An environmental analysis of the Type Ib SN 2019yvr and the possible presence of an inflated binary companion
| Autor: | Ning-Chen Sun, Justyn R Maund, Paul A Crowther, Ryosuke Hirai, Amir Kashapov, Ji-Feng Liu, Liang-Duan Liu, Emmanouil Zapartas |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 510:3701-3715 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | SN 2019yvr is the second Type Ib supernova (SN) with a possible direct detection of its progenitor (system); however, the spectral energy distribution (SED) of the pre-explosion source appears much cooler and overluminous than an expected helium-star progenitor. Using Hubble Space Telescope (HST) images and MUSE integral-field-unit (IFU) spectroscopy, we find the SN environment contains three episodes of star formation; the low ejecta mass suggests the SN progenitor is most likely from the oldest population, corresponding to an initial mass of 10.4$^{+1.5}_{-1.3}$ $M_\odot$. The pre-explosion SED can be reproduced by two components, one for the hot and compact SN progenitor and one for a cool and inflated yellow hypergiant (YHG) companion that dominates the brightness. Thus, SN 2019yvr could possibly be the first Type Ib/c SN for which the progenitor's binary companion is directly detected on pre-explosion images. Both the low progenitor mass and the YHG companion suggest significant binary interaction during their evolution. Similar to SN 2014C, SN 2019yvr exhibits a metamorphosis from Type Ib to Type IIn, showing signatures of interaction with hydrogen-rich circumstellar material (CSM) at >150 days; our result supports enhanced pre-SN mass loss as an important process for hydrogen-poor stars at the low mass end of core-collapse SN progenitors. 15 pages, 9 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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