Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24381
Titolo: | A Distant Mirror: Solar Oscillations Observed on Neptune by the Kepler K2 Mission | Autori: | Gaulme, P. Rowe, J. F. Bedding, T. R. Benomar, O. CORSARO, ENRICO MARIA NICOLA Davies, G. R. Hale, S. J. Howe, R. Garcia, R. A. Huber, D. Jiménez, A. Mathur, S. Mosser, B. Appourchaux, T. Boumier, P. Jackiewicz, J. Leibacher, J. Schmider, F. -X. Hammel, H. B. Lissauer, J. J. Marley, M. S. Simon, A. A. Chaplin, W. J. Elsworth, Y. Guzik, J. A. Murphy, N. Silva Aguirre, V. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 833 | Fascicolo: | 1 | Da pagina:: | L13 | Abstract: | 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 <SUB>max</SUB> and the mean frequency separation between mode overtones ∆ν, is surprising as the ν <SUB>max</SUB> measured from Neptune photometry is larger than the accepted value. Compared to the usual reference ν <SUB>max,☉</SUB> = 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 <SUB>max</SUB> is caused by a combination of the value of ν <SUB>max,☉</SUB>, 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. | URI: | http://hdl.handle.net/20.500.12386/24381 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/833/1/L13 | Bibcode ADS: | 2016ApJ...833L..13G | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
Gaulme_2016_ApJL_833_L13.pdf | pdf editoriale | 793.94 kB | Adobe PDF | Visualizza/apri |
Page view(s)
72
controllato il 19-apr-2024
Download(s)
67
controllato il 19-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.