YSES 2

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Das Spectro-Polarimetric High-Contrast Exoplanet Research (SPHERE) Instrument am VLT verwendet Adaptive Optik und koronografische Technik zur direkten Abbildung von Exoplaneten. Im Rahmen des The Young Suns Exoplanet Survey (YSES) Programms wurde jetzt ein weiteres Exemplar mit einem extrem weiten Orbit mit der Bezeichnung YSES 2 gefunden:

Discovery of a directly imaged planet to the young solar analog YSES 2

We report the discovery of YSES 2b, a co-moving, planetary-mass companion to the K1 star YSES 2 (TYC 8984-2245-1, 2MASS J11275535-6626046). The primary has a Gaia EDR3 distance of 110 pc, and we derive a revised mass of 1.1 M and an age of approximately 14 Myr. We detect the companion in two observing epochs southwest of the star at a position angle of 205° and with a separation of ∼1.05", which translates to a minimum physical separation of 115 au at the distance of the system. Photometric measurements in the H and Ks bands are indicative of a late L spectral type, similar to the innermost planets around HR 8799. We derive a photometric planet mass of 6.3 +1.6/−0.9 M_Jup using AMES-COND and AMES-dusty evolutionary models; this mass corresponds to a mass ratio of q = (0.5 ± 0.1) % with the primary. This is the lowest mass ratio of a direct imaging planet around a solar-type star to date ... We can exclude additional companions with masses greater than 13 M_Jup in the full field of view of the detector we can rule out further objects that are more massive than 6 M_Jup.

Giant planet at large distance from sun-like star puzzles astronomers

A team of astronomers led by Dutch scientists has directly imaged a giant planet orbiting at a large distance around a sun-like star. Why this planet is so massive and how it got to be there is a mystery. The large distance from the planet to the star presents a puzzle to astronomers because it does not seem to fit well-known models for the formation of large gaseous planets.

giantplaneta.jpg

A direct image of the exoplanet YSES 2b (bottom right) and its star (centre). The star is blocked by a so-called coronagraph.
Credit: ESO/SPHERE/VLT/Bohn et al.
 
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