A Herschel resolved debris disc around HD 105211

作者：Hengst, S.^*; Marshall, J. P.; Horner, J.; Marsden, S. C.

来源：Monthly Notices of the Royal Astronomical Society, 2017, 468(4): 4725-4734.

DOI：10.1093/mnras/stx753

• planet-disc interactions
• circumstellar matter
• stars: individual: HD 105211 infrared: stars

Debris discs are the dusty aftermath of planet formation processes around main-sequence stars. Analysis of these discs is often hampered by the absence of any meaningful constraint on the location and spatial extent of the disc around its host star. Multi-wavelength, resolved imaging ameliorates the degeneracies inherent in the modelling process, making such data indispensable in the interpretation of these systems. The Herschel Space Observatory observedHD105211 (eta Cru, HIP 59072) with its Photodetector Array Camera and Spectrometer (PACS) instrument in three far-infrared wavebands (70, 100 and 160 mu m). Here we combine these data with ancillary photometry spanning optical to far-infrared wavelengths in order to determine the extent of the circumstellar disc. The spectral energy distribution and multi-wavelength resolved emission of the disc are simultaneously modelled using a radiative transfer and imaging codes. Analysis of the Herschel/ PACS images reveals the presence of extended structure in all three PACS images. From a radiative transfer model we derive a disc extent of 87.0 +/- 2.5 au, with an inclination of 70.7+/- 2.2. to the line of sight and a position angle of 30.1+/- 0.5.. Deconvolution of the Herschel images reveals a potential asymmetry but this remains uncertain as a combined radiative transfer and image analysis replicates both the structure and the emission of the disc using a single axisymmetric annulus.main-

• 出版日期2017-7