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Testing the magnetar scenario for superluminous supernovae with circular polarimetry
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 182018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 479, no 4, p. 4984-4990Article in journal (Refereed) Published
Abstract [en]

Superluminous supernovae (SLSNe) are at least similar to 5 times more luminous than common supernovae. Especially hydrogen-poor SLSN-I are difficult to explain with conventional powering mechanisms. One possible scenario that might explain such luminosities is that SLSNe-I are powered by an internal engine, such as a magnetar or an accreting black hole. Strong magnetic fields or collimated jets can circularly polarize light. In this work, we measured circular polarization of two SLSNe-I with the FOcal Reducer and low dispersion Spectrograph (FORS2) mounted at the ESO's Very Large Telescope. PS17bek, a fast-evolving SLSN-I, was observed around peak, while OGLE16dmu, a slowly evolving SLSN-I, was observed 100 d after maximum. Neither SLSN shows evidence of circularly polarized light; however, these non-detections do not rule out the magnetar scenario as the powering engine for SLSNe-I. We calculate the strength of the magnetic field and the expected circular polarization as a function of distance from the magnetar, which decreases very fast. Additionally, we observed no significant linear polarization for PS17bek at four epochs, suggesting that the photosphere near peak is close to spherical symmetry.

Place, publisher, year, edition, pages
2018. Vol. 479, no 4, p. 4984-4990
Keywords [en]
supernovae: general, polarization, supernovae: individual: OGLE16dmu, PS17bek
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-160196DOI: 10.1093/mnras/sty1891ISI: 000441383700050OAI: oai:DiVA.org:su-160196DiVA, id: diva2:1251341
Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2018-09-27Bibliographically approved

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Bulla, MattiaInserra, Cosimo
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