SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2)
Abstract
We present the 30-min cadence Kepler/K2 light curve of the Type Ia supernova (SN Ia) SN 2018agk, covering approximately one week before explosion, the full rise phase and the decline until 40 days after peak. We additionally present ground-based observations in multiple bands within the same time range, including the 1-day cadence DECam observations within the first 5 days after the first light. The Kepler early light curve is fully consistent with a single power-law rise, without evidence of any bump feature. We compare SN 2018agk with a sample of other SNe~Ia without early excess flux from the literature. We find that SNe Ia without excess flux have slowly-evolving early colors in a narrow range ( mag) within the first days. On the other hand, among SNe Ia detected with excess, SN 2017cbv and SN 2018oh tend to be bluer, while iPTF16abc's evolution is similar to normal SNe Ia without excess in . We further compare the Kepler light curve of SN 2018agk with companion-interaction models, and rule out the existence of a typical non-degenerate companion undergoing Roche-lobe overflow at viewing angles smaller than .
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Cite
@article{arxiv.2108.13607,
title = {SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2)},
author = {Qinan Wang and Armin Rest and Yossef Zenati and Ryan Ridden-Harper and Georgios Dimitriadis and Gautham Narayan and V. Ashley Villar and Mark R. Magee and Ryan J. Foley and Edward J. Shaya and Peter Garnavich and Lifan Wang and Lei Hu and Attila Bodi and Patrick Armstrong and Katie Auchettl and Thomas Barclay and Geert Barentsen and Zsófia Bognár and Joseph Brimacombe and Joanna Bulger and Jamison Burke and Peter Challis and Kenneth Chambers and David A. Coulter and Géza Csörnyei and Borbála Cseh and Maxime Deckers and Jessie L. Dotson and Lluís Galbany and Santiago González-Gaitán and Mariusz Gromadzki and Michael Gully-Santiago and Ottó Hanyecz and Christina Hedges and Daichi Hiramatsu and Griffin Hosseinzadeh and D. Andrew Howell and Steve B. Howell and Mark E. Huber and Saurabh W. Jha and David O. Jones and Réka Könyves-Tóth and Csilla Kalup and Charlie Kilpatrick and Levente Kriskovics and Wenxiong Li and Thomas B Lowe and Steven Margheim and Curtis McCully and Ayan Mitra and Jose A. Muñoz and Matt Nicholl and Jakob Nordin and András Pál and Yen-Chen Pan and Anthony L Piro and Sofia Rest and João Rino-Silvestre and César Rojas-Bravo and Krisztián Sárneczky and Matthew R. Siebert and Stephen J. Smartt and Ken Smith and Ádám Sódor and Maximilian D. Stritzinger and Róbert Szabó and Róbert Szakáts and Brad E. Tucker and József Vinkó and Xiaofeng Wang and J. Craig Wheeler and David R. Young and Alfredo Zenteno and Kaicheng Zhang and Gabriella Zsidi},
journal= {arXiv preprint arXiv:2108.13607},
year = {2021}
}
Comments
20 pages, 14 figures, 5 tables. Published in ApJ