Monday 13 June, 2022

10h: Registration desk opens. GAIA DR3 release retransmitted “live” in the conference room.

Lunch (sandwiches) served from ~11h30 (hallway just outside the conference room).

13h: Meeting starts ! Welcome and opening remarks (V. Van Grootel) 

SESSION I “Atmospheric studies of hot subdwarfs and related objects”

1. S. Jeffery: “The SALT survey of helium-rich subdwarfs” + general intro on atmospheres (sdB/sdO/H-rich/He-rich etc.) • 13h15-13h45 
2. L. Scott: “The SALT survey of helium-rich hot subdwarfs: the neon-rich binary EC20817-4939” • 13h45-14h05
3. N. Reindl (flash-talk): “Discovery of hot subdwarfs covered with He-burning ash” • 14h05-14h10
4. T. Pacheco: “A grid of non-LTE fully line-blanketed atmosphere structures and synthetic spectra for subdwarfs” • 14h10-14h30
5. M. Dorsch: “The class of magnetic Helium-sdOs: which mergers are magnetic?” • 14h30-14h50
6. N. Przybilla: “HD144941: obituary for an extreme helium star” • 14h50-15h10
7. N. Singer (flash-talk): “Masses and radii of subdwarf B stars – SED fitting method” • 15h10-15h15

15h15-15h45: Coffee break

SESSION II “Populations of hot subdwarfs: large surveys, synthesis studies, and observational results”

Large surveys

8. S. Geier: “The potential of large spectroscopic surveys for hot subdwarf research” + general intro on population studies • 15h45-16h15
9. R. Culpan: “Extending the catalogues of hot subdwarfs and blue horizontal-branch stars using Gaia eDR3” • 16h15-16h35
10. F. Mattig (flash-talk): “Update on the new hot subdwarf database” • 16h35-16h40
11. H. Dawson: “The first volume-limited sample of hot subdwarf stars” • 16h40-17h00
12. F. Mattig: “Radial velocity of sdB stars from SDSS” • 17h00-17h20

17h20: Adjourn
18h: Welcome Reception

Tuesday 14 June, 2022

Populations simulations/synthesis studies

13. Z. Han (pre-recorded, Q/A live on Zoom): “What we can learn from sdOB binaries” • 9h-9h20
14. T. Pacheco (flash-talk): “How much hot low-mass stars contribute for the integrated light of old stellar population” • 9h20-9h25
15. A. Bobrick: “Modelling short- and long-period sdB populations with MESA” • 9h25-9h45
16. M. Cabezas (flash-talk): “Fourier disentangling of hot subdwarf binaries: the case of JL 227” • 9h45-9h50
Observational results
17. U. Heber: “The fastest hot subdwarfs revisited” • 9h50-10h10
18. P. Neunteufel: « Properties and applications of a predicted population of runaway He-sdO/B stars ejected from single degenerate He-donor SNe” • 10h10-10h30

10h30-11h00 : Coffee break

19. M. Pritzkuleit: “The HOTSHotS Project – The search for Hyperrunaway O type Supernova-ejected Hot Subdwarfs” • 11h00-11h20
20. C. Aubrey: “The origin of subdwarf B stars” • 11h20-11h40

11h40-12h30: Closing discussion on sessions Atmospheres and Populations 

12h30-14h: Lunch (cold buffet)

SESSION III “Pulsations in hot subdwarfs and related objects and asteroseismology”

21. V. Van Grootel: “Short-period hot subdwarf pulsators in TESS Southern hemisphere: new and old friends” + general intro on pulsations on hot subdwarfs • 14h-14h30
22. M. Reed: “Kepler, K2, and TESS observations: ensemble and comparative asteroseismology” • 14h30-14h50
23. M. Uzundag (flash-talk): “Asteroseismology of hot subdwarf B stars observed with TESS: discovery of two new gravity mode pulsating stars” • 14h50-14h55
24. W. Su: “TIC 441725813: a possible hybrid sdB pulsator with differential radial rotation in short-period binary” • 14h55-15h15
25. R. Silvotti: “Differential rotation and synchronization in sdB+dM short-period binaries: the case of TIC 137608661” • 15h15-15h35

15h35-16h05: Coffee break

26. C. Johnston (flash-talk): “Predicting a new class of intermediate mass pulsating stripped-envelope stars” • 16h05-16h10
27. L. Antunes Amaral: “Search for new variable extremely-low-mass white dwarf stars” • 16h10-16h30
28. P. Pietrukowicz: “New observational results on Blue Large-Amplitude Pulsators” • 16h30-16h50
29. C. Bradshaw: ”Properties and evolutionary history of rare pulsating subdwarfs” • 16h50-17h10

SESSION IV “Hot subdwarfs and related objects as laboratories for stellar physics”

30. C. Schürmann: “The spins of stripped B stars support magnetic internal angular momentum transport” • 17h10-17h30 
31. N. Giammichele (flash-talk): “Weighing the evidence for bigger cores: how well can we constrain convective mixing treatments based on observations?” • 17h30-17h35

17h35: Adjourn

Wednesday 15 June, 2022

(cont. SESSION IV “Hot subdwarfs and related objects as laboratories for stellar physics”)

32. S. Charpinet: “HD 265435: an outstanding laboratory to study stellar pulsations in distorted stars”  + general intro on the potential of hot subdwarfs as laboratories • 9h15-9h45
33. I. Pelisoli (flash-talk): “Detection of eclipses in the candidate supernova progenitor HD 265435” • 9h45-9h50
34. L. Fellay (flash-talk): “3D static models of close, synchronized binaries in hydrostatic equilibrium” • 9h50-9h55
35. W. Zong (pre-recorded, Q/A live on Zoom): “Oscillation mode variability in compact pulsators from Kepler/K2 to TESS” • 9h55-10h15

10h15-10h45: Coffee break

36. K. Xing (pre-recorded, Q/A live on Zoom): “Flare events in compact stars from TESS” • 10h45-11h05
37. T. Battich: “Have some sdOBs a hidden past of turbulent nuclear reactors?” • 11h05-11h25

11h25-12h30: Closing discussion on sessions Pulsations and Laboratories 

12h30- : Lunch (sandwiches)

Afternoon:

• GAIA DR3 brainstorming (Wittert room)
• 16h-17h or 17-18h: brewery visit
• 18h: apero and conference dinner 

Thursday 16 June, 2022

SESSION V “Origin and evolution of hot subdwarf stars”

38. I. Pelisoli: “Observational evidence that binary interaction is always required to form hot subdwarf stars” + general intro on standard and alternative pathways for hot subdwarf formation • 9h30-10h00
39. M. Uzundag: “Volume-limited sample of low-mass red-giant stars, the progenitors of hot subdwarf stars” • 10h-10h20
40. H. Preece: “Forming sdB stars from hierarchical triples” • 10h20-10h40
41. P. Podsiadlowski: “The spin-down of white dwarf mergers” • 10h40-11h00

11h00-11h30: Coffee break

42. JJ Hermes: “Pre- and post- sdBs with uncommon core masses” • 11h30-11h50
43. E. Bauer: “binary sdB+WD systems as progenitors for AM CVn systems:” • 11h50-12h10
44. N. Reindl: “Update on UHE white dwarfs” • 12h10-12h30

12h30-14h00: Lunch (cold buffet)

SESSION VI “Binaries: massive, compact, low-mass and substellar companions to hot subdwarfs and related objects”

VI.I Properties of hot subdwarf in binaries

45. V. Schaffenroth: “Hot subdwarfs in close binaries seen from space”  + general intro on the zoo of companions to hot subdwarfs • 14h00-14h30
46. B. Barlow: “Set phases to stun: classifying binary hot subdwarfs and quantifying their properties via Fourier Diagnostics from TESS photometry” – • 14h30-14h50
47. E. Snowdon (flash-talk): “The binary fraction of He-rich hot subdwarfs from SALT and TESS” • 14h50-14h55
48. I. Lopez: “High-speed photometry of new variable hot subdwarfs from Gaia eDR3s • 14h55-15h15
49. B. Smith: “A 3-day companion to the hot subdwarf BPM 36430 detected with TESS pulse timing and confirmed with radial velocities” • 15h15-15h35
50. F. Molina (flash-talk): “Two wide O-type subdwarf binaries BD-11°162 and Feige 80” • 15h35-15h40

15h40-16h10: Coffee break

VI.II Planets around hot subdwarfs?

51. F. Pozuelos: “A search for transiting planets around hot subdwarfs – Data, tools, performances and follow-up observations” • 16h10-16h30
52. A. Thuillier: “A search for transiting planets around hot subdwarfs – Results from TESS Cycle 1” • 16h30-16h50
53. O. Basturk: “Eclipse Timing Variation in PCEB systems” • 16h50-17h10

VI.III Hot subdwarfs in ultracompact binaries and as seen from high energies

54. S. Mereghetti: “The high-energy view of hot subdwarfs with collapsed companions” • 17h10-17h30
55. V. Schaffenroth (flash-talk) “The eclipsing high-mass X-ray binary HD 49798 as seen by TESS” • 17h30-17h35

17h35: Adjourn

Friday 17 June, 2022

(VI.III cont.)

56. Y. Nazé: “sdO and peculiar X-ray emissions” •  9h15-9h35
57. T. Kupfer: “The systematic search of compact hot subdwarf binaries with white dwarf companions” • 9h35-9h55
58. K. Deshmukh: “Detailed follow-up of the first accreting hot subdwarf binary candidate” • 9h55-10h15
59. E. Stringer (flash-talk): “Detailed follow-up studies of three ultra-compact sdB binaries” • 10h15-10h20

10h20-10h50: Coffee break

10h50-11H50: Closing discussion on sessions Origins and Binaries

11h50-12h30: General closing Discussion 

12h30: Lunch (sandwiches)