Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 491, Issue 1, Pages 1335-1347Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz3090
Keywords
accretion, accretion discs; hydrodynamics; protoplanetary discs; circumstellar matter; submillimetre: planetary systems
Categories
Funding
- DISCSIM project - European Research Council under ERC-2013-ADG [341137]
- Netherlands Organisation for Scientific Research (NWO) [016.Veni.192.233]
- BEIS capital funding via STFC capital grants [ST/P002307/1, ST/R002452/1]
- BEIS capital funding via STFC operations grant [ST/R00689X/1]
- ANR of France [ANR-16-CE31-0013]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [823823]
- Netherlands Organisation for Scientific Research (NWO) TOP-1 grant as part of the research programme 'Herbig Ae/Be stars, Rosetta stones for understanding the formation of planetary systems' [614.001.552]
- ETH Zurich Postdoctoral Fellowship Program
- STFC [ST/T001550/1, ST/L000636/1, ST/T001348/1, ST/M006530/1, ST/P002447/1, ST/R002452/1, ST/P002307/1, ST/P000673/1, ST/J005673/1, ST/R001049/1, ST/M007618/1, ST/T001569/1, ST/T00049X/1, ST/R000832/1, ST/K00333X/1, ST/R00689X/1, ST/T001372/1, ST/S002529/1, ST/M007065/1, ST/M007006/1, ST/S003762/1, ST/R001006/1, ST/M007073/1, ST/M006948/1, ST/V002376/1, ST/R001014/1, ST/P003400/1] Funding Source: UKRI
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Scattered light high-resolution imaging of the protoplanetary disc orbiting HD100453 shows two symmetric spiral arms, possibly launched by an external stellar companion. In this paper, we present new, sensitive high-resolution (similar to 30 mas) Band 7 ALMA observations of this source. This is the first source where we find counterparts in the sub-mm continuum to both scattered light spirals. The CO J = 3-2 emission line also shows two spiral arms; in this case, they can be traced over a more extended radial range, indicating that the southern spiral arm connects to the companion position. This is clear evidence that the companion is responsible for launching the spirals. The pitch angle of the submillimetre continuum spirals (similar to 6 degrees) is lower than the one in scattered light (similar to 16 degrees). We show that hydrodynamical simulations of binary-disc interaction can account for the difference in pitch angle only if one takes into account that the mid-plane is colder than the upper layers of the disc, as expected for the case of externally irradiated discs.
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