期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-021-21176-6
关键词
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资金
- Breakthrough Prize Foundation
- NASA's Science Mission Directorate
- National Centre of Competence in Research PlanetS
- Swiss National Science Foundation
- Fonds de la Recherche Scientifique-FNRS [F.4504.18]
- European Research Council (ERC) under the European Union [819155]
- European Union [337569]
- Wallonia-Brussels Federation
- NASA through the NASA Hubble Fellowship - Space Telescope Science Institute [HSTHF2-51472.001-A]
- NASA [NAS5-26555]
- NSF [AST-1602444]
The study introduces a ground-based mid-infrared observing approach enabling imaging of low-mass temperate exoplanets around nearby stars. The authors demonstrate sensitivity to warm sub-Neptune-sized planets within the habitable zone of alpha Centauri A based on high-quality images from cumulative observations.
Giant exoplanets on wide orbits have been directly imaged around young stars. If the thermal background in the mid-infrared can be mitigated, then exoplanets with lower masses can also be imaged. Here we present a ground-based mid-infrared observing approach that enables imaging low-mass temperate exoplanets around nearby stars, and in particular within the closest stellar system, alpha Centauri. Based on 75-80% of the best quality images from 100h of cumulative observations, we demonstrate sensitivity to warm sub-Neptune-sized planets throughout much of the habitable zone of alpha Centauri A. This is an order of magnitude more sensitive than state-of-the-art exoplanet imaging mass detection limits. We also discuss a possible exoplanet or exozodiacal disk detection around alpha Centauri A. However, an instrumental artifact of unknown origin cannot be ruled out. These results demonstrate the feasibility of imaging rocky habitable-zone exoplanets with current and upcoming telescopes. Imaging of low-mass exoplanets can be achieved once the thermal background in the mid-infrared (MIR) wavelengths can be mitigated. Here, the authors present a ground-based MIR observing approach enabling imaging low-mass temperate exoplanets around nearby stars.
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