SALT spectroscopic classification of Gaia22bpl/AT2022hsp as microlensing event
ATel #15648; Zielinski P. (Institute of Astronomy, Nicolaus Copernicus University in Torun), Gromadzki M., Wyrzykowski L., (Astronomical Observatory, University of Warsaw), Buckley D. (South African Astronomical Observatory)
on 8 Oct 2022; 14:01 UT
Credential Certification: Pawel Zielinski (pzielinski.astro@gmail.com)
Subjects: Optical, Microlensing Event, Transient
We report on SALT spectroscopic observations of Gaia22bpl (AT2022hsp, aka Bohdan Paczynski Lens) transient detected by the Gaia Science Alerts program (http://gsaweb.ast.cam.ac.uk/alerts) on 2022-04-14 with an alerting magnitude G=12.15. High-resolution (R~15000) SALT/HRS spectrum was obtained on 2022-04-24, under the SALT Large Programme on transients (2021-2-LSP-001, PI: D. Buckley). Based on synthetic spectra fitting we classified this target as a red giant of K1 III spectral type. Absorption lines analysis and no visible emissions confirm this is a microlensing event. The part of the spectrum (around Ca II triplet region) is available on IAU's Transient Name Server under this link: https://www.wis-tns.org/object/2022hsp.
Acknowledgments: Polish participation in SALT is funded by grant No. MEiN nr 2021/WK/01. This project has received funding from the EU Horizon 2020 research and innovation programme under grant agreement No. No 101004719, as well as Polish NCN DAINA grant 2017/27/L/ST9/03221. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).
