TY - JOUR
T1 - AT 2020nov
T2 - Evidence for Disk Reprocessing in a Rare Tidal Disruption Event
AU - Earl, Nicholas
AU - French, K. Decker
AU - Ramirez-Ruiz, Enrico
AU - Auchettl, Katie
AU - Raimundo, Sandra I.
AU - Davis, Kyle W.
AU - Masterson, Megan
AU - Arcavi, Iair
AU - Lu, Wenbin
AU - Baldassare, Vivienne F.
AU - Coulter, David A.
AU - de Boer, Thomas
AU - Drout, Maria R.
AU - Dykaar, Hannah
AU - Foley, Ryan J.
AU - Gall, Christa
AU - Gao, Hua
AU - Huber, Mark E.
AU - Jones, David O.
AU - Langeroodi, Danial
AU - Lin, Chien Cheng
AU - Magnier, Eugene A.
AU - Mockler, Brenna
AU - Shepherd, Margaret
AU - Verrico, Margaret E.
N1 - Publisher Copyright: © 2025. The Author(s). Published by the American Astronomical Society.
PY - 2025/4/10
Y1 - 2025/4/10
N2 - We present a detailed analysis of AT 2020nov, a tidal disruption event (TDE) in the center of its host galaxy, located at a redshift of z = 0.083. AT 2020nov exhibits unique features, including double-peaked Balmer emission lines, a broad UV/optical flare, and a peak log luminosity in the extreme-ultraviolet (EUV) estimated at ∼ 45.6 6 − 0.33 + 0.10 erg s − 1 . A late-time X-ray flare was also observed, reaching an absorbed luminosity of 1.67 × 1043 erg s−1 approximately 300 days after the UV/optical peak. Multiwavelength coverage, spanning optical, UV, X-ray, and mid-infrared (MIR) bands, reveals a complex spectral energy distribution (SED) that includes MIR flaring indicative of dust echoes, suggesting a dust covering fraction consistent with typical TDEs. Spectral modeling indicates the presence of an extended, quiescent disk around the central supermassive black hole with a radius of ∼ 5.0 6 − 0.77 + 0.59 × 1 0 4 R g . The multicomponent SED model, which includes a significant EUV component, suggests that the primary emission from the TDE is reprocessed by this extended disk, producing the observed optical and MIR features. The lack of strong active galactic nuclei signatures in the host galaxy, combined with the quiescent disk structure, highlights AT 2020nov as a rare example of a TDE occurring in a galaxy with a dormant but extended preexisting accretion structure.
AB - We present a detailed analysis of AT 2020nov, a tidal disruption event (TDE) in the center of its host galaxy, located at a redshift of z = 0.083. AT 2020nov exhibits unique features, including double-peaked Balmer emission lines, a broad UV/optical flare, and a peak log luminosity in the extreme-ultraviolet (EUV) estimated at ∼ 45.6 6 − 0.33 + 0.10 erg s − 1 . A late-time X-ray flare was also observed, reaching an absorbed luminosity of 1.67 × 1043 erg s−1 approximately 300 days after the UV/optical peak. Multiwavelength coverage, spanning optical, UV, X-ray, and mid-infrared (MIR) bands, reveals a complex spectral energy distribution (SED) that includes MIR flaring indicative of dust echoes, suggesting a dust covering fraction consistent with typical TDEs. Spectral modeling indicates the presence of an extended, quiescent disk around the central supermassive black hole with a radius of ∼ 5.0 6 − 0.77 + 0.59 × 1 0 4 R g . The multicomponent SED model, which includes a significant EUV component, suggests that the primary emission from the TDE is reprocessed by this extended disk, producing the observed optical and MIR features. The lack of strong active galactic nuclei signatures in the host galaxy, combined with the quiescent disk structure, highlights AT 2020nov as a rare example of a TDE occurring in a galaxy with a dormant but extended preexisting accretion structure.
UR - http://www.scopus.com/inward/record.url?scp=105002049825&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/adb974
DO - 10.3847/1538-4357/adb974
M3 - مقالة
SN - 0004-637X
VL - 983
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 28
ER -