Imaged planet/substellar companion at [SCH06] J0359+2009

Interesting presentation

Leveraging Large-Sky Surveys in the Gaia Era to Reveal the Nature of Wide Substellar Companions

Quote :

The last decade has seen the discovery of a growing population of planetary-mass companions (≲20 MJup; PMCs) to young stars which are often still in the star-forming regions where they formed. These objects have been found at wide separations (>100 au) from their host stars, challenging existing models of both star and planet formation. Demographic trends with mass and separation should distinguish between these formation models. While the number of wide-orbit PMCs known has increased slowly, there is tremendous opportunity to search for wide companions in publicly available legacy data sets (e.g., Spitzer/IRAC, Pan-STARRS, UKIDSS, VHS). Furthermore, with the Gaia mission revolutionizing our understanding of the stars in the Milky Way by precisely mapping their positions and movements, an additional opportunity arises to efficiently discover more wide substellar and planetary-mass companions. In this talk I will present my efforts to increase the number of wide-orbit PMCs known through an automated PSF-subtraction pipeline I developed. I will then present how I utilized Gaia to confirm a ρ = 4.66" (540 au), M = 20 M_Jup companion to [SCH06] J0359+2009, a young brown dwarf in Taurus, and describe my ongoing follow-up observations to characterize this system. Finally, I will conclude by reviewing the outlook for future Gaia data releases and how it will further our understanding of binary systems into the planetary-mass regime.

Star [SCH06] J0359+2009's SIMBAD entry is
2MASS J03590986+2009361.

Actually the candidate was reported since 2019.  

Searching for Wide Companions and Identifying Circum(sub)stellar Disks through PSF-Fitting of Spitzer/IRAC Archival Images

Quote :

Direct imaging surveys have discovered wide-orbit planetary-mass companions that challenge existing models of both star and planet formation, but their demographics remain poorly sampled. We have developed an automated binary companion point spread function (PSF) fitting pipeline to take advantage of Spitzer's infrared sensitivity to planetary-mass objects and circum(sub)stellar disks, measuring photometry across the four IRAC channels of 3.6 μm, 4.5 μm, 5.8 μm, and 8.0 μm. We present PSF-fitting photometry of archival Spitzer/IRAC images for 11 young, low-mass (M∼0.044-0.88 M_⊙; M7.5-K3.5) members of three nearby star-forming regions (Chameleon, Taurus, and Upper Scorpius; d∼ 150 pc; τ∼ 1-10 Myr) that host confirmed or candidate faint companions at ρ=1.68′′−7.31′′. We recover all system primaries, six confirmed, and two candidate low-mass companions in our sample. We also measure non-photospheric [3.6]−[8.0] colors for three of the system primaries, four of the confirmed companions, and one candidate companion, signifying the presence of circumstellar or circum(sub)stellar disks. We furthermore report the confirmation of a ρ=4.66′′ (540 au) companion to [SCH06] J0359+2009 which was previously identified as a candidate via imaging over five years ago, but was not studied further. Based on its brightness (M[3.6]=8.53 mag), we infer the companion mass to be M=20±5 M_Jup given the primary's model-derived age of 10 Myr. Our framework is sensitive to companions with masses less than 10 M_Jup at separations of ρ=300 au in nearby star-forming regions, opening up a new regime of parameter space that has yet to be studied in detail, discovering planetary-mass companions in their birth environments and revealing their circum(sub)stellar disks.

Now it seems to be confirmed.