Tabby's Star

Tabby's Star

A seminar given in the ESS 495 course at the University of Washington on the "Most mysterious star in the universe"

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James Davenport

May 08, 2018
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Transcript

  1. “Tabby’s Star” The most mysterious star in the universe James

    R. A. Davenport NSF Astronomy & Astrophysics Postdoctoral Fellow, Western Washington University DIRAC Fellow, University of Washington jradavenport UNIVERSITY OF WASHINGTON
  2. !2 The search for planets around other stars
 aka “Exoplanets”

  3. !3

  4. !4 jradavenport

  5. !5 jradavenport ~120 mph

  6. !6 A “Hot Jupiter” jradavenport

  7. !7 Transiting exoplanets jradavenport

  8. !8 jradavenport Transiting exoplanets

  9. !9 Kepler 4 years, 1 field Study 200,000 stars Stars

    of all ages! jradavenport Transiting exoplanets
  10. !10 jradavenport

  11. !11 First planets announced by Kepler (Jan 2010, DC) jradavenport

  12. !12 An “orrery” jradavenport

  13. !13 jradavenport The Kepler Orrery

  14. Kepler has found some weird & neat things! ? ?

    ? ? ? ? ? ? ? ? ? jradavenport
  15. None
  16. jradavenport !16 “Circumbinary planets” jradavenport

  17. !17 jradavenport “Circumbinary planets”

  18. !18 Phase / Longitude Flux jradavenport Kepler can even measure

    stars rotating Walkowicz+ (2010)
  19. !19 jradavenport “Tabby’s Star” or “Boyajian’s Star”

  20. !20 “Tabby’s Star” or “Boyajian’s Star”

  21. !21 jradavenport Wikipedia Twitter “Tabby’s Star” or “Boyajian’s Star”

  22. !22 jradavenport

  23. !23 jradavenport

  24. !24 jradavenport “Tabby’s Star” or “Boyajian’s Star”

  25. A seemingly normal “F type” star artist conception

  26. A seemingly normal “F type” star Temperature: 6000–76000 deg K

    artist conception
  27. A seemingly normal “F type” star Temperature: 6000–76000 deg K

    artist conception ? Huh?
  28. !28 slow 3% fade! The plot thickens “Tabby’s Star” or

    “Boyajian’s Star”
  29. !29 1-2% variation jradavenport Continued monitoring… still weird “Tabby’s Star”

    or “Boyajian’s Star”
  30. !30 2 Mysterious Behaviors 1.Short timescale: dimming events. Strange shape,

    very “deep”, random times.
 
 
 
 2.Long Timescale: slow fading. Very slow, 
 timescale/depth unknown
  31. !31 So, what is it?!
 
 or What isn’t it?

  32. !32 Phase / Longitude Flux Probably not rotation i.e. not

    the surface of the star
  33. !33 jradavenport comets?

  34. !34 comets? jradavenport

  35. !35 comets? jradavenport but, 20%…? and?

  36. !36 jradavenport a funky disk or ring? Needs to be

    very dynamic, not periodic
  37. !37 jradavenport planet smash?! Needs to be very dynamic, not

    periodic
  38. !38 jradavenport Visible light Infrared Far-Infrared Brightness Normal No sign

    of a dusty disk
  39. !39 jradavenport

  40. !40 Dyson sphere

  41. !41 Dyson sphere

  42. !42 Visible light Infrared Far-Infrared Brightness Dyson sphere No IR

    emission, and no sensible pattern/shape
  43. !43 Well, what DO we know?

  44. !44 Ultraviolet data rules out 
 “normal” interstellar dust Davenport

    et al. (2017)
  45. !45 “Normal” interstellar dust

  46. !46

  47. !47 Long timescale modulations may be repeating…? Simon et al.

    (2018)
  48. !48 Long timescale modulations may be repeating…? Simon et al.

    (2018) Hippke et al. (2018)
  49. !49

  50. !50 Short timescale modulations may be repeating…?!?!

  51. !51 Current “best idea”…

  52. !52 Current “best idea”…

  53. !53 Current “best idea”… The next frontier: where are the

    OTHER “Tabby Stars”?