Type II supernova SN 2020jfo investigated in detail

A world crew of researchers have carried out high-cadence photometric and spectroscopic observations of a Sort II supernova often known as SN 2020jfo. Outcomes of the observational marketing campaign, offered November 5 on arXiv.org, ship essential insights into the character and properties of this supernova.

Sort II supernovae (SNe) are the outcomes of speedy collapse and violent explosion of large stars (with lots above 8.0 solar masses). They’re distinguished from different SNe by the presence of hydrogen of their spectra. Primarily based on the form of their mild curves, they’re often divided into Sort IIL and Sort IIP. Sort IIL SNe present a gentle (linear) decline after the explosion, whereas Sort IIP exhibit a interval of slower decline (a plateau) that’s adopted by a standard decay.

SN 2020jfo (often known as ZTF20aaynrrh) was detected with the Palomar Schmidt 48-inch Samuel Oschin telescope on Could 6, 2020, as a part of the Zwicky Transient Facility (ZTF) survey. It exploded within the outskirts of the face-on spiral galaxy M61, positioned some 47.3 million light years away. SN 2020jfo was labeled as a Sort II SN based mostly on spectra from the Liverpool Telescope (LT) and the Nordic Optical Telescope (NOT), acquired 17 hours after the detection.

With the intention to shed extra mild on the character of SN 2020jfo, a gaggle of astronomers led by Bhavya Ailawadhi of the Aryabhatta Analysis Institute of Observational Sciences in India, commenced a high-cadence photometric and spectroscopic observations of this SN in ultraviolet, optical and near-infrared bands, three days after the explosion. For this function, they used NASA’s Swift spacecraft and a set of assorted ground-based observing amenities worldwide.

“We current high-cadence photometric and spectroscopic observations of SN 2020jfo in ultraviolet and optical/near-infrared bands ranging from ∼ 3 to ∼ 434 days after the explosion, together with the earliest information with the ten.4 m GTC [Gran Telescopio Canarias],” the researchers wrote within the paper.

The observations discovered that the plateau phase after the explosion was comparatively quick because it lasted roughly 67 days. It was famous that in contrast to different SNe II with shorter plateau length, SN 2020jfo is fainter, with a peak absolute V-band magnitude of −16.90 magazine.

The outcomes point out that regardless of the shorter plateau length in SN 2020jfo, the impartial atomic hydrogen (HI) absorption options in its plateau-phase spectra are remarkably robust, suggesting a comparatively excessive hydrogen-envelope mass. Furthermore, the spectra of SN 2020jfo present robust steel traces in comparison with different SNe II at related epochs and with comparable plateau lengths.

In line with the researchers, the progenitor mass of SN 2020jfo is most probably between 12 and 15 solar lots, whereas its ejecta mass, at a stage of 13.6 solar lots, turned out to be a lot increased than that of the Sort II SNe. All in all, the authors of the examine concluded that though SN 2020jfo has a brief plateau size, its parameters are extra just like these of regular SNe IIP.

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