DRAFT
2024-06-15 14:41:43
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN.157....1K
Spectroscopy of the Transient AT 2024lby: likely a Galactic Transient
Abstract:
We report spectroscopic follow-up observation of AT 2024lby (ZTF24aarvbxj). Our spectrum shows narrow absorption lines of Balmer, Na ID, and Ca II H & K at the Milky-Way Rest frame. AT 2024lby is likely a Galactic source, not hosted by LEDA 162310 (z ~ 0.02).
We obtained a spectrum of AT 2024lby using the Gemini Multi-Object Spectrograph on Gemini North at 2024-06-14 10:25:40 UTC. Hα, Hβ, Na ID, and Ca II H & K are detected in narrow absorption at the Milky-Way rest frame, not at the rest frame of the putative hot galaxy (z ~ 0.02, LEDA 162310). It indicates that AT 2024lby is likely a Galactic source. No emission lines are found in our spectrum. We also note that there is a bright source (8.596 Vega mag) in WISE W4 (WISE All-Sky Data Release; Cutri et al. 2012) near the position of AT 2024lby, offset from the W1 and W2 source images that are centered on LEDA 162310. AT 2024lby may be hosted by a mid-IR-bright progenitor (a Galactic YSO as a potential progenitor).
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2024lby | 20:22:40.784 | -08:10:41.95 | 20:22:40.786 | -08:10:41.84 | SN II | 0.02 |