---
_id: '11610'
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.
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)."
article_number: '23'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Joel C.
full_name: Zinn, Joel C.
last_name: Zinn
- first_name: Dennis
full_name: Stello, Dennis
last_name: Stello
- first_name: Yvonne
full_name: Elsworth, Yvonne
last_name: Elsworth
- first_name: Rafael A.
full_name: García, Rafael A.
last_name: García
- first_name: Thomas
full_name: Kallinger, Thomas
last_name: Kallinger
- first_name: Savita
full_name: Mathur, Savita
last_name: Mathur
- first_name: Benoît
full_name: Mosser, Benoît
last_name: Mosser
- first_name: Lisa Annabelle
full_name: Bugnet, Lisa Annabelle
id: d9edb345-f866-11ec-9b37-d119b5234501
last_name: Bugnet
orcid: 0000-0003-0142-4000
- first_name: Caitlin
full_name: Jones, Caitlin
last_name: Jones
- first_name: Marc
full_name: Hon, Marc
last_name: Hon
- first_name: Sanjib
full_name: Sharma, Sanjib
last_name: Sharma
- first_name: Ralph
full_name: Schönrich, Ralph
last_name: Schönrich
- first_name: Jack T.
full_name: Warfield, Jack T.
last_name: Warfield
- first_name: Rodrigo
full_name: Luger, Rodrigo
last_name: Luger
- first_name: Marc H.
full_name: Pinsonneault, Marc H.
last_name: Pinsonneault
- first_name: Jennifer A.
full_name: Johnson, Jennifer A.
last_name: Johnson
- first_name: Daniel
full_name: Huber, Daniel
last_name: Huber
- first_name: Victor Silva
full_name: Aguirre, Victor Silva
last_name: Aguirre
- first_name: William J.
full_name: Chaplin, William J.
last_name: Chaplin
- first_name: Guy R.
full_name: Davies, Guy R.
last_name: Davies
- first_name: Andrea
full_name: Miglio, Andrea
last_name: Miglio
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. The Astrophysical
Journal Supplement Series. 2020;251(2). doi:10.3847/1538-4365/abbee3'
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. The Astrophysical Journal Supplement Series.
IOP Publishing. https://doi.org/10.3847/1538-4365/abbee3'
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.” The Astrophysical
Journal Supplement Series. IOP Publishing, 2020. https://doi.org/10.3847/1538-4365/abbee3.'
ieee: 'J. C. Zinn et al., “The K2 galactic archaeology program data release
2: Asteroseismic results from campaigns 4, 6, and 7,” The Astrophysical Journal
Supplement Series, vol. 251, no. 2. IOP Publishing, 2020.'
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.'
mla: 'Zinn, Joel C., et al. “The K2 Galactic Archaeology Program Data Release 2:
Asteroseismic Results from Campaigns 4, 6, and 7.” The Astrophysical Journal
Supplement Series, vol. 251, no. 2, 23, IOP Publishing, 2020, doi:10.3847/1538-4365/abbee3.'
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).
date_created: 2022-07-18T13:27:26Z
date_published: 2020-12-01T00:00:00Z
date_updated: 2022-08-22T07:04:45Z
day: '01'
doi: 10.3847/1538-4365/abbee3
extern: '1'
external_id:
arxiv:
- '2012.04051'
intvolume: ' 251'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2012.04051
month: '12'
oa: 1
oa_version: Preprint
publication: The Astrophysical Journal Supplement Series
publication_identifier:
eissn:
- 1538-4365
issn:
- 0067-0049
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The K2 galactic archaeology program data release 2: Asteroseismic results
from campaigns 4, 6, and 7'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 251
year: '2020'
...