Early Ultra-Violet observations of type IIn supernovae constrain the asphericity of their circumstellar material. (arXiv:2001.05518v1 [astro-ph.HE])

Early Ultra-Violet observations of type IIn supernovae constrain the asphericity of their circumstellar material. (arXiv:2001.05518v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Soumagnac_M/0/1/0/all/0/1">Maayane T. Soumagnac</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ofek_E/0/1/0/all/0/1">Eran O. Ofek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liang_J/0/1/0/all/0/1">Jingyi Liang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gal_yam_A/0/1/0/all/0/1">Avishay Gal-yam</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nugent_P/0/1/0/all/0/1">Peter Nugent</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yang_Y/0/1/0/all/0/1">Yi Yang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cenko_S/0/1/0/all/0/1">S. Bradley Cenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sollerman_J/0/1/0/all/0/1">Jesper Sollerman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Perley_D/0/1/0/all/0/1">Daniel A. Perley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Andreoni_I/0/1/0/all/0/1">Igor Andreoni</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barbarino_C/0/1/0/all/0/1">Cristina Barbarino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burdge_K/0/1/0/all/0/1">Kevin B. Burdge</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bruch_R/0/1/0/all/0/1">Rachel J. Bruch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+De_K/0/1/0/all/0/1">Kishalay De</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dugas_A/0/1/0/all/0/1">Alison Dugas</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fremling_C/0/1/0/all/0/1">Christoffer Fremling</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Graham_M/0/1/0/all/0/1">Melissa L. Graham</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hankins_M/0/1/0/all/0/1">Matthew J. Hankins</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Strotjohann_N/0/1/0/all/0/1">Nora Linn Strotjohann</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moran_S/0/1/0/all/0/1">Shane Moran</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Neill_J/0/1/0/all/0/1">James D. Neill</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schulze_S/0/1/0/all/0/1">Steve Schulze</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shupe_D/0/1/0/all/0/1">David L. Shupe</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sipocz_B/0/1/0/all/0/1">Brigitta M. Sipocz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Taggart_K/0/1/0/all/0/1">Kirsty Taggart</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tartaglia_L/0/1/0/all/0/1">Leonardo Tartaglia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Walters_R/0/1/0/all/0/1">Richard Walters</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yan_L/0/1/0/all/0/1">Lin Yan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yao_Y/0/1/0/all/0/1">Yuhan Yao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yaron_O/0/1/0/all/0/1">Ofer Yaron</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bellm_E/0/1/0/all/0/1">Eric C. Bellm</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cannella_C/0/1/0/all/0/1">Chris Cannella</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dekany_R/0/1/0/all/0/1">Richard Dekany</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Duev_D/0/1/0/all/0/1">Dmitry A. Duev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Feeney_M/0/1/0/all/0/1">Michael Feeney</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Frederick_S/0/1/0/all/0/1">Sara Frederick</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Graham_M/0/1/0/all/0/1">Matthew J. Graham</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Laher_R/0/1/0/all/0/1">Russ R. Laher</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Masci_F/0/1/0/all/0/1">Frank J. Masci</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kasliwal_M/0/1/0/all/0/1">Mansi M. Kasliwal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kowalski_M/0/1/0/all/0/1">Marek Kowalski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miller_A/0/1/0/all/0/1">Adam A. Miller</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rigault_M/0/1/0/all/0/1">Mickael Rigault</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rusholme_B/0/1/0/all/0/1">Ben Rusholme</a>

We present a survey of the early evolution of 12 Type IIn supernovae (SNe
IIn) in the Ultra-Violet (UV) and visible light. We use this survey to
constrain the geometry of the circumstellar material (CSM) surrounding SN IIn
explosions, which may shed light on their progenitor diversity. In order to
distinguish between aspherical and spherical circumstellar material (CSM), we
estimate the blackbody radius temporal evolution of the SNe IIn of our sample,
following the method introduced by Soumagnac et al. We find that higher
luminosity objects tend to show evidence for aspherical CSM. Depending on
whether this correlation is due to physical reasons or to some selection bias,
we derive a lower limit between 35% and 66% on the fraction of SNe IIn showing
evidence for aspherical CSM. This result suggests that asphericity of the CSM
surrounding SNe IIn is common – consistent with data from resolved images of
stars undergoing considerable mass loss. It should be taken into account for
more realistic modelling of these events.

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