The Rise and Fall of ASASSN-18pg: Following a TDE from Early to Late Times
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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The Rise and Fall of ASASSN-18pg : Following a TDE from Early to Late Times. / Holoien, Thomas W. -S.; Auchettl, Katie; Tucker, Michael A.; Shappee, Benjamin J.; Patel, Shannon G.; Miller-Jones, James C. A.; Mockler, Brenna; Groenewald, Daniel N.; Hinkle, Jason T.; Brown, Jonathan S.; Kochanek, Christopher S.; Stanek, K. Z.; Chen, Ping; Dong, Subo; Prieto, Jose L.; Thompson, Todd A.; Beaton, Rachael L.; Connor, Thomas; Cowperthwaite, Philip S.; Dahmen, Linnea; French, K. Decker; Morrell, Nidia; Buckley, David A. H.; Gromadzki, Mariusz; Roy, Rupak; Coulter, David A.; Dimitriadis, Georgios; Foley, Ryan J.; Kilpatrick, Charles D.; Piro, Anthony L.; Rojas-Bravo, Cesar; Siebert, Matthew R.; Velzen, Sjoert van.
I: Astrophysical Journal, Bind 898, Nr. 2, 161, 01.08.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The Rise and Fall of ASASSN-18pg
T2 - Following a TDE from Early to Late Times
AU - Holoien, Thomas W. -S.
AU - Auchettl, Katie
AU - Tucker, Michael A.
AU - Shappee, Benjamin J.
AU - Patel, Shannon G.
AU - Miller-Jones, James C. A.
AU - Mockler, Brenna
AU - Groenewald, Daniel N.
AU - Hinkle, Jason T.
AU - Brown, Jonathan S.
AU - Kochanek, Christopher S.
AU - Stanek, K. Z.
AU - Chen, Ping
AU - Dong, Subo
AU - Prieto, Jose L.
AU - Thompson, Todd A.
AU - Beaton, Rachael L.
AU - Connor, Thomas
AU - Cowperthwaite, Philip S.
AU - Dahmen, Linnea
AU - French, K. Decker
AU - Morrell, Nidia
AU - Buckley, David A. H.
AU - Gromadzki, Mariusz
AU - Roy, Rupak
AU - Coulter, David A.
AU - Dimitriadis, Georgios
AU - Foley, Ryan J.
AU - Kilpatrick, Charles D.
AU - Piro, Anthony L.
AU - Rojas-Bravo, Cesar
AU - Siebert, Matthew R.
AU - Velzen, Sjoert van
PY - 2020/8/1
Y1 - 2020/8/1
N2 - We present nearly 500 days of observations of the tidal disruption event (TDE) ASASSN-18pg, spanning from 54 days before peak light to 441 days after peak light. Our data set includes X-ray, UV, and optical photometry, optical spectroscopy, radio observations, and the first published spectropolarimetric observations of a TDE. ASASSN-18pg was discovered on 2018 July 11 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance ofd = 78.6 Mpc; with a peak UV magnitude ofm 14, it is both one of the nearest and brightest TDEs discovered to-date. The photometric data allow us to track both the rise to peak and the long-term evolution of the TDE. ASASSN-18pg peaked at a luminosity ofL 2.4 x 10(44)erg s(-1), and its late-time evolution is shallower than a flux proportional to t(-5/3)power-law model, similar to what has been seen in other TDEs. ASASSN-18pg exhibited Balmer lines and spectroscopic features consistent with Bowen fluorescence prior to peak, which remained detectable for roughly 225 days after peak. Analysis of the two-component H alpha profile indicates that, if they are the result of reprocessing of emission from the accretion disk, the different spectroscopic lines may be coming from regions between similar to 10 and similar to 60 lt-days from the black hole. No X-ray emission is detected from the TDE, and there is no evidence of a jet or strong outflow detected in the radio. Our spectropolarimetric observations indicate that the projected emission region is likely not significantly aspherical, with the projected emission region having an axis ratio of greater than or similar to 0.65.
AB - We present nearly 500 days of observations of the tidal disruption event (TDE) ASASSN-18pg, spanning from 54 days before peak light to 441 days after peak light. Our data set includes X-ray, UV, and optical photometry, optical spectroscopy, radio observations, and the first published spectropolarimetric observations of a TDE. ASASSN-18pg was discovered on 2018 July 11 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance ofd = 78.6 Mpc; with a peak UV magnitude ofm 14, it is both one of the nearest and brightest TDEs discovered to-date. The photometric data allow us to track both the rise to peak and the long-term evolution of the TDE. ASASSN-18pg peaked at a luminosity ofL 2.4 x 10(44)erg s(-1), and its late-time evolution is shallower than a flux proportional to t(-5/3)power-law model, similar to what has been seen in other TDEs. ASASSN-18pg exhibited Balmer lines and spectroscopic features consistent with Bowen fluorescence prior to peak, which remained detectable for roughly 225 days after peak. Analysis of the two-component H alpha profile indicates that, if they are the result of reprocessing of emission from the accretion disk, the different spectroscopic lines may be coming from regions between similar to 10 and similar to 60 lt-days from the black hole. No X-ray emission is detected from the TDE, and there is no evidence of a jet or strong outflow detected in the radio. Our spectropolarimetric observations indicate that the projected emission region is likely not significantly aspherical, with the projected emission region having an axis ratio of greater than or similar to 0.65.
KW - Black holes
KW - Accretion
KW - Galaxy accretion disks
KW - Black hole physics
KW - Supermassive black holes
KW - Tidal disruption
KW - TIDAL DISRUPTION EVENT
KW - STARS
KW - SPECTROGRAPH
KW - TELESCOPE
KW - EVOLUTION
KW - MASSES
KW - FLARE
KW - POLARIZATION
KW - CALIBRATION
KW - RESOLUTION
U2 - 10.3847/1538-4357/ab9f3d
DO - 10.3847/1538-4357/ab9f3d
M3 - Journal article
VL - 898
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 161
ER -
ID: 247873449