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Probing the Thermal Structure in Circumstellar Disks with APEX

Kooij, G.R. (2017) Probing the Thermal Structure in Circumstellar Disks with APEX. Bachelor's Thesis, Astronomy.

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In this Bachelor thesis I present new APEX data on the two group II circumstellar disks HD104237 and HD142666. The aim is to infer the radial temperature distribution using the peak separation of the double-peaked Keplerian rotation line profiles of our data on the CO 6-5 rotational line, and literature data on lower rotational lines. After rebinning the data to a much lower spectral resolution, we find for HD104237 a $3sigma$ detection. The analysis of the line profile gives a full width at half maximum of 8.6 $pm$ 1.4 km/s, an integrated intensity of 0.25 $pm$ 0.02 K km/s, a peak-to-peak separation of 4.4 $pm$ 0.9 km/s, and a peak intensity of 0.034 $pm$ 0.005 K. The inferred temperature distribution is T$sim$ 116 K at a distance of 85 $pm$ 50 au and T$sim$ 33 K at a distance of 112 $pm$ 51 au. For HD142666 the line is only detected at $2.5sigma$ or less, which is below the threshold for a reliable result. Instead, by integrating the noise in the expected velocity range we find an upper limit of the integrated intensity of 0.20 $pm$ 0.07 K km/s.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Astronomy
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:30
Last Modified: 15 Feb 2018 08:30

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