Identification of a Low-mass Companion to the White Dwarf SDSS J131730.84+483332.7,Research Notes of the AAS

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Identification of a Low-mass Companion to the White Dwarf SDSS J131730.84+483332.7
Research Notes of the AAS Pub Date : 2021-04-08 , DOI: 10.3847/2515-5172/abf49a
Peter A. Jalowiczor ₁ , Sarah Casewell ₂ , Adam C. Schneider _{3,

4} , Jonathan Gagn _{5,

6} , Jacqueline K. Faherty ₇ , Marc J. Kuchner ₈ , Aaron M. Meisner ₉ , Adam J. Burgasser ₁₀

Affiliation

Backyard Worlds: Planet 9
Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK
United States Naval Observatory, Flagstaff Station, 10391 West Naval Observatory Rd., Flagstaff, AZ 86005, USA
Department of Physics and Astronomy, George Mason University, MS3F3, 4400 University Drive, Fairfax, VA 22030, USA
Plantarium Rio Tinto Alcan, Espace pour la Vie, 4801 ave. Pierre-de Coubertin, Montral, QC H1V 3V4, Canada
Institute for Research on Exoplanets, Universit de Montral, 2900 Boulevard douard-Montpetit Montral, QC H3T 1J4, Canada
Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, NY 10024, USA
Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
NSF’s National Optical-Infrared Astronomy Research Laboratory, 950 N. Cherry Ave., Tucson, AZ 85719, USA
Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093-0424, USA

We present the discovery of 2MASS J13173072+4833343, a low-mass stellar companion to the ∼5.5 Gyr old white dwarf SDSS J131730.85+483332.8. This companion was discovered through the Backyard Worlds: Planet 9 citizen science collaboration. We obtained a near-infrared spectrum of the companion and determined a spectral type of M8.5. Using the cooling age of the white dwarf, we determined that the stellar companion has a mass of ${0.077}_{-0.017}^{+0.005}$ M _☉, or ${80.2}_{-1.8}^{+0.5}$ M _Jup, near the substellar boundary.

中文翻译：

白矮星SDSS J131730.84+483332.7的低质量伴星的识别

我们提出了 2MASS J13173072+4833343 的发现，它是 ∼5.5 Gyr 老白矮星 SDSS J131730.85+483332.8 的低质量伴星。这个同伴是通过后院世界：第 9 行星公民科学合作发现的。我们获得了伴星的近红外光谱，并确定了 M8.5 的光谱类型。使用白矮星的冷却年龄，我们确定恒星伴星的质量为 ${0.077}_{-0.017}^{+0.005}$ M _☉，或 ${80.2}_{-1.8}^{+0.5}$ M _Jup，靠近亚恒星边界。

更新日期：2021-04-08

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