High-resolution ALMA and <i>HST</i> images of q1 Eri: an asymmetric debris disc with an eccentric Jupiter

We present \textit{ALMA} 1.3 mm and 0.86 observations of the nearby (17.34 pc) F9V star q1 Eri (HD 10647, HR 506). This system, with age ${\sim}1.4$ Gyr, hosts a ${\sim}2$ au radial velocity planet debris disc highest fractional luminosity closest 300 FGK type stars. The images, resolution ${\sim}0.5''$, reveal broad (34{-}134 au) belt millimeter emission inclined by $76.7{\pm}1.0$ degrees maximum brightness at $81.6{\pm}0.5$ au. images an asymmetry, higher flux near southwest ansa, which is also closer to star. Scattered light observed Hubble Space Telescope asymmetric, being more radially extended northeast. fit parametric models place constraints on morphology, radius, width, dust mass, scale height. find ansa asymmetry best fitted clump inner edge disc, consistent perturbations from mass $8 M_{\oplus} {-} 11 M_{\rm Jup}$ ${\sim}60$ that may have migrated outwards, similar Neptune in our Solar System. If measured vertical aspect ratio $h{=}0.04{\pm}0.01$ due dynamical interactions then this requires perturbers sizes ${>}1200$ km. tentative evidence for excess within 10 au, $70{\pm}22\, \mu$Jy, be planetesimal belt. no CO gas, but set upper bound gas $4{\times}10^{-6}$ M$_{\oplus}$ ($3\,\sigma$), cometary abundances