期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 522, 期 2, 页码 1662-1668出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stad1027
关键词
planets and satellites: aurorae; planets and satellites: gaseous planets; planets and satellites: magnetic fields; planet-star interactions; radio continuum: planetary systems
In this study, the first radio observations of the exomoon candidate system WASP-69b were conducted. Although no radio emission was detected, upper limits were established and used to estimate the maximum mass-loss from the exomoon candidate.
Exomoons have so far eluded ongoing searches. Several studies have exploited transit and transit timing variations and high-resolution spectroscopy to identify potential exomoon candidates. One method of detecting and confirming these exomoons is to search for signals of planet-moon interactions. In this work, we present the first radio observations of the exomoon candidate system WASP-69b. Based on the detection of alkali metals in the transmission spectra of WASP-69b, it was deduced that the system might be hosting an exomoon. WASP-69b is also one of the exoplanet systems that will be observed as part of JWST cycle-1 GTO. This makes the system an excellent target to observe and follow up. We observed the system for 32 h at 150 and 218 MHz using the upgraded Giant Metrewave Radio Telescope (uGMRT). Though we do not detect radio emission from the systems, we place strong 3 sigma upper limits of 3.3 mJy at 150 MHz and 0.9 mJy at 218 MHz. We then use these upper limits to estimate the maximum mass-loss from the exomoon candidate.
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