Photometric evolution of seven recent novae and the double-component characterizing the light curve of those emitting in gamma rays
Photometric evolution of seven recent novae and the double-component characterizing the light curve of those emitting in gamma rays
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最近七颗新星的光度演化以及描述发射伽马射线的光变曲线的双分量
DOI：
10.1093/mnras/stx1116
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发表时间：
2017
影响因子：
4.8
通讯作者：
A. Frigo
中科院分区：
文献类型：
--
作者：
U. Munari;F. Hambsch;A. Frigo
来自智利阿塔卡马的机器人每日观测绘制了7颗新星的英属维尔京群岛光曲线。它们是V1534Sco、V1535Sco、V2949Oph、V3661Oph、主OTJ010603.18-744715.8、TCPJ1734475-240942和ASASSN-16 ma。其中五颗属于凸起，一颗属于SMC，另一颗属于银河盘天体。费米-LAT在伽马射线中探测到的两个程序新星(TCPJ1734475-240942和ASASSN-16 ma)是带有未演化伴星的凸起天体。它们的独特之处在于显示了一条双分量光学光线曲线。第一个要开发的部件是由自由膨胀的弹道发射的喷射物产生的火球，其通过极大值的时间强烈依赖于波长(B和I波段之间的~1天延迟)。第二个分量与伽马射线中的新星探测同时出现，演化速度较慢，其光学亮度与伽马射线流量成正比，其通过最大值与波长无关。伽马射线的探测峰值通量水平与新星相差4倍，这一事实似乎表明，伽马射线发射并不是正常新星的普遍属性。我们讨论了只用一个望远镜收集的高质量光度观测提供的优势(而不是由许多不同的仪器提供的数据)，并观察到以下效果：火球膨胀的波长依赖性，巨型伴星闪光风中的复合，微妙的打嗝的存在，超软X射线发射的开关。四颗程序新星(V2949Oph、V3661Oph、TCPJ18102829-2729590和ASASSN-16 ma)被发现有正常的矮星伴星，而V1534Sco包含一个M3III巨星，V1535Sco是K型巨星，而OTJ010603.18-744715.8是亚巨星。
The BVI lightcurves of seven recent novae have been extensively mapped with daily robotic observations from Atacama (Chile). They are V1534 Sco, V1535 Sco, V2949 Oph, V3661 Oph, MASTER OT J010603.18-744715.8, TCP J1734475-240942 and ASASSN-16ma. Five belong to the Bulge, one to SMC and another is a Galactic disk object. The two program novae detected in gamma-rays by Fermi-LAT (TCP J1734475-240942 and ASASSN-16ma) are Bulge objects with unevolved companions. They distinguish themselves in showing a double-component optical lightcurve. The first component to develop is the fireball from freely-expanding, ballistic-launched ejecta with the time of passage through maximum which is strongly dependent on wavelength (~1 day delay between B and I bands). The second component, emerging simultaneously with the nova detection in gamma-rays, evolves at a slower pace, its optical brightness being proportional to the gamma-ray flux, and its passage through maximum not dependent on wavelength. The fact that gamma-rays are detected at peak flux level differing by 4x from novae at the distance of the Bulge seems to suggest that gamma-ray emission is not a widespread property of normal novae. We discuss the advantages offered by high-quality photometric observations collected with only one telescope (as opposed to data provided by a number of different instruments), and observe the effects of: wavelength dependence of a fireball expansion, recombination in the flashed wind of a giant companion, subtle presence of hiccups, super-soft X-ray emission on and off. Four program novae (V2949 Oph, V3661 Oph, TCP J18102829-2729590, and ASASSN-16ma) are found to have normal dwarf companions, while V1534 Sco contains an M3III giant, V1535 Sco a K-type giant, and MASTER OT J010603.18-744715.8 a sub-giant.