Academic Journal
Seeing Double:ASASSN-18bt Exhibits a two-component Rise in the Early-Time K2 Light Curve
| العنوان: | Seeing Double:ASASSN-18bt Exhibits a two-component Rise in the Early-Time K2 Light Curve |
|---|---|
| المؤلفون: | Shappee, B. J., Holoien, T. W. -s., Drout, M. R., Auchettl, K., Stritzinger, M. D., Kochanek, C. S., Stanek, K. Z., Shaya, E., Narayan, G., Brown, J. S., Bose, S., Bersier, D., Brimacombe, J., Chen, Ping, Dong, Subo, Holmbo, S., Katz, B., Munnoz, J. A., Mutel, R. L., Post, R. S., Prieto, J. L., Shields, J., Tallon, D., Thompson, T. A., Vallely, P. J., Jr, S. Villanueva, Denneau, L., Flewelling, H., Heinze, A. N., Smith, K. W., Stalder, B., Tonry, J. L., Weiland, H., Barclay, T., Barentsen, G., Cody, A. M., Dotson, J., Foerster, F., Garnavich, P., Gully-santiago, M., Hedges, C., Howell, S., Kasen, D., Margheim, S., Mushotzky, R., Rest, A., Tucker, B. E., Villar, A., Zenteno, A., Beerman, G., Bjella, R., Castillo, G., Coughlin, J., Elsaesser, B., Flynn, S., Gangopadhyay, R., Griest, K., Hanley, M., Kampmeier, J., Kloetzel, R., Kohnert, L., Labonde, C., Larsen, R., Larson, K. A., Mccalmont-everton, K. M., Mcginn, C., Migliorini, L., Moffatt, J., Muszynski, M., Nystrom, V., Osborne, D., Packard, M., Peterson, C. A., Redick, M., Reedy, L. H., Spencer, B., Steward, K., Cleve, J. E. Van, Cardoso, J. Vinicius De Miranda, Weschler, T., Wheaton, A., Bulger, J., Lowe, T. B., Magnier, E. A., Waters, C. Z., Willman, M., Baron, Eddie, Chen, Zhihao, Derkacy, James M., Huang, Fang, Li, Linyi, Li, Wenxiong, Li, Xue, Rui, Liming, Sai, Hanna, Wang, Lifan, Wang, Lingzhi, Wang, Xiaofeng, Xiang, Danfeng, Zhang, Jicheng, Zhang, Jujia, Zhang, Kaicheng, Zhang, Tianmeng, Zhang, Xinghan, Zhao, Xulin, Brown, P. J., Hermes, J. J., Nordin, J., Points, S., Strampelli, G. M. |
| المصدر: | Shappee , B J , Holoien , T W , Drout , M R , Auchettl , K , Stritzinger , M D , Kochanek , C S , Stanek , K Z , Shaya , E , Narayan , G , Brown , J S , Bose , S , Bersier , D , Brimacombe , J , Chen , P , Dong , S , Holmbo , S , Katz , B , Munnoz , J A , Mutel , R L , Post , R S , Prieto , J L , Shields , J , .... |
| سنة النشر: | 2019 |
| المجموعة: | Aarhus University: Research |
| مصطلحات موضوعية: | astro-ph.HE |
| الوصف: | On 2018 Feb. 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in the K2 Campaign 16 field. With a redshift of $z=0.010981$ and a peak apparent magnitude of $B_{max}=14.31$, ASASSN-18bt is the nearest and brightest SNe Ia yet observed by the Kepler spacecraft. Here we present the discovery of ASASSN-18bt, the K2 light curve, and pre-discovery data from ASAS-SN and the Asteroid Terrestrial-impact Last Alert System (ATLAS). The K2 early-time light curve has an unprecedented cadence and photometric precision for an SN Ia light curve, and it unambiguously shows a 4 day nearly linear phase followed by a steeper rise. Thus, ASASSN-18bt joins a growing list of SNe Ia whose early light curves are not well described by a single power law. We show that a double-power-law model fits the data reasonably well, hinting that two physical processes must be responsible for the observed rise. However, we find that current models of the interaction with a non-degenerate companion predict an abrupt rise and cannot adequately explain the initial, slower linear phase. Instead, we find that existing, published models with shallow $^{56}$Ni are able to span the observed behavior and, with tuning, may be able to reproduce the ASASSN-18bt light curve. Regardless, more theoretical work is needed to satisfactorily model this and other early-time SNe~Ia light curves. Finally, we use Swift X-ray non-detections to constrain the presence of CSM at much larger distances and lower densities than possible with the optical light curve. Assuming a wind-like environment, the observed X-ray limit corresponds to a mass-loss limit of $\dot M |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | https://pure.au.dk/portal/en/publications/e0723921-98d9-43ec-840b-e21dbb4fb772 |
| الاتاحة: | https://pure.au.dk/portal/en/publications/e0723921-98d9-43ec-840b-e21dbb4fb772 https://pure.au.dk/ws/files/130527941/1807.11526v1.pdf |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.2CEB3D56 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |