K main-sequence stars. <i>The Astrophysical Journal Supplement Series</i>. 2019;244(1). doi:<a href=\"https://doi.org/10.3847/1538-4365/ab3b56\">10.3847/1538-4365/ab3b56</a>","apa":"Santos, A. R. G., García, R. A., Mathur, S., Bugnet, L. A., van Saders, J. L., Metcalfe, T. S., … Pinsonneault, M. H. (2019). Surface rotation and photometric activity for Kepler targets. I. M and K main-sequence stars. <i>The Astrophysical Journal Supplement Series</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4365/ab3b56\">https://doi.org/10.3847/1538-4365/ab3b56</a>","mla":"Santos, A. R. G., et al. “Surface Rotation and Photometric Activity for Kepler Targets. I. M and K Main-Sequence Stars.” <i>The Astrophysical Journal Supplement Series</i>, vol. 244, no. 1, 21, IOP Publishing, 2019, doi:<a href=\"https://doi.org/10.3847/1538-4365/ab3b56\">10.3847/1538-4365/ab3b56</a>.","chicago":"Santos, A. R. G., R. A. García, S. Mathur, Lisa Annabelle Bugnet, J. L. van Saders, T. S. Metcalfe, G. V. A. Simonian, and M. H. Pinsonneault. “Surface Rotation and Photometric Activity for Kepler Targets. I. M and K Main-Sequence Stars.” <i>The Astrophysical Journal Supplement Series</i>. IOP Publishing, 2019. <a href=\"https://doi.org/10.3847/1538-4365/ab3b56\">https://doi.org/10.3847/1538-4365/ab3b56</a>.","ista":"Santos ARG, García RA, Mathur S, Bugnet LA, van Saders JL, Metcalfe TS, Simonian GVA, Pinsonneault MH. 2019. Surface rotation and photometric activity for Kepler targets. I. M and K main-sequence stars. The Astrophysical Journal Supplement Series. 244(1), 21."},"issue":"1","language":[{"iso":"eng"}],"oa":1}]