Extended Data Fig. 4: Analysis of the stellar tracebacks of the UCL and LCC clusters, whose progenitors were likely responsible for the supernovae that created the Local Bubble.

The scatter points indicate the positions of the current cluster members of UCL and LCC, which are colored as a function of time (spanning the present day in pink to 30 Myr ago in black). Panel a: Using Hipparcos data and adopting a solar peculiar motion (U_☉, V_☉, W_☉) = (10.0, 5.2, 7.2) km/s⁴⁶, previous literature^6,7 find that UCL and LCC were born outside the Local Bubble (black trace⁴) 15 Myr ago and only entered its present-day boundary in the past 5 Myr (reproduced from Fig. 6 in ref. ⁶). Panel b: We attempt to reproduce the results from previous literature^6,7 using the same data and solar motion, but are unable to account for the curvature of the tracebacks, finding the UCL and LCC formed just inside its northern boundary 15 Myr ago. Panel c: Using a different value for the solar motion, (U_☉, V_☉, W_☉) = (10.0, 15.4, 7.8) km/s⁴¹ but the same Hipparcos data, we find that UCL and LCC were born near the center of the Local Bubble. Panel d: Finally, using updated Gaia data but the same adopted solar motion used in panel c. (U_☉, V_☉, W_☉) = (10.0, 15.4, 7.8) km/s⁴¹, we also find that UCL and LCC were born near the center of the bubble, given an updated model for its surface¹³.