Unofficial PetaPixel BotImages of Ultra-Rare Cosmic Calamity Unravel a Longstanding Mystery https://petapixel.com/2025/12/16/images-of-ultra-rare-cosmic-calamity-unravel-a-longstanding-mystery/ #blackhole #telescope #noirlab #science #Space #lfbot #space #News #star
Daniel FischerThe Most Luminous Known Fast Blue Optical Transient AT 2024wpp - Unprecedented Evolution and Properties in the Ultraviolet to the Near-Infrared / in the X-rays and Radio: https://arxiv.org/abs/2509.00951 / https://arxiv.org/abs/2509.00952 -> Scientists have found over a dozen luminous blue outbursts — including one called the Cow — that were thought to be unusual supernovae. A new outburst, the brightest yet, suggests otherwise: https://news.berkeley.edu/2025/12/16/whats-powering-these-mysterious-bright-blue-cosmic-flashes-astronomers-find-a-clue/ #LFBOT
The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the Ultraviolet to the Near-Infrared
We present an extensive photometric and spectroscopic ultraviolet-optical-infrared campaign on the luminous fast blue optical transient (LFBOT) AT 2024wpp over the first ~100 d. AT 2024wpp is the most luminous LFBOT discovered to date, with $L_{\rm{pk}}\approx(2-4)\times10^{45}$ erg s$^{-1}$ (5-10 times that of the prototypical AT 2018cow). This extreme luminosity enabled the acquisition of the most detailed LFBOT UV light curve thus far. In the first ~45 d, AT 2024wpp radiated $>10^{51}$ erg, surpassing AT 2018cow by an order of magnitude and requiring a power source beyond the radioactive $^{56}$Ni decay of traditional supernovae. Like AT 2018cow, the UV-optical spectrum of AT 2024wpp is dominated by a persistently blue thermal continuum throughout our monitoring, with blackbody parameters at peak of T>30,000 K and $R_{\rm{BB}}/t\approx0.2-0.3c$. A temperature of $\gtrsim$20,000 K is maintained thereafter without evidence for cooling. We interpret the featureless spectra as a consequence of continuous energy injection from a central source of high-energy emission which maintains high ejecta ionization. After 35 d, faint (equivalent width <10 Å) H and He spectral features with kinematically separate velocity components centered at 0 km s$^{-1}$ and -6400 km s$^{-1}$ emerge, implying spherical symmetry deviations. A near-infrared excess of emission above the optical blackbody emerges between 20-30 d with a power-law spectrum $F_{\rmν,NIR}\proptoν^{-0.3}$ at 30 d. We interpret this distinct emission component as either reprocessing of early UV emission in a dust echo or free-free emission in an extended medium above the optical photosphere. LFBOT asphericity and multiple outflow components (including mildly relativistic ejecta) together with the large radiated energy are naturally realized by super-Eddington accretion disks around neutron stars or black holes and their outflows.
Ca Se Passe Là-HautIl y a un un peu plus d'un mois (épisode 1557), je vous relatais la découverte d'un sursaut de lumière de type LFBOT (Luminous Fast Blue Optical Transient) qui est atypique car esseulé loin de sa galaxie. Aujourd'hui, un autre LFBOT encore plus atypique vient d'être découvert par Anna Ho et al. : celui-là produit des flashs à répétition... L'étude vient de paraître dans Nature.
à lire : https://www.ca-se-passe-la-haut.fr/2023/11/decouverte-dun-lfbot-qui-se-repete-une.html
à écouter : https://casepasselahaut.lepodcast.fr/numero-1574-decouverte-dun-lfbot-qui-se-repete-une-premiere
#astrophysique #science #LFBOT #podcast
Bernd Sonneck 🌞#Hubble Sees a Mysterious #Flash in Between #Galaxies
https://www.universetoday.com/163555/hubble-sees-a-mysterious-flash-in-between-galaxies/
Kuuke's SterrenbeeldenLFBOT “de Vink” waargenomen op een onverwachte plek
Luminous Fast Blue Optical Transients (LFBOT’s) zijn een zeldzame klasse van gebeurtenissen waarvan de oorsprong slecht wordt begrepen. Het prototypische voorbeeld van LFBOT’s is AT2018cow
https://www.kuuke.nl/lfbot-de-vink-waargenomen-op-een-onverwachte-plek/
#AT2018cow #AT2023fhn #DeKoe #DeVink #LFBOT #LuminousFastBlueOpticalTransients
Massimo LucianiAn article being published in the journal "Monthly Notices of the Royal Astronomical Society" reports the observation of a Luminous Fast Blue Optical Transient (LFBOT), a rare type of cosmic explosion of still uncertain nature which was cataloged as AT2023fhn.