Gaia17bpp
Gaia17bpp is a rare M-type Red giant star that exhibited a single large dimming event (G-16-20.5 mag) over 6.5 years. The variable star is located in the constellation of Sagitta roughly 27,600 ly (8.5 kpc).[1] Current hypothesis and archival data suggest that Gaia17bpp belongs to a rare family of ultra-long period binary stars where the companion is enshrouded in large optically thick disks reminiscent of Epsilon Aurigae, VVV-WIT-07, and AS Leonis Minoris.[1] The proposed secondary star and disk remain unconfirmed due to the copious amount of intervening interstellar dust, and likely due to the remarkable long timescale period of the system.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagitta |
| Right ascension | 19h 37m 23.16s |
| Declination | +17° 59′ 02.90″ |
| Characteristics | |
| Astrometry | |
| Parallax (π) | −0.18±0.4 mas. Derived distance using photogeometric distance posterior distribution (Bailer-Jones et al. 2021) |
| Other designations | |
| AT 2017exj 2MASS J19372316+1759029 | |
| Database references | |
| SIMBAD | J19372316+1759029 data |
Gaia17bpp[2] was initially discovered through the ESA's Gaia Photometric Science Alerts[3] (GPSA) in 2022 by astronomers at the University of Washington. The remarkable Gaia17bpp dimming event occurred in mid 2012, however the GPSA issued an alert back in 2017 when the star began brightening.
References
- ^ a b Tzanidakis, Anastasios; Davenport, James R. A.; Bellm, Eric C.; Wang, Yuankun (2023-09-01). "Gaia17bpp: A Giant Star with the Deepest and Longest Known Dimming Event". The Astrophysical Journal. 955 (1): 69. doi:10.3847/1538-4357/aceda7. ISSN 0004-637X.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ "Gaia17bpp". gsaweb.ast.cam.ac.uk. Retrieved 2024-01-08.
- ^ Hodgkin, S. T.; Harrison, D. L.; Breedt, E.; Wevers, T.; Rixon, G.; Delgado, A.; Yoldas, A.; Kostrzewa-Rutkowska, Z.; Wyrzykowski, Ł.; van Leeuwen, M.; Blagorodnova, N.; Campbell, H.; Eappachen, D.; Fraser, M.; Ihanec, N. (2021-08-01). "Gaia Early Data Release 3. Gaia photometric science alerts". Astronomy and Astrophysics. 652: A76. doi:10.1051/0004-6361/202140735. ISSN 0004-6361.