YSES 2b是一颗背景恒星

IF 5.8 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astronomy & Astrophysics Pub Date : 2025-09-09 DOI:10.1051/0004-6361/202556170

Matthew Kenworthy, Tomas Stolker, Jens Kammerer, William Balmer, Arthur Vigan, Sylvestre Lacour, Gilles Otten, Eric Mamajek, Christian Ginski, Mathias Nowak, Steven Martos, Jason Wang, Emily Rickman, Markus Janson, Alexander Bohn, Mariangela Bonavita

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引用次数: 0

摘要

目标。我们希望确认YSES 2b的性质，据称它是年轻恒星YSES 2的暗淡伴星。我们使用来自SPHERE和GRAVITY的天空观测来测量2b相对于恒星YSES 2的天体测量位置，并检验了(i)绑定的次恒星伴星与（ii）具有非零固有运动的遥远无关背景源的相互竞争的假设。YSES 2b似乎是一颗晚型m矮星，距离恒星YSES 2超过2千秒差距。它的横向速度为~ 300 km s - 1，位于银河系的一个旋臂内。主要的区别是重力天体测量的多个时代，确定了亚毫弧秒的恒星平行运动。

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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YSES 2b is a background star

Aims. We wish to confirm the nature of YSES 2b, a purportedly faint companion of the young star YSES 2.Methods. We used on-sky observations from SPHERE and GRAVITY to measure the astrometric position of 2b with respect to the star YSES 2, and examined the competing hypotheses of (i) a bound substellar companion versus (ii) a distant unrelated background source with a non-zero proper motion.Results. YSES 2b appears to be a late-type M-dwarf star over 2 kiloparsecs behind the star YSES 2. It has a transverse velocity of ∼300 km s^{−1^{and is located within one of the spiral arms of the Galaxy. The main discriminant was multiple epochs of GRAVITY astrometry that identified the sub-milliarcsecond parallactic motion of the star.}}

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来源期刊

Astronomy & Astrophysics 地学天文-天文与天体物理

CiteScore
10.20

自引率
27.70%

发文量
2105

审稿时长
1-2 weeks

期刊介绍： Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.

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