Polarimetry of the superluminous supernova LSQ14mo: no evidence for significant deviations from spherical symmetry

Abstract

We present the first polarimetric observations of a Type I superluminous supernova (SLSN). LSQ14mo was observed with VLT/FORS2 at five different epochs in the V band, with the observations starting before maximum light and spanning 26 days in the rest frame (z=0.256). During this period, we do not detect any statistically significant evolution (< 2$\sigma$) in the Stokes parameters. The average values we obtain, corrected for interstellar polarisation in the Galaxy, are Q = -0.01% ($\pm$ 0.15%) and U = - 0.50% ($\pm$ 0.14%). This low polarisation can be entirely due to interstellar polarisation in the SN host galaxy. We conclude that, at least during the period of observations and at the optical depths probed, the photosphere of LSQ14mo does not present significant asymmetries, unlike most lower-luminosity hydrogen-poor SNe Ib/c. Alternatively, it is possible that we may have observed LSQ14mo from a special viewing angle. Supporting spectroscopy and photometry confirm that LSQ14mo is a typical SLSN I. Further studies of the polarisation of Type I SLSNe are required to determine whether the low levels of polarisation are a characteristic of the entire class and to also study the implications for the proposed explosion models.

ApJ Letters, 4 Figures, 3 Tables. The previous version was accepted. This version contains minor modifications to match proofs (as much as possible)

References in corpus (14)

• Pulsational pair instability as an explanation for the most luminous supernovae
• Spectropolarimetry of Supernovae
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• A neutron-star-driven X-ray flash associated with supernova SN 2006aj
• Spectroscopy of superluminous supernova host galaxies. A preference of hydrogen-poor events for extreme emission line galaxies
• On the diversity of super-luminous supernovae: ejected mass as the dominant factor
• A non-spherical core in the explosion of supernova SN 2004dj
• Super-luminous supernovae at redshifts of 2.05 and 3.90
• Comprehensive Observations of the Bright and Energetic Type Iax SN 2012Z: Interpretation as a Chandrasekhar Mass White Dwarf Explosion
• Polarized radio emission from a magnetar
• Spectropolarimetry of the Type Ib/c SN 2005bf
• Super Luminous Supernovae as standardizable candles and high redshift distance probes
• Detection of optical linear polarization in the SN2006aj/XRF060218 non-spherical expansion
• Spectropolarimetry of SN 2006aj at 9.6 days

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