Four New Eclipsing Mid M-dwarf Systems from the New Luyten Two Tenths Catalog
Abstract
Using data from the MEarth-North and MEarth-South transit surveys, we present the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP 796-24, and LP 991-15. Combining the MEarth photometry with spectroscopic follow-up observations, we show that LP 107-25 and LP 796-24 are short-period (1.388 and 0.523 day, respectively) eclipsing binaries in triple-lined systems with substantial third-light contamination from distant companions. LP 261-75 is a short-period (1.882 day) single-lined system consisting of a mid M-dwarf eclipsed by a probable brown dwarf secondary, with another distant visual brown dwarf companion. LP 991-15 is a long-period (29.3 day) double-lined eclipsing binary on an eccentric orbit with a geometry that produces only primary eclipses. A spectroscopic orbit is given for LP 991-15, and initial orbits for LP 107-25 and LP 261-75.
- Publication:
-
The Astronomical Journal
- Pub Date:
- October 2018
- DOI:
- 10.3847/1538-3881/aad9a3
- arXiv:
- arXiv:1808.03243
- Bibcode:
- 2018AJ....156..140I
- Keywords:
-
- binaries: eclipsing;
- brown dwarfs;
- stars: low-mass;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 17 pages, 9 figures, 8 tables, emulateapj format. Accepted for publication in AJ