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Dr. Daniel Sablowski

Image of Daniel Sablowski

My interests lie in spectroscopic binary star systems and their evolutionary stages. This includes the determination of the orbital parameters and the separation of the spectra by spectral disentangling, as well as chemical analysis.

For the spectral disentangling the software Spectangular was developed. This software allows the separation of the spectra and the derivation of the orbital parameters.

In the optics group of the AIP my main focus is the development of spectroscopic systems. For this purpose I developed the software SILENT for paraxial calculation of important parameters of spectrographs.

sablowski-optics.com

Optics
Technical Staff
Office: SH/101
Phone: +49 331 7499 279
dsablowskinothing@aip.de

Leibniz-Institut
für Astrophysik Potsdam (AIP)
An der Sternwarte 16
14482 Potsdam
 

Spectangular

Relies on spectra spread over the orbital motion of the components. These n spectra are collected in a vector o, the individual spectra of each component are collected in the solution vector x, and the problem to be solved is

o = Mx

where M is a matrix, reflecting the orbital parameters. The values of these parameters are varied by an optimization algorithm such that the residuum

r = || o - Mx ||

is minimized. Additionally, the code allows to optimize on the individual radial velocities instead of the orbital elements. This allows to work on systems with orbital distortions apart from the two body orbit. However, the code can not determine the flux ratio between the two components. This also depends on the wavelengths and it need to be determined, e.g. from photometric observations (or the equivalent width of the lines may also serve as a criterion). Nevertheless, Spectangular, allows to optimize on the flux ratios as well, but the optimization on the wavelength axis need to be bound to the equation of an SB2 or SB1 system in order to avoid confusion between these two effects.

The software can be downloaded from github.

Publications

Latest refereed publications, retrieved from NASA ADS:

VPNEP: Detailed characterization of TESS targets around the Northern Ecliptic Pole. I. Survey design, pilot analysis, and initial data release
Strassmeier, K. G., Weber, M., Gruner, D., Ilyin, I., Steffen, M., Baratella, M., Järvinen, S., Granzer, T., Barnes, S. A., Carroll, T. A., Mallonn, M., Sablowski, D., ..., 2023
Astronomy and Astrophysics, 671, A7; published March 2023
doi:10.1051/0004-6361/202245255, NASA ADS
Assembly and alignment of the 4-metre multi-object spectroscopic telescope wide field corrector
Cunningham, M. H., ... Brynnel, J., de Jong, R. S., Frey, S., Schroeck, M., Gaebler, M., Sablowski, D., ..., 2023
Journal of Astronomical Telescopes, Instruments, and Systems, 9, 015002; published January 2023
doi:10.1117/1.JATIS.9.1.015002, NASA ADS
Participating AIP sections and groups: Project Management, Milky Way and the Local Volume, Technical Section / Optics
An extensive spectroscopic time series of three Wolf-Rayet stars - II. A search for wind asymmetries in the dust-forming WC7 binary WR137
St-Louis, N., ... Sablowski, D. P., ..., 2020
Monthly Notices of the Royal Astronomical Society, 497, 4, 4448; published October 2020
doi:10.1093/mnras/staa2214, NASA ADS
Participating AIP sections and groups: Technical Section / Optics
The various accretion modes of AM Herculis: Clues from multi-wavelength observations in high accretion states
Schwope, A. D., Worpel, H., Traulsen, I., Sablowski, D., 2020
Astronomy and Astrophysics, 642, A134; published October 2020
doi:10.1051/0004-6361/202037714, NASA ADS
Participating AIP sections and groups: Galaxies and Quasars / X-ray Astronomy, Technical Section / Optics
The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud. Spectroscopy, orbital analysis, formation, and evolution (Corrigendum)
Shenar, T., Sablowski, D. P., ..., 2020
Astronomy and Astrophysics, 641, C2; published September 2020
doi:10.1051/0004-6361/201935684e, NASA ADS
Participating AIP sections and groups: Technical Section / Optics
The STIX Aspect System (SAS): The Optical Aspect System of the Spectrometer/Telescope for Imaging X-Rays (STIX) on Solar Orbiter
Warmuth, A., Önel, H., Mann, G., Rendtel, J., Strassmeier, K. G., Denker, C., ... Anderson, J., Bauer, S.-M., Bittner, W., Dionies, F., Paschke, J., Plüschke, D., Sablowski, D. P., Schuller, F., Senthamizh Pavai, V., Woche, M., ..., 2020
Solar Physics, 295, 7, 90; published July 2020
doi:10.1007/s11207-020-01660-w, NASA ADS
SILENT: Spectrograph simulation and emulation tool
Sablowski, D. P., Vollmann, K., 2020
New Astronomy, 75, 101303; published February 2020
doi:10.1016/j.newast.2019.101303, NASA ADS
Participating AIP sections and groups: Technical Section / Optics
The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud. Spectroscopy, orbital analysis, formation, and evolution
Shenar, T., Sablowski, D. P., ..., 2019
Astronomy and Astrophysics, 627, A151; published July 2019
doi:10.1051/0004-6361/201935684, NASA ADS
Participating AIP sections and groups: Technical Section / Optics
Spectangular: Disentangling variable spectra
Sablowski, D. P., Järvinen, S., Weber, M., 2019
Astronomy and Astrophysics, 623, A31; published March 2019
doi:10.1051/0004-6361/201834836, NASA ADS
Carbon 12C/13C isotope ratio of α Aurigae revised
Sablowski, D. P., Järvinen, S., Ilyin, I., Strassmeier, K. G., 2019
Astronomy and Astrophysics, 622, L11; published February 2019
doi:10.1051/0004-6361/201834663, NASA ADS