An Automated Catalog of Long Period Variables using Infrared Lightcurves from Palomar Gattini-IR

IF 3.3 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of the Pacific Pub Date : 2024-08-20 DOI:10.1088/1538-3873/ad68a4

Aswin Suresh, Viraj Karambelkar, Mansi M. Kasliwal, Michael C. B. Ashley, Kishalay De, Matthew J. Hankins, Anna M. Moore, Jamie Soon, Roberto Soria, Tony Travouillon, Kayton K. Truong

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Abstract

Long Period Variables (LPVs) are stars with periods of several hundred days, representing the late, dust-enshrouded phase of stellar evolution in low to intermediate mass stars. In this paper, we present a catalog of 154,755 LPVs using near-IR lightcurves from the Palomar Gattini-IR (PGIR) survey. PGIR has been surveying the entire accessible northern sky (δ > −28°) in the J-band at a cadence of 2–3 days since 2018 September, and has produced J-band lightcurves for more than 60 million sources. We used a gradient-boosted decision tree classifier trained on a comprehensive feature set extracted from PGIR lightcurves to search for LPVs in this data set. We developed a parallelized and optimized code to extract features at a rate of ∼0.1 s per lightcurve. Our model can successfully distinguish LPVs from other stars with a true positive rate of 95%. Cross-matching with known LPVs, we find 70,369 (∼46%) new LPVs in our catalog.

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利用帕洛玛-加蒂尼-红外光谱的红外光曲线自动编制长周期变星表

长周期变星（LPVs）是指周期长达几百天的恒星，代表了中低质量恒星演化后期的尘埃笼罩阶段。本文利用 Palomar Gattini-IR（PGIR）巡天观测的近红外光曲线，给出了一份包含 154755 个 LPV 的星表。自2018年9月以来，PGIR一直以2-3天一次的频率在J波段对整个可进入的北部天空（δ >-28°）进行巡天，目前已经产生了6000多万个源的J波段光曲线。我们使用梯度提升决策树分类器，在从 PGIR 光曲线提取的综合特征集上进行训练，以搜索该数据集中的 LPV。我们开发了一套并行化的优化代码，以每条光曲线 ∼ 0.1 秒的速度提取特征。我们的模型可以成功地将 LPV 与其他恒星区分开来，真阳性率高达 95%。通过与已知 LPV 的交叉匹配，我们在星表中发现了 70,369 个（46%）新的 LPV。

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

Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理

CiteScore

6.70

自引率

5.70%

发文量

103

审稿时长

4-8 weeks

期刊介绍： The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.

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