FIRST FINDINGS ON COMETARY ACTIVITY FROM THE PTF COMET SAMPLE

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-09-01 DOI:10.22201/ia.14052059p.2021.53.28

N. Mouawad, J. Fraine, J. Chebly, J. Bauer, R. Laher, M. Kelley, D. Bodewits

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Abstract

We present preliminary results from the Palomar Transient Factory (PTF) uniform sample of short period comets (SPCs) and long period comets (LPCs), captured between September 2009 and March 2013. We study their dynamical and physical properties in relation to their activity for a better understanding of cometary evolution. This observing campaign was part of PTF in its intermediate phase (iPTF) at the California Institute of Technology (Caltech). The photometric sample comprises more than 180 comets, which makes it one of the largest samples studied to-date. We present a new approach to identifying active comets that compares subtracted aperture magnitudes of comets with the distribution of stars of similar brightness in each image. In this paper, we present initial findings on cometary activity in relationship to their perihelion distances. We show differences between the distributions of the SPCs and that of the LPCs. As others predicted, it seems that a larger fraction of LPCs are found to be active at larger perihelia than for the SPCs. We look at ratios of active comets in different perihelia brackets and compare those to previous works and results. We do not discuss the statistical significance of our findings as this is still work in progress.

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首次发现来自PTF彗星样本的彗星活动

本文介绍了2009年9月至2013年3月间，由帕洛马瞬变工厂(PTF)采集的短周期彗星(spc)和长周期彗星(LPCs)均匀样本的初步结果。为了更好地理解彗星的演化，我们研究了它们与活动相关的动力学和物理性质。这次观测活动是加州理工学院(Caltech) PTF中期阶段(iPTF)的一部分。光度测量样本包括180多颗彗星，这使它成为迄今为止研究过的最大样本之一。我们提出了一种识别活动彗星的新方法，该方法将彗星的减去孔径星等与每张图像中相似亮度的恒星分布进行比较。在本文中，我们提出了彗星活动与近日点距离关系的初步发现。我们展示了spc和lpc分布之间的差异。正如其他人所预测的那样，在较大的近日点上发现的lpc的活跃比例似乎比SPCs的活跃比例要大。我们观察不同近日点括号内活跃彗星的比例，并将其与之前的工作和结果进行比较。我们不讨论我们的发现的统计意义，因为这仍在进行中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Mexicana de Astronomia y Astrofisica 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Revista Mexicana de Astronomía y Astrofísica, founded in 1974, publishes original research papers in all branches of astronomy, astrophysics and closely related fields. Two numbers per year are issued and are distributed free of charge to all institutions engaged in the fields covered by the RMxAA.