期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 908, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/abdf57
关键词
Polarimetry; Direct imaging; Circumstellar disks; Circumstellar dust; Exoplanets
资金
- CNRS (France)
- MPIA (Germany)
- INAF (Italy)
- FINES (Switzerland)
- NOVA (The Netherlands)
- European Commission Sixth and Seventh Framework Programmes as part of the Optical Infrared Coordination Network for Astronomy (OPTICON) [RII3-Ct2004-001566, 226604, 312430]
- Netherlands Organisation for Scientific Research (NWO) TOP-1 grant as part of the research program Herbig Ae/Be stars, Rosetta stones for understanding the formation of planetary systems [614.001.552]
- NASA through the NASA Hubble Fellowship - Space Telescope Science Institute [HST-HF2-51460.001-A, HST-HF251427.001-A]
- NASA [NAS5-26555, 17-K2GO6-0030, NNX15AD53G]
- European Research Council under the European Union's Horizon 2020 research and innovation program [714769]
- Deutsche Forschungsgemeinschaft [FOR 2634/1]
- Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy [EXC-2094-390783311]
- National Aeronautics and Space Administration [80NM0018D0004]
- Jet Propulsion Laboratory Exoplanetary Science Initiative
- ESO
- NASA [803244, NNX15AD53G] Funding Source: Federal RePORTER
Gas-rich circumstellar disks are crucial for planet formation, and their evolution can significantly impact the resulting planet population. Observations of the nearby star system SU Aur using VLT/SPHERE have revealed detailed structures within the disk, including dust tails connected to the Keplerian disk and a shadow lane from a misaligned inner component. These observations suggest late material infall in SU Aur, influencing the evolution of circumstellar disks and potentially contributing to spin-orbit misalignment in evolved exoplanet systems.
Gas-rich circumstellar disks are the cradles of planet formation. As such, their evolution will strongly influence the resulting planet population. In the ESO DESTINYS large program, we study these disks within the first 10 Myr of their development with near-infrared scattered-light imaging. Here we present VLT/SPHERE polarimetric observations of the nearby class II system SU Aur in which we resolve the disk down to scales of similar to 7 au. In addition to the new SPHERE observations, we utilize VLT/NACO, HST/STIS, and ALMA archival data. The new SPHERE data show the disk around SU Aur and extended dust structures in unprecedented detail. We resolve several dust tails connected to the Keplerian disk. By comparison with ALMA data, we show that these dust tails represent material falling onto the disk. The disk itself shows an intricate spiral structure and a shadow lane, cast by an inner, misaligned disk component. Our observations suggest that SU Aur is undergoing late infall of material, which can explain the observed disk structures. SU Aur is the clearest observational example of this mechanism at work and demonstrates that late accretion events can still occur in the class II phase, thereby significantly affecting the evolution of circumstellar disks. Constraining the frequency of such events with additional observations will help determine whether this process is responsible for the spin-orbit misalignment in evolved exoplanet systems.
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