13:45 〜 15:15
[PEM11-P15] Investigation of the possibility of detecting exoplanets and exomoons with the future space interferometers SPICE and LIFE
キーワード：系外衛星、中間赤外線、遠赤外線、宇宙干渉計、直接撮像
Direct detection of exoplanetary spectra puts useful constraints on their atmospheric properties and provides insights into planet formation and evolution. It has been successfully carried out for young self-illuminating Jupiter-like planets on distant orbits. However, direct imaging of low-temperature (∼150 K) exoplanets similar to Jupiter has not been possible because of the limited spatial resolution in the far-infrared domain where these cool planets are brightest. The Space Interferometer for Cosmic Evolution (SPICE), the far-infrared space interferometer project planned for the 2030s, will serve as the first opportunity to image planetary systems with high spatial resolution in the far-infrared domain. Improving the spatial resolution by a factor of 10 or more in the same wavelength will enable direct detection of planetary thermal emissions.
In this study, the detectability of exoplanets in SPICE was investigated. Assuming the SPICE specifications, we found that SPICE will be able to directly detect the planetary thermal emissions with a temperature down to ~190 K around solar-type stars and ~100 K around M-type stars. Among already detected planets, 104 planets, 12 of which were detected using the radial velocity method, could be detected.
We also assessed the detectability of exomoons around these cool Jupiter-like planets through the following two methods: (1) the exomoon eclipses, and (2) using possible absorption lines in exomoon spectra. We found that signals of exomoons would not be possible with SPICE within a reasonable observation time.
We will also discuss the application of Large Interferometer For Exoplanets (LIFE), the mid-infrared interferometer planned for the 2040s, highlighting the effect of different starlight-suppression techniques and the wavelength domain between SPICE and LIFE.
In this study, the detectability of exoplanets in SPICE was investigated. Assuming the SPICE specifications, we found that SPICE will be able to directly detect the planetary thermal emissions with a temperature down to ~190 K around solar-type stars and ~100 K around M-type stars. Among already detected planets, 104 planets, 12 of which were detected using the radial velocity method, could be detected.
We also assessed the detectability of exomoons around these cool Jupiter-like planets through the following two methods: (1) the exomoon eclipses, and (2) using possible absorption lines in exomoon spectra. We found that signals of exomoons would not be possible with SPICE within a reasonable observation time.
We will also discuss the application of Large Interferometer For Exoplanets (LIFE), the mid-infrared interferometer planned for the 2040s, highlighting the effect of different starlight-suppression techniques and the wavelength domain between SPICE and LIFE.