Wang, Qinan and Rest, Armin and Zenati, Yossef and Ridden-Harper, Ryan and Dimitriadis, Georgios and Narayan, Gautham and Villar, V. Ashley and Magee, Mark R. and Foley, Ryan J. and Shaya, Edward J. and Garnavich, Peter and Wang, Lifan and Hu, Lei and Bódi, Attila and Armstrong, Patrick and Auchettl, Katie and Barclay, Thomas and Barentsen, Geert and Bognár, Zsófia and Brimacombe, Joseph and Bulger, Joanna and Burke, Jamison and Challis, Peter and Chambers, Kenneth and Coulter, David A. and Csörnyei, Géza and Cseh, Borbála and Deckers, Maxime and Dotson, Jessie L. and Galbany, Lluís and González-Gaitán, Santiago and Gromadzki, Mariusz and Gully-Santiago, Michael and Hanyecz, Ottó and Hedges, Christina and Hiramatsu, Daichi and Hosseinzadeh, Griffin and Howell, D. Andrew and Howell, Steve B. and Huber, Mark E. and Jha, Saurabh W. and Jones, David O. and Könyves-Tóth, Réka and Kalup, Csilla and Kilpatrick, Charles D. and Kriskovics, Levente and Li, Wenxiong and Lowe, Thomas B and Margheim, Steven and McCully, Curtis and Mitra, Ayan and Muñoz, Jose A. and Nicholl, Matt and Nordin, Jakob and Pál, András and Pan, Yen-Chen and Piro, Anthony L. and Rest, Sofia and Rino-Silvestre, João and Rojas-Bravo, César and Sárneczky, Krisztián and Siebert, Matthew R. and Smartt, Stephen J. and Smith, Ken and Sódor, Ádám and Stritzinger, Maximilian D. and Szabó, Róbert and Szakáts, Róbert and Tucker, Brad E. and Vinkó, József and Wang, Xiaofeng and Wheeler, J. Craig and Young, David R. and Zenteno, Alfredo and Zhang, KaiCheng and Zsidi, Gabriella (2021) SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2). The Astrophysical Journal, 923 (2): 167. ISSN 0004-637X
Full text not available from this repository.Abstract
We present the 30 minutes 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 (g − i ≈ −0.20 ± 0.20 mag) within the first ∼10 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 g − i. We further compare the Kepler light curve of SN 2018agk with companion-interaction models, and rule out the existence of a typical nondegenerate companion undergoing Roche lobe overflow at viewing angles smaller than 45°.