Fig. 1: Early imaging of nova V1674 Her reveals a shift from spherical symmetry with potential multiple outflows.
From: Multiple outflows and delayed ejections revealed by early imaging of novae
a, Multiple-ejection schematic illustration—an early slower flow followed near optical peak by a faster outflow; their collision produces GeV γ-ray-emitting shocks (purple arrows). b, CHARA images at t = 2.2 and 3.2 days after discovery (t0 = 2021 June 12.19 UT; Supplementary Information), reconstructed with BSMEM (Methods). The images show a central elongated component surrounded by an extended structure elongated roughly perpendicular to it; we interpret the inner feature as the slow flow and the extended feature as the fast outflow. c, Hβ spectral line profiles taken on days 0.7 and 2 since t0. The dashed orange, blue and green lines represent vrad = 0 km s−1, −3,800 km s−1 and −5,500 km s−1 relative to rest wavelength, respectively. d, The AAVSO visible (green stars for V-band and blue points for visual measurements, noted Vis.) and GeV γ-rays (black squares for detections and magenta triangles for 1σ upper limits, noted UL in the legend) light curves of V1674 Her. The error bars represent 1 − σ uncertainties. The vertical dashed lines represent the dates of the CHARA imaging.
