Yamazaki, RyoHayasaki, KimitakeLoeb, Abraham2017-05-312016Yamazaki, Ryo, Kimitake Hayasaki, and Abraham Loeb. 2016. “Optical–infrared Flares and Radio Afterglows by Jovian Planets Inspiraling into Their Host Stars.” Monthly Notices of the Royal Astronomical Society 466 (2) (December 12): 1421–1427. doi:10.1093/mnras/stw3207.0035-8711http://nrs.harvard.edu/urn-3:HUL.InstRepos:32750933When a planet inspirals into its host star, it releases gravitational energy which is converted into an expanding bubble of hot plasma. We study the radiation from the bubble and show that it includes prompt optical-infrared emission and a subsequent radio afterglow. The prompt emission from M31 and Large Magellanic Cloud is detectable by optical-near infrared transient surveys with a large field of view. The subsequent radio afterglows are detectable for 103−4~years. The event rate depends on uncertain parameters in the formation and dynamics of giant planets. Future observation of the rate will constrain related theoretical models. If the event rate is high (> a few events per year), the circumstellar disk must typically be massive as suggested by recent numerical simulations.en-USradiation mechanisms: non-thermalradiation mechanisms: thermalplanet-star interactionsinfrared: planetary systemsradio continuum: planetary systemsJournal Article2017-02-1420152017-05-3110.1093/mnras/stw3207