TY - JOUR
T1 - A DISTANT MIRROR
T2 - SOLAR OSCILLATIONS OBSERVED on NEPTUNE by the KEPLER K 2 MISSION
AU - Gaulme, P.
AU - Rowe, J. F.
AU - Bedding, T. R.
AU - Benomar, O.
AU - Corsaro, E.
AU - Davies, G. R.
AU - Hale, S. J.
AU - Howe, R.
AU - Garcia, R. A.
AU - Huber, D.
AU - Jiménez, A.
AU - Mathur, S.
AU - Mosser, B.
AU - Appourchaux, T.
AU - Boumier, P.
AU - Jackiewicz, J.
AU - Leibacher, J.
AU - Schmider, F. X.
AU - Hammel, H. B.
AU - Lissauer, J. J.
AU - Marley, M. S.
AU - Simon, A. A.
AU - Chaplin, W. J.
AU - Elsworth, Y.
AU - Guzik, J. A.
AU - Murphy, N.
AU - Aguirre, V. Silva
N1 - Funding Information:
D.H. acknowledges support by the Australian Research Councils Discovery Projects funding scheme (project number DE140101364) and support by the National Aeronautics and Space Administration under grant NNX14AB92G issued through the Kepler Participating Scientist Program. S.M. would like to acknowledge support from NASA grants NNX12AE17G and NNX15AF13G and NSF grant AST-1411685.
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved..
PY - 2016/12/10
Y1 - 2016/12/10
N2 - Starting in 2014 December, Kepler K 2 observed Neptune continuously for 49 days at a 1 minute cadence. The goals consisted of studying its atmospheric dynamics, detecting its global acoustic oscillations, and those of the Sun, which we report on here. We present the first indirect detection of solar oscillations in intensity measurements. Beyond the remarkable technical performance, it indicates how Kepler would see a star like the Sun. The result from the global asteroseismic approach, which consists of measuring the oscillation frequency at maximum amplitude ν max and the mean frequency separation between mode overtones Δν, is surprising as the ν max measured from Neptune photometry is larger than the accepted value. Compared to the usual reference ν max,o = 3100 μHz, the asteroseismic scaling relations therefore make the solar mass and radius appear larger by 13.8 ±5.8% and 4.3 ±1.9%, respectively. The higher ν max is caused by a combination of the value of ν max,o, being larger at the time of observations than the usual reference from SOHO/VIRGO/SPM data (3160 ±10 μHz), and the noise level of the K 2 time series, being 10 times larger than VIRGO's. The peak-bagging method provides more consistent results: despite a low signal-to-noise ratio (S/N), we model 10 overtones for degrees ℓ = 0, 1, 2. We compare the K 2 data with simultaneous SOHO/VIRGO/SPM photometry and BiSON velocity measurements. The individual frequencies, widths, and amplitudes mostly match those from VIRGO and BiSON within 1σ, except for the few peaks with the lowest S/N.
AB - Starting in 2014 December, Kepler K 2 observed Neptune continuously for 49 days at a 1 minute cadence. The goals consisted of studying its atmospheric dynamics, detecting its global acoustic oscillations, and those of the Sun, which we report on here. We present the first indirect detection of solar oscillations in intensity measurements. Beyond the remarkable technical performance, it indicates how Kepler would see a star like the Sun. The result from the global asteroseismic approach, which consists of measuring the oscillation frequency at maximum amplitude ν max and the mean frequency separation between mode overtones Δν, is surprising as the ν max measured from Neptune photometry is larger than the accepted value. Compared to the usual reference ν max,o = 3100 μHz, the asteroseismic scaling relations therefore make the solar mass and radius appear larger by 13.8 ±5.8% and 4.3 ±1.9%, respectively. The higher ν max is caused by a combination of the value of ν max,o, being larger at the time of observations than the usual reference from SOHO/VIRGO/SPM data (3160 ±10 μHz), and the noise level of the K 2 time series, being 10 times larger than VIRGO's. The peak-bagging method provides more consistent results: despite a low signal-to-noise ratio (S/N), we model 10 overtones for degrees ℓ = 0, 1, 2. We compare the K 2 data with simultaneous SOHO/VIRGO/SPM photometry and BiSON velocity measurements. The individual frequencies, widths, and amplitudes mostly match those from VIRGO and BiSON within 1σ, except for the few peaks with the lowest S/N.
KW - Sun: helioseismology
KW - planets and satellites: individual (Neptune)
KW - stars: oscillations (including pulsations)
KW - techniques: photometric
UR - http://www.scopus.com/inward/record.url?scp=85007018177&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85007018177&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/833/1/L13
DO - 10.3847/2041-8213/833/1/L13
M3 - Article
AN - SCOPUS:85007018177
SN - 2041-8205
VL - 833
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L13
ER -