An Extremely Massive White Dwarf Escaped from the Hyades Star Cluster

IF 8.8 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astrophysical Journal Letters Pub Date : 2023-10-01 DOI:10.3847/2041-8213/acffc4

David R. Miller, Ilaria Caiazzo, Jeremy Heyl, Harvey B. Richer, Kareem El-Badry, Antonio C. Rodriguez, Zachary P. Vanderbosch, Jan van Roestel

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Abstract

Abstract We searched the Gaia DR3 database for ultramassive white dwarfs with kinematics consistent with having escaped the nearby Hyades open cluster, identifying three such candidates. Two of these candidates have masses estimated from Gaia photometry of approximately 1.1 solar masses; their status as products of single-stellar evolution that have escaped the cluster was deemed too questionable for immediate follow-up analysis. The remaining candidate has an expected mass >1.3 solar masses, significantly reducing the probability of it being an interloper. Analysis of follow-up Gemini GMOS spectroscopy for this source reveals a nonmagnetized hydrogen atmosphere white dwarf with a mass and age consistent with having formed from a single star. Assuming a single-stellar-evolution formation channel, we estimate a 97.8% chance that the candidate is a true escapee from the Hyades. With a determined mass of 1.317 solar masses, this is potentially the most massive known single-evolution white dwarf and is by far the most massive with a strong association with an open cluster.

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一颗巨大的白矮星逃离了毕宿星团

我们在盖亚DR3数据库中搜索了与逃离附近毕宿星团一致的超大质量白矮星，确定了三个这样的候选者。其中两个候选者的质量根据盖亚光度法估计约为1.1个太阳质量;它们作为逃离星团的单恒星演化产物的地位被认为过于可疑，无法立即进行后续分析。剩下的候选者的预期质量为1.3个太阳质量，这大大降低了它成为闯入者的可能性。对该源的后续双子座GMOS光谱分析揭示了一颗非磁化氢大气白矮星，其质量和年龄与由单一恒星形成的一致。假设是单星演化形成通道，我们估计有97.8%的可能性候选恒星是真正逃离毕宿星团的。这颗已知质量为1.317个太阳质量的白矮星，可能是已知最大的单进化白矮星，也是迄今为止与疏散星团密切相关的最大质量白矮星。

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

Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-

CiteScore

14.10

自引率

6.30%

发文量

513

审稿时长

2-3 weeks

期刊介绍： The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.