q1 Eri: a solar-type star with a planet and a dust belt
R. Liseau, C. Risacher, A. Brandeker, C. Eiroa, M. Fridlund, R., Nilsson, G. Olofsson, G. Pilbratt, P. Thebault

TL;DR
This study investigates the q1 Eri star system, revealing a dust belt and a planet, and providing insights into the physical characteristics of planetary disks around solar-type stars through submillimeter observations.
Contribution
First submillimeter detection of dust around q1 Eri, revealing a cold dust belt and constraining disk properties, advancing understanding of star-planet-disk systems.
Findings
Detected extended dust emission at 870 microns.
Identified a cold dust belt at 300 AU from the star.
Suggested possible presence of an unseen outer planet.
Abstract
Only very few solar-type stars exhibiting an infrared excess and harbouring planets are known to date. Indeed, merely a single case of a star-planet-disk system has previously been detected at submillimeter (submm) wavelengths. Consequently, one of our aims is to understand the reasons for these poor statistics, i.e., whether these results reflected the composition and/or the physics of the planetary disks or were simply due to observational bias and selection effects. Finding more examples would be very significant. The selected target, q1 Eri, is a solar-type star, which was known to possess a planet, q1 Eri b, and to exhibit excess emission at IRAS wavelengths, but had remained undetected in the millimeter regime. Therefore, submm flux densities would be needed to better constrain the physical characteristics of the planetary disk. Consequently, we performed submm imaging…
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