SOLAR-LIKE OSCILLATIONS IN LOW-LUMINOSITY RED GIANTS: FIRST RESULTS FROM KEPLER

By T. Bedding, D. Huber, D. Stello, Y. Elsworth, S. Hekker, T. Kallinger, S. Mathur, B. Mosser, H. Preston, J. Ballot and 40 more. 2010

191 citations recorded by the source corpus.

We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30 minute sampling, reveal clear oscillations in a large sample of G and K giants, extending in luminosity from the red clump down to the bottom of the giant branch. We confirm a strong correlation between the large separation of the oscillations (Δν) and the frequency of maximum power (νmax). We focus on a sample of 50 low-luminosity stars (νmax > 100 μHz, L ≲ 30 L☉) having high signal-to-noise ratios and showing the unambiguous signature of solar-like oscillations. These are H-shell-burning stars, whose oscillations should be valuable for testing models of stellar evolution and for constraining the star formation rate in the local disk. We use a new technique to compare stars on a single échelle diagram by scaling their frequencies and find well-defined ridges corresponding to radial and non-radial oscillations, including clear evidence for modes with angular degree l = 3. Measuring the small separation between l = 0 and l = 2 allows us to plot the so-called C-D diagram of δν02 versus Δν. The small separation δν01 of l = 1 from the midpoint of adjacent l = 0 modes is negative, contrary to the Sun and solar-type stars. The ridge for l = 1 is notably broadened, which we attribute to mixed modes, confirming theoretical predictions for low-luminosity giants. Overall, the results demonstrate the tremendous potential of Kepler data for asteroseismology of red giants.

Subfields: Astronomy and Astrophysics, Education, Instrumentation

View Paper: https://www.semanticscholar.org/paper/ed0a27dbc1fc0d6b35912aa3bea884cda8905d9a

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. D. Huber
2. D. Stello
3. W. Chaplin
4. D. Charbonneau
5. E. Gaidos
6. Jo Bovy
7. A. Miglio
8. T. Bedding

In Education

1. A. Serenelli
2. C. Chiappini
3. D. Huber
4. C. Allende Prieto
5. J. Holtzman
6. M. Shetrone
7. Jo Bovy
8. D. Nidever

In Instrumentation

1. D. Huber
2. D. Stello
3. W. Chaplin
4. B. Mosser
5. D. Charbonneau
6. T. Bedding
7. E. Gaidos
8. A. Miglio

Citations in the corpus

• Spin down of the core rotation in red giants (2012, background): “They were first reported by Bedding et al. (2010).”
• REVISED STELLAR PROPERTIES OF KEPLER TARGETS FOR THE QUARTER 1–16 TRANSIT DETECTION RUN (2013, background): “…et al. 2011), to classical pulsators (Grigahcène et al. 2010; Kolenberg et al. 2010; Kurtz et al. 2011), cool dwarfs (Chaplin et al. 2011; Silva Aguirre et al. 2011; Mathur et al. 2012) and red giant stars (Bedding et al. 2010; Hekker et al. 2011; Kallinger et al. 2010; Mosser et al. 2012a).”
• Probing the core structure and evolution of red giants using gravity-dominated mixed modes observed with Kepler (2012, methodology): “…work25 (e.g. Dziembowski et al. 2001; Christensen-Dalsgaard 2004; Dupret et al. 2009, and references therein), were reported in red giants by Bedding et al. (2010), who attributed the broadening of the ℓ = 1 ridge to the presence of multiple ℓ = 1 peaks whose frequencies are shifted by…”
• THE APOKASC CATALOG: AN ASTEROSEISMIC AND SPECTROSCOPIC JOINT SURVEY OF TARGETS IN THE KEPLER FIELDS (2014, background): “In an important breakthrough, the CoRoT (De Ridder et al. 2009) and Kepler (Bedding et al. 2010) missions have discovered that virtually all red giants are non-radial oscillators.”
• PHOTOMETRIC VARIABILITY IN KEPLER TARGET STARS. II. AN OVERVIEW OF AMPLITUDE, PERIODICITY, AND ROTATION IN FIRST QUARTER DATA (2010, background): “As described by (Bedding et al. 2010) they tend to have complex variability; periodograms do not reach the level of Pstr we have set as our minimum threshold for significant periodicity (and exhibit multiple period peaks of comparable strength).”
• Asteroseismology of Solar-Type and Red-Giant Stars (2013, background): “The long-cadence Kepler data have yielded asteroseismic data of unprecented quality on stars in the red-giant phase (e.g., see Bedding et al. 2010, Huber et al. 2010, Kallinger et al. 2010, Hekker et al. 2011b), including giants in the open clusters NGC6791, NGC6819 and NGC6811 (Stello et al.…”
• Red-giant seismic properties analyzed with CoRoT (2010, methodology): “The EACF method and its automated pipeline have been tested on the CoRoT red giants presented by De Ridder et al. (2009) and Hekker et al. (2009), and also on the Kepler red giants (Stello et al., 2010; Bedding et al., 2010).”
• Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars (2012, background): “That situation has now changed thanks to asteroseismology, with the detection of solar-like pulsations in thousands of red giants (De Ridder et al. 2009; Bedding et al. 2010; Hekker et al. 2011) observed by the CoRoT (Baglin & Fridlund 2006) and Kepler (Gilliland et al. 2010) space telescopes.”
• ASTEROSEISMOLOGY OF RED GIANTS FROM THE FIRST FOUR MONTHS OF KEPLER DATA: GLOBAL OSCILLATION PARAMETERS FOR 800 STARS (2010, methodology): “First results for red giants were based on 34 d of data (Bedding et al. 2010b; see also Stello et al. 2010; Hekker et al. 2010b) which demonstrated the enormous potential of Kepler data.”
• Asteroseismology of red giants from the first four months of Kepler data: Fundamental stellar parameters (2010, background): “Most recently, the NASAKepler Mission has demonstrated its great asteroseismic potential to observe solar-type oscillations in red giants (Bedding et al. 2010; Hekker et al. 2010b; Stello et al. 2010).”
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity (2014, background): “…not a concern since they have much shorter timescales, confirmed recently for red giants in large numbers via asteroseismology performed with Kepler data, such as in Bedding et al. (2010), Kallinger et al. (2012), or Stello et al. (2013); they manifest themselves as stellar jitter in our RV curves.”
• The universal red-giant oscillation pattern; an automated determination with CoRoT data (2010, methodology): “The new era of the spaceborne missions CoRoT andKepler has dramatically increased the amount and quality of the available asteroseismic data of red giants (Hekker et al. 2009; Bedding et al. 2010a; Mosser et al. 2010; Huber et al. 2010).”
• ASTEROSEISMIC CLASSIFICATION OF STELLAR POPULATIONS AMONG 13,000 RED GIANTS OBSERVED BY KEPLER (2013, background): “In addition to the regular, and largely scalable, frequency pattern of the p modes, red giants show a more complex pattern arising from large numbers of mixed modes, most pronounced for dipole,l = 1, modes (Bedding et al. 2010).”
• FUNDAMENTAL PROPERTIES OF KEPLER PLANET-CANDIDATE HOST STARS USING ASTEROSEISMOLOGY (2013, unknown): “In addition, oscillation timescales scale with stellar luminosity, with frequencies for red giants falling well below the long-cadence Nyquist limit (see, e.g., Bedding et al. 2010; Hekker et al. 2011b; Mosser et al. 2012).”
• Red giant masses and ages derived from carbon and nitrogen abundances (2015, unknown): “…et al. 2010), and now K2 space missions, solar-like oscillations have been detected in thousands of red giants (e.g. De Ridder et al. 2009; Hekker et al. 2009, 2011; Bedding et al. 2010; Mosser et al. 2010; Stello et al. 2013, 2015), for stars up to 8 kpc from the Sun (Miglio et al. 2013a).”