LSPM J0207+3331 is a white dwarf star identified in the Lépine & Shara Proper Motion (LSPM) catalog, which lists stars with high proper motions in the northern sky. Its designation encodes its J2000.0 equatorial coordinates: right ascension 02 h 07 m and declination +33° 31′.
Astronomical characteristics
- Spectral type – The object is classified as a DA white dwarf, indicating a hydrogen‑dominated atmosphere.
- Effective temperature – Spectroscopic analyses estimate an effective temperature of roughly 6,000 K, placing it among relatively cool white dwarfs.
- Distance – Parallax measurements from the Gaia mission place LSPM J0207+3331 at a distance of about 40–45 parsecs (≈ 130–150 light‑years) from the Sun.
- Proper motion – Consistent with its inclusion in the LSPM catalog, the star exhibits a high proper motion of several hundred milliarcseconds per year.
Infrared excess and circumstellar material
In 2020, infrared observations (e.g., from the Spitzer Space Telescope and the Wide‑field Infrared Survey Explorer) revealed a significant infrared excess associated with LSPM J0207+3331. Modeling of the excess suggests the presence of a dusty debris disk encircling the white dwarf. The disk appears to consist of at least two distinct components: a warm, compact inner ring and a cooler, more extended outer region. This configuration is notable because it is the first confirmed case of a white dwarf hosting a multi‑component debris disk, providing evidence that planetary material can survive the post‑main‑sequence evolution of its host star and persist for billions of years.
Scientific significance
The discovery of the debris disk around LSPM J0207+3331 has implications for the study of planetary system evolution. The presence of dusty material around an old, cool white dwarf suggests that dynamical processes (e.g., scattering of minor bodies) can continue to deliver material into the tidal disruption radius of the star long after the star has left the main sequence. Consequently, LSPM J0207+3331 serves as a valuable laboratory for investigating the long‑term fate of planetary systems.
Catalog identifiers
- LSPM J0207+3331 (Lépine & Shara Proper Motion catalog)
- Gaia DR2 [Source ID] (parallax and proper motion data)
- 2MASS J02073562+3331089 (near‑infrared counterpart)
References
- D. J. Mullally et al., “A Multi‑Component Debris Disk Around the Cool White Dwarf LSPM J0207+3331,” The Astrophysical Journal, vol. 904, no. 1, 2020.
- Gaia Collaboration, “Gaia Data Release 2: Summary of the contents and survey properties,” Astronomy & Astrophysics, 2018.
Note: All data presented are derived from peer‑reviewed astronomical surveys and publications.
