Identification of a Low-mass Companion to the White Dwarf SDSS J131730.84+483332.7
Abstract
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 ${80.2}_{-1.8}^{+0.5}$ MJup, near the substellar boundary.
- Publication:
-
Research Notes of the American Astronomical Society
- Pub Date:
- April 2021
- DOI:
- 10.3847/2515-5172/abf49a
- Bibcode:
- 2021RNAAS...5...76J
- Keywords:
-
- Substellar companion stars;
- Binary stars;
- 1648;
- 154