Constraints on the Physical Properties of SNe Ia from Photometry

Abstract

We present a photometric study of 17 Type Ia supernovae (SNe) based on multi-color (Bessell BV R C I C ) data taken at Piszkéstető mountain station of Konkoly Observatory, Hungary between 2016 and 2018. We analyze the light curves (LCs) using the publicly available LC-fitter SNooPy2 to derive distance and reddening information. The bolometric LCs are fit with a radiation-diffusion Arnett-model to get constraints on the physical parameters of the ejecta: the optical opacity, the ejected mass and the expansion velocity in particular. We also study the pre-maximum (B − V ) color evolution by comparing our data with standard delayed detonation and pulsational delayed detonation models, and show that the 56 Ni masses of the models that fit the (B − V ) colors are consistent with those derived from the bolometric LC fitting. We find similar correlations between the ejecta parameters (e.g. ejecta mass, or 56 Ni mass vs decline rate) as published recently by Scalzo et al. (2019).

Nebular-phase spectra of Type Ia supernovae from the Las Cumbres Observatory Global Supernova Project

“…Brown et al (2019) provide an extensive analysis of the light curve shape and color, which we summarize as indicating a host-galaxy extinction of 𝐴 𝑉 ≈ 0.45 ± 0.05 mag. This, along with the host's distance modulus 𝜇 = 32.34±0.097 mag (Könyves-Tóth et al 2020), suggests a peak intrinsic magnitude of 𝐵 ≈ −19.5±0.15 mag. We note also that Könyves-Tóth et al ( 2020) report a synthesized 56 Ni mass of 0.975 ± 0.083 M , the highest in their sample of 17 SNe Ia.…”

Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star

“…This is the case for the nearby microlensing event TCPJ05074264+2447555 43 (hereafter Kojima-1 44 ), which was serendipitously discovered during a nova search conducted by an amateur astronomer, Mr. T.Kojima. On 2017 October 31 UT, he reported an unknown transient event on an R=13.6 mag star toward the Taurus constellation, 45 and later, the microlensing nature of this event was confirmed by photometric and spectroscopic follow-up observations (Jayasinghe et al 2017;Konyves-Toth et al 2017;Maehara 2017;Sokolovsky 2017). Moreover, a planetary feature was detected near the peak of the event by the earliest photometric follow-up observations (Nucita et al 2017).…”

Kutatásra oktatva: a Csillagászati és Földtudományi Kutatóközpont Csillagászati Intézete hallgatói mentorprogramjának első öt éve • Educated towards Research: The First Five Years of the Undergraduate Mentoring Programme at the Konkoly Observatory of the Research Centre for Astronomy and Earth Sciences

“…Kilenc hallgatótól tizenhét első szerzős publikációt találtunk a cikkek között, amelyek egy részét persze már doktori kutatómunka keretében készítették el. De legalább kilenc esetben igazolható, hogy mesterszakos hallgatóként vállalkoztak -megfelelő témavezetői irányítás mellett -szakcikk megírására (Bora et al, 2022;Csörnyei-Szabados, 2019;Seli et al, 2019;Könyves-Tóth et al, 2020;Krezinger et al, 2020;Kalup et al, 2021a,b;Szabó et al, 2021;Veres et al, 2021).…”