Seminar - Asteroseismology & Applied Statistics

In this seminar, given at the University of Exeter, I provide an introduction to asteroseismic analysis with modern space-based photometry, and give two examples from my research on how it can be coupled with advanced statistical techniques to provide a diverse range of inferences.

This is a slightly abridged version of the presentation; I have removed a plot showing preliminary unpublished results, and added in two figures that I did not have the space for during the seminar.

Transcript

1. Asteroseismology & Applied Statistics Oliver J. Hall University of Exeter 6 November 2019
2. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
3. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
4. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter 1. Asteroseismology 2. Application 3. What’s next?
5. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Asteroseismology the study of stellar oscillations Credit: asterostep.eu
6. 6 Nov 2019 O. J. Hall Uni & Type CoRoT 2006 - 2013 Kepler 2009 - 2013 K2 2013 - 2019 TESS 2018 - 2020++
7. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
8. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
9. 6 Nov 2019 O. J. Hall Uni & Type
10. 6 Nov 2019 O. J. Hall Acoustic (Pressure) p-modes Buoyant (Gravity) g-modes Credit: Don Kurtz Seminar - U. of Exeter
11. 6 Nov 2019 O. J. Hall Uni & Type
12. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
13. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter 2 0 1 2 0 1
14. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter νmax
15. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter < Δν >
16. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter R R⊙ ≃ ( νmax νmax⊙ ) ( Δν Δν⊙ ) −2 ( Teff Teff⊙ ) 1/2 , M M⊙ ≃ ( νmax νmax⊙ ) 3 ( Δν Δν⊙ ) −4 ( Teff Teff⊙ ) 3/2
17. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter R R⊙ ≃ ( νmax νmax⊙ ) ( Δν Δν⊙ ) −2 ( Teff Teff⊙ ) 1/2 , M M⊙ ≃ ( νmax νmax⊙ ) 3 ( Δν Δν⊙ ) −4 ( Teff Teff⊙ ) 3/2 ,
18. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Asteroseismology Mass, Radius, Surface Gravity (and therefore distances) Frequency Analysis Stellar Rotation & Inclination, interior inversion νmax Δν + + Teff Stellar Models Age, Chemical Mixing, Improved Mass, Radius
19. 6 Nov 2019 O. J. Hall Uni & Type Applications: The Red Clump Asteroseismology can calibrate standard candles
20. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Credit: Gaia Data Release 1, ESA
21. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
22. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Seismic parallax (mas) Apparent K-band mag Figure 2, Davies+17 TGAS parallax (mas) Asteroseismology can identify the Clump!
23. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Question: How can we expand on this?
24. 6 Nov 2019 O. J. Hall Answer: Study population properties! (using fancy hierarchical models) Seminar - U. of Exeter
25. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter μ σ Q σo ̂ Mi σ ̂ Mi Model Population
26. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter == Lets use this! Population Individual stars (5 / 5576)
27. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter μ σ Q σo Mi ̂ Mi σ ̂ Mi Model True Population Individual stars (5 / 5576)
28. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Figure 3, Hall+19
29. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Figure 8, Hall+19
30. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter 30 ~ -70 K Reconciling Gaia & Kepler
31. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Applications: Internal Rotation Asteroseismology can tell us about fundamental stellar physics
32. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Figure 1, Meibom+15
33. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Figure 1, van Saders+16
34. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Figure 2, van Saders+16
35. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Question: How can seismology contribute?
36. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Answer: Measuring internal rotation! Asteroseismology obtains independent age and rotation
37. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
38. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Period
39. 6 Nov 2019 O. J. Hall Uni & Type
40. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
41. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
42. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter
43. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Future Work Model the RC luminosity as depending on multiple parameters, e.g. , , colour [Fe/H] [α/Fe] ~ Chan & Bovy 2019
44. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Source: Oliver’s hopeful grant applications, 2019
45. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter Credit: Ethan Kruse
46. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter CoRoT Kepler K2 TESS PLATO! Data: NASA ADS
47. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter CoRoT Kepler K2 TESS PLATO! Data: NASA ADS
48. 6 Nov 2019 O. J. Hall Seminar - U. of Exeter In summary: Asteroseismology coupled with fancy statistics can provide independent inference, e.g. for: - Calibrating parallaxes & stellar model systematics - Building standard candle relations - Probing stellar rotation - (hopefully) discovering new stellar phsyics!