English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Transient fading X-ray emission detected during the optical rise of a tidal disruption event

MPS-Authors
/persons/resource/persons242079

Malyali,  A.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4632

Rau,  A.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons79621

Liu,  Z.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4724

Merloni,  A.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons287988

Grotova,  I.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Malyali, A., Rau, A., Bonnerot, C., Goodwin, A. J., Liu, Z., Anderson, G. E., et al. (2024). Transient fading X-ray emission detected during the optical rise of a tidal disruption event. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 531(1), 1256-1275. doi:10.1093/mnras/stae927.


Cite as: https://hdl.handle.net/21.11116/0000-0010-3369-F
Abstract
We report on the SRG/eROSITA detection of ultra-soft kT=47(-5)(+5)eVX-ray emission (LX=2.5(-0.5)(+0.6)x10(43)ergs(-1)) from the tidal disruption event (TDE) candidate AT 2022dsb similar to 14 d before peak optical brightness. As the optical luminosity increases after the eROSITA detection, then the 0.2-2 keV observed flux decays, decreasing by a factor of similar to 39 over the 19 d after the initial X-ray detection. Multi-epoch optical spectroscopic follow-up observations reveal transient broad Balmer emission lines and a broad He ii 4686 & Aring; emission complex with respect to the pre-outburst spectrum. Despite the early drop in the observed X-ray flux, the He ii 4686 & Aring; complex is still detected for similar to 40 d after the optical peak, suggesting the persistence of an obscured hard ionizing source in the system. Three outflow signatures are also detected at early times: (i) blueshifted H alpha emission lines in a pre-peak optical spectrum, (ii) transient radio emission, and (iii) blueshifted Ly alpha absorption lines. The joint evolution of this early-time X-ray emission, the He ii 4686 & Aring; complex, and these outflow signatures suggests that the X-ray emitting disc (formed promptly in this TDE) is still present after optical peak, but may have been enshrouded by optically thick debris, leading to the X-ray faintness in the months after the disruption. If the observed early-time properties in this TDE are not unique to this system, then other TDEs may also be X-ray bright at early times and become X-ray faint upon being veiled by debris launched shortly after the onset of circularization.