K2对SN 2018oh的观测揭示Ia型超新星的双分量上升光变曲线
高能天体物理现象
2019-01-09 v1
摘要
我们呈现了Ia型超新星（SN Ia）2018oh（ASASSN-18bt）的极高精度、30分钟 cadence 的 Kepler（K2）光变曲线，其始于爆炸前数周，覆盖爆炸时刻及随后的上升阶段，并延续至峰值亮度之后。这些数据由爆炸后数小时内获得的 Pan-STARRS1 多色观测与 CTIO 4-m DECam 观测补充。K2光变曲线具有不寻常的双分量形状：流量在前几天以陡峭线性梯度上升，随后如典型SNe Ia那样呈二次上升。这一相对于标准SN Ia行为的“流量超出”在我们的 波段光变曲线中得到确认，而且SN 2018oh在早期历元尤其蓝。流量超出在爆炸后 2.14 天达到峰值，FWHM为 3.12 天，黑体温度 K，峰值光度 ，总积分能量 。我们将SN 2018oh与几种可能在早期提供额外加热的模型比较，包括与伴星碰撞以及放射性镍的浅浓度分布。尽管这些模型总体上均能重现早期K2光变曲线形状，基于我们的早期颜色测量，我们略微倾向于伴星相互作用，距离为 ，尽管确切距离取决于不确定的视角。对未来SN 2018oh建模与观测中伴星相互作用的进一步确认，将为单简并前身星系统提供有力支持。
引用
@article{arxiv.1811.10061,
title = {K2 Observations of SN 2018oh Reveal a Two-Component Rising Light Curve for a Type Ia Supernova},
author = {G. Dimitriadis and R. J. Foley and A. Rest and D. Kasen and A. L. Piro and A. Polin and D. O. Jones and A. Villar and G. Narayan and D. A. Coulter and C. D. Kilpatrick and Y. -C. Pan and C. Rojas-Bravo and O. D. Fox and S. W. Jha and P. E. Nugent and A. G. Riess and D. Scolnic and M. R. Drout and G. Barentsen and J. Dotson and M. Gully-Santiago and C. Hedges and A. M. Cody and T. Barclay and S. Howell and P. Garnavich and B. E. Tucker and E. Shaya and R. Mushotzky and R. P. Olling and S. Margheim and A. Zenteno and J. Coughlin and J. E. Van Cleve and J. Vinicius de Miranda Cardoso and K. A. Larson and K. M. McCalmont-Everton and C. A. Peterson and S. E. Ross and L. H. Reedy and D. Osborne and C. McGinn and L. Kohnert and L. Migliorini and A. Wheaton and B. Spencer and C. Labonde and G. Castillo and G. Beerman and K. Steward and M. Hanley and R. Larsen and R. Gangopadhyay and R. Kloetzel and T. Weschler and V. Nystrom and J. Moffatt and M. Redick and K. Griest and M. Packard and M. Muszynski and J. Kampmeier and R. Bjella and S. Flynn and B. Elsaesser and K. C. Chambers and H. A. Flewelling and M. E. Huber and E. A. Magnier and C. Z. Waters and A. S. B. Schultz and J. Bulger and T. B. Lowe and M. Willman and S. J. Smartt and K. W. Smith and S. Points and G. M. Strampelli and J. Brimacombe and P. Chen and J. A. Munoz and R. L. Mutel and J. Shields and P. J. Vallely and S. Villanueva and W. Li and X. Wang and J. Zhang and H. Lin and J. Mo and X. Zhao and H. Sai and X. Zhang and K. Zhang and T. Zhang and L. Wang and J. Zhang and E. Baron and J. M. DerKacy and L. Li and Z. Chen and D. Xiang and L. Rui and L. Wang and F. Huang and X. Li and G. Hosseinzadeh and D. A. Howell and I. Arcavi and D. Hiramatsu and J. Burke and S. Valenti and J. L. Tonry and L. Denneau and A. N. Heinze and H. Weiland and B. Stalder and J. Vinko and K. Sarneczky and A. Pa and A. Bodi and Zs. Bognar and B. Csak and B. Cseh and G. Csornyei and O. Hanyecz and B. Ignacz and Cs. Kalup and R. Konyves-Toth and L. Kriskovics and A. Ordasi and I. Rajmon and A. Sodor and R. Szabo and R. Szakats and G. Zsidi and S. C. Williams and J. Nordin and R. Cartier and C. Frohmaier and L. Galbany and C. P. Gutierrez and I. Hook and C. Inserra and M. Smith and D. J. Sand and J. E. Andrews and N. Smith and C. Bilinski},
journal= {arXiv preprint arXiv:1811.10061},
year = {2019}
}
备注
20 pages, 9 figures, 2 tables. Submitted to APJ Letters on 31 Jul 2018, Accepted for publication on 31 Aug 2018