Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit

被引：2

作者：

Burgasser, Adam J. ^{[1
]}

Gerasimov, Roman ^{[2
]}

Kremer, Kyle ^{[3
]}

Brooks, Hunter ^{[4
]}

Alvarado, Efrain ^{[5
]}

Schneider, Adam C. ^{[6
]}

Meisner, Aaron M. ^{[7
]}

Theissen, Christopher A. ^{[1
]}

Softich, Emma ^{[1
]}

Karpoor, Preethi ^{[1
]}

Bickle, Thomas P. ^{[8
,9
]}

Kabatnik, Martin ^{[9
]}

Rothermich, Austin ^{[10
,11
,12
]}

Caselden, Dan ^{[10
]}

Kirkpatrick, J. Davy ^{[13
]}

Faherty, Jacqueline K. ^{[10
]}

Casewell, Sarah L. ^{[14
]}

Kuchner, Marc J. ^{[15
]}

机构：

[1] Univ Calif San Diego, Dept Astron & Astrophys, La Jolla, CA 92093 USA

[2] Univ Notre Dame, Dept Phys & Astron, Notre Dame, IN 46556 USA

[3] CALTECH, TAPIR, Pasadena, CA 91125 USA

[4] No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 USA

[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[6] US Naval Observ, Flagstaff Stn, Flagstaff, AZ USA

[7] NSF Natl Opt Infrared Astron Res Lab, 950 North Cherry Ave, Tucson, AZ 85719 USA

[8] Open Univ, Sch Phys Sci, Milton Keynes MK7 6AA, England

[9] Backyard Worlds Planet, Tucson, AZ USA

[10] Amer Museum Nat Hist, Dept Astrophys, Cent Pk West & 79th St, New York, NY 10024 USA

[11] CUNY, Grad Ctr, Dept Phys, 365 5th Ave, New York, NY 10016 USA

[12] CUNY, Hunter Coll, Dept Phys & Astron, 695 Pk Ave, New York, NY 10065 USA

[13] Caltech, IPAC, Mail Code 100-22,,1200 East Calif Blvd, Pasadena, CA 91125 USA

[14] Univ Leicester, Ctr Exoplanet Res, Sch Phys & Astron, Univ Rd, Leicester LE1 7RH, England

[15] NASA, Exoplanets & Stellar Astrophys Lab, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 971卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

GALACTIC-CENTER; GAIA DR2; BROWN DWARFS; MILKY-WAY; SUBSTELLAR SUBDWARF; STAR CANDIDATES; PROPER MOTIONS; VELOCITY STARS; COOL STARS; CLUSTERS;

D O I：

10.3847/2041-8213/ad6607

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a high-velocity, very low-mass star or brown dwarf whose kinematics suggest it is unbound to the Milky Way. CWISE J124909.08+362116.0 was identified by citizen scientists in the Backyard Worlds: Planet 9 program as a high-proper-motion (mu = 0.'' 9 yr-1) faint red source. Moderate-resolution spectroscopy with Keck/NIRES reveals it to be a metal-poor early L subdwarf with a large radial velocity (-103 +/- 10 km s-1), and its estimated distance of 125 +/- 8 pc yields a speed of 456 +/- 27 km s-1 in the Galactic rest frame, near the local escape velocity for the Milky Way. We explore several potential scenarios for the origin of this source, including ejection from the Galactic center greater than or similar to 3 Gyr in the past, survival as the mass donor companion to an exploded white dwarf, acceleration through a three-body interaction with a black hole binary in a globular cluster, and accretion from a Milky Way satellite system. CWISE J1249+3621 is the first hypervelocity very low-mass star or brown dwarf to be found and the nearest of all such systems. It may represent a broader population of very high-velocity, low-mass objects that have undergone extreme accelerations.

引用

页数：8

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