2024/07/07 by Luis F. Rodrı́guez, Rodriguez, Luis F., Luis A. Zapata +1
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #Solar and Stellar Astrophysics (astro-ph.SR)
paper · pdf · doi:10.48550/arxiv.2407.05479
openalex publication_date 2024/07/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
HR 8799 is an A5/F0 V star where exoplanets were first directly imaged. Four exoplanets were found within ≃ 2\rlap.''0 from the star. Here we report the VLA detection of a faint (19.1±2.7 μJy) radio continuum (3.0 GHz) source projected at ≃ 2\rlap.''2 from the star. The \sl a priori \rm probability of finding a background source with this flux density within a radius of 2\rlap.''2 is only 0.0046. However, the astrometry made with the VLA and ALMA images, separated by 5.5 years, indicates no significant proper motions and rules out the association of the radio source with the HR 8799 system and suggests it is a background millimeter galaxy with dust emission in the millimeter and partially thick synchrotron emission in the centimeter.