Leiden University Student Repository

Sturm, Ardjan (2018)

Resolved spectroscopy of planet forming disks with SPHERE/IFS

Bachelor thesis | Natuurkunde (BSc)

Context. Much data from the integral field spectroscope (IFS) of SPHERE, the high contrast imager of the VLT, of circumstellar disks is yet unpublished, since this data is always collected in parallel with IRDIS, which is much easier to reduce and analyze. Aims. We search for a good and reliable way to reduce raw IFS data and study the effects of different post-processing methods on the morphology of protoplanetary disks. Methods. We used the common pipeline of ESO to reduce spatially resolved spectral IFS data (YJ band) of RXJ1615.3-3255 and applied classical ADI, classical SDI and classical RDI on the data. Results. We detected a ring, an arc and an inner disk component in both the ADI and SDI image, the ring is detected in the RDI image as well. We conclude that we can trust the SDI data the best around the minor axis of the ring since ADI and RDI have to deal with self-subtraction and over subtraction in that region, the other parts of the ring can be trusted the best in the ADI...Show moreContext. Much data from the integral field spectroscope (IFS) of SPHERE, the high contrast imager of the VLT, of circumstellar disks is yet unpublished, since this data is always collected in parallel with IRDIS, which is much easier to reduce and analyze. Aims. We search for a good and reliable way to reduce raw IFS data and study the effects of different post-processing methods on the morphology of protoplanetary disks. Methods. We used the common pipeline of ESO to reduce spatially resolved spectral IFS data (YJ band) of RXJ1615.3-3255 and applied classical ADI, classical SDI and classical RDI on the data. Results. We detected a ring, an arc and an inner disk component in both the ADI and SDI image, the ring is detected in the RDI image as well. We conclude that we can trust the SDI data the best around the minor axis of the ring since ADI and RDI have to deal with self-subtraction and over subtraction in that region, the other parts of the ring can be trusted the best in the ADI and RDI data. The disk signal appears to be red, but further research is needed to conclude whether this effect is astrophysical or not.Show less

spectroscopy

SPHERE

IFS

protoplanetary disk

planet forming disk

Author

Sturm, Ardjan

Faculty

Faculty of Science

Supervisors

Kenworthy, Matthew

ECTS Credits

4

Language

en