Azimuthal temperature variations in ISO-Oph 2 from multifrequency ALMA observations

0583630 - ASÚ 2024 RIV US eng J - Journal Article
Casassus, S. … Total 11 authors
Azimuthal temperature variations in ISO-Oph 2 from multifrequency ALMA observations.
Monthly Notices of the Royal Astronomical Society. Roč. 526, č. 1 (2023), s. 1545-1558. ISSN 0035-8711. E-ISSN 1365-2966
Research Infrastructure: EU-ARC.CZ III - 90259
Keywords : interferometric techniques * protoplanetary discs * stars pre-main-sequence
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.8, year: 2022
Method of publishing: Limited access
https://doi.org/10.1093/mnras/stad1981

We report on new ALMA continuum observations of this system at 97.5, 145, and 405 GHz, which reveal strong morphological variations. Multifrequency positional alignment allows us to interpret these spectral variations in terms of underlying physical conditions. ISO-Oph 2A is remarkably offset from the centroid of its ring, at all frequencies, and the disc is lopsided, pointing at gravitational interactions. However, the dust temperature also varies in azimuth, with two peaks whose direction connects with HD 147889, the earliest-type star in the Ophiuchus complex, suggesting that it is the dominant heat source. The stellar environment of ISO-Oph 2 appears to drive both its density structure and its thermal balance.
Permanent Link: https://hdl.handle.net/11104/0351647