arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0909.3780astro-ph.SR
收藏

附近窄线Ic型SN 2007 gr的广泛光学和近红外观测:第5天到第415天

Extensive optical and near-infrared observations of the nearby, narrow-lined type Ic SN 2007gr: days 5 to 415

Deborah J. Hunter, Stefano Valenti, Rubina Kotak, Peter Meikle, Stefan Taubenberger, Andrea Pastorello, Stefano Benetti, Vallery Stanishev, Steven J. Smartt, Ca… 展开作者

Deborah J. Hunter, Stefano Valenti, Rubina Kotak, Peter Meikle, Stefan Taubenberger, Andrea Pastorello, Stefano Benetti, Vallery Stanishev, Steven J. Smartt, Carrie Trundle, Arkady A. Arkharov, Milena Bufano, Enrico Cappellaro, Elisa Di Carlo, Mauro Dolci, Nancy Elias-Rosa, Soeren Frandsen, Johan U. Fynbo, Ulrich Hopp, Valeri M. Larionov, Peter Laursen, Paolo Mazzali, Hripsime Navasardyan, Christoph Ries, Arno Riffeser, Luca Rizzi, Dmitrii Y. Tsvetkov, Massimo Turatto, Silona Wilke

摘要:

我们目前的光度和光谱观测在光学和近红外波长的附近类型Ic SN 2007 gr。这些是迄今为止这一类型超新星最广泛的数据集,从发现后不久到爆炸后一年多的频繁覆盖。我们推断B波段最大值的上升时间为11.5 \pm-2.7天。我们发现B波段的峰值星等为M_B=-16.8,光变曲线与所谓的“超新星”SN 2002 ap非常相似。相比之下,SNe 2007 gr和2002 ap的光谱显示出明显的差异,尤其是在它们各自的膨胀速度上。我们将这些差异主要归因于它们的祖先恒星在爆炸时的密度分布,即SN 2007 gr比SN 2002 ap更紧凑。根据SN 2007 gr的准测辐射热光变曲线,我们估计在爆炸中产生了0.076 $\pm$ 0.010 Msun的56 Ni。我们的近红外(IR)光谱清楚地显示了一氧化碳(CO)的第一泛音相对于B带最大值在~70至175天之间的开始和消失。CO分子的检测意味着电离的He在碳/氧层内没有微观混合。从光学光谱,近红外光变曲线,和颜色的演变,我们发现没有证据尘埃凝结在喷出物了约400天。鉴于前所未有的时间覆盖范围和高信噪比数据的组合,我们建议SN 2007 gr可以用作这一子类超新星的模板对象。

英文摘要:

We present photometric and spectroscopic observations at optical and near-infrared wavelengths of the nearby type Ic SN 2007gr. These represent the most extensive data-set to date of any supernova of this sub-type, with frequent coverage from shortly after discovery to more than one year post-explosion. We deduce a rise time to B-band maximum of 11.5 \pm 2.7 days. We find a peak B-band magnitude of M_B=-16.8, and light curves which are remarkably similar to the so-called 'hypernova' SN 2002ap. In contrast, the spectra of SNe 2007gr and 2002ap show marked differences, not least in their respective expansion velocities. We attribute these differences primarily to the density profiles of their progenitor stars at the time of explosion i.e. a more compact star for SN 2007gr compared to SN 2002ap. From the quasi-bolometric light curve of SN 2007gr, we estimate that 0.076 $\pm$ 0.010 Msun of 56Ni was produced in the explosion. Our near-infrared (IR) spectra clearly show the onset and disappearance of the first overtone of carbon monoxide (CO) between ~70 to 175 days relative to B-band maximum. The detection of the CO molecule implies that ionised He was not microscopically mixed within the carbon/oxygen layers. From the optical spectra, near-IR light curves, and colour evolution, we find no evidence for dust condensation in the ejecta out to about 400 days. Given the combination of unprecedented temporal coverage, and high signal-to-noise data, we suggest that SN 2007gr could be used as a template object for supernovae of this sub-class.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑