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@article{1686952, author = {Kurfürst, Petr and Pejcha, Ondřej and Krtička, Jiří}, article_location = {Les Ulis}, article_number = {October 2020}, doi = {http://dx.doi.org/10.1051/0004-6361/202039073}, keywords = {supernovae: general – circumstellar matter – shock waves – stars: emission-line; Be – polarization}, language = {eng}, issn = {0004-6361}, journal = {Astronomy and Astrophysics}, title = {Supernova explosions interacting with aspherical circumstellar material: implications for light curves, spectral line profiles, and polarization}, url = {https://ui.adsabs.harvard.edu/abs/2020A&A...642A.214K}, volume = {642}, year = {2020} }
TY - JOUR ID - 1686952 AU - Kurfürst, Petr - Pejcha, Ondřej - Krtička, Jiří PY - 2020 TI - Supernova explosions interacting with aspherical circumstellar material: implications for light curves, spectral line profiles, and polarization JF - Astronomy and Astrophysics VL - 642 IS - October 2020 SP - 1-20 EP - 1-20 PB - EDP Sciences SN - 00046361 KW - supernovae: general – circumstellar matter – shock waves – stars: emission-line KW - Be – polarization UR - https://ui.adsabs.harvard.edu/abs/2020A&A...642A.214K L2 - https://ui.adsabs.harvard.edu/abs/2020A&A...642A.214K N2 - Some supernova (SN) explosions show evidence for an interaction with a pre-existing nonspherically symmetric circumstellar medium (CSM) in their light curves, spectral line profiles, and polarization signatures. The origin of this aspherical CSM is unknown, but binary interactions have often been implicated. To better understand the connection with binary stars and to aid in the interpretation of observations, we performed two-dimensional axisymmetric hydrodynamic simulations where an expanding spherical SN ejecta initialized with realistic density and velocity profiles collide with various aspherical CSM distributions. We consider CSM in the form of a circumstellar disk, colliding wind shells in binary stars with different orientations and distances from the SN progenitor, and bipolar lobes representing a scaled down version of the Homunculus nebula of eta Car. We study how our simulations map onto observables, including approximate light curves, indicative spectral line profiles at late times, and estimates of a polarization signature. We find that the SN–CSM collision layer is composed of normal and oblique shocks, reflected waves, and other hydrodynamical phenomena that lead to acceleration and shear instabilities. As a result, the total shock heating power fluctuates in time, although the emerging light curve might be smooth if the shock interaction region is deeply embedded in the SN envelope. SNe with circumstellar disks or bipolar lobes exhibit late-time spectral line profiles that are symmetric with respect to the rest velocity and relatively high polarization. In contrast, SNe with colliding wind shells naturally lead to line profiles with asymmetric and time-evolving blue and red wings and low polarization. Given the high frequency of binaries among massive stars, the interaction of SN ejecta with a pre-existing colliding wind shell must occur and the observed signatures could be used to characterize the binary companion. ER -
KURFÜRST, Petr, Ondřej PEJCHA a Jiří KRTIČKA. Supernova explosions interacting with aspherical circumstellar material: implications for light curves, spectral line profiles, and polarization. \textit{Astronomy and Astrophysics}. Les Ulis: EDP Sciences, 2020, roč.~642, October 2020, s.~1-20. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202039073.
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