Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS

Holoien, T. W. S.; Vallely, P.; Auchettl, Katie; Stanek, K. Z.; Kochanek, C. S.; French, K. Decker; Prieto, J. L.; Shappee, B. J.; Brown, J. S.; Fausnaugh, Michael; Dong, Subo; Thompson, Todd A.; Bose, S.; Neustadt, Jack M. M.; Cacella, P.; Brimacombe, J.; Kendurkar, M.; Beaton, Rachael L.; Boutsia, K.; Chomiuk, Laura; Connor, Thomas; Morrell, N.; Newman, Andrew B.; Rudie, Gwen C.; Shishkovksy, Laura; Strader, Jay

doi:10.3847/1538-4357/ab3c66

Cited by 109 publications

(83 citation statements)

References 106 publications

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“…This is larger than the accreted mass estimates of most TDEs over similar timescales (Holoien et al 2019a;van Velzen et al 2019b). Recent TDEs studies have also shown that a significant amount of energy is radiated prior to peak brightness (Holoien et al 2019a;Leloudas et al 2019;Holoien et al 2019b), meaning that a significant amount of energy was probably radiated prior to our first detection.…”

Section: Sed Analysismentioning

confidence: 62%

“…When we remove the roughly linear decay seen in the light curve, the RMS variability in Swift UVW 2, UVM 2, UVW 1, U , and B bands is 0.15, 0.14, 0.12, 0.12 and 0.13 mag, respectively, all of which are larger than the median errors of 0.5, 0.5, 0.5, 0.7, and 0.12 mag, respectively. This is unusual for TDEs, which generally show fairly smooth declines (Holoien et al 2019b). For example, the light curve of ASASSN-19bt had RMS variability of only ∼0.01 mag.…”

Section: Sed Analysismentioning

confidence: 92%

“…By comparison, most TDEs with well-sampled UV/optical light curves show only smooth, monotonic fading. Some recently discovered TDEs have shown deviations from monotonic fading: ASASSN-18ul showed a light curve plateau ∼40 d after peak brightness (Wevers et al 2019b) and ASASSN-19bt showed a short flare before reaching peak brightness (Holoien et al 2019b). In a more extreme example, PS18kh showed a UV re-brightening ∼50 d after peak (Holoien et al 2019a) and then, after a seasonal gap due Sun constraints, appeared to return to near-peak luminosity (van Velzen et al 2019a).…”

Section: Asassn-18jd As a Tdementioning

confidence: 99%

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To TDE or not to TDE: the luminous transient ASASSN-18jd with TDE-like and AGN-like qualities

Neustadt

Holoien

Kochanek

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present the discovery of ASASSN-18jd (AT 2018bcb), a luminous optical/UV/Xray transient located in the nucleus of the galaxy 2MASX J22434289-1659083 at z = 0.1192. Swift UVOT photometry shows the UV SED of the transient to be well modeled by a slowly shrinking blackbody with temperature T ∼ 2.5 × 10 4 K, a maximum observed luminosity of L max = 4.5 +0.6 −0.3 ×10 44 erg s −1 , and a total radiated energy of E = 9.6 +1.1 −0.6 × 10 51 erg. X-ray data from Swift XRT and XMM-Newton show a transient, variable X-ray flux with blackbody and power-law components. Optical spectra show strong, roughly constant broad Balmer emission as well as transient features attributable to He ii, N iii-v, O iii, and coronal Fe. While ASASSN-18jd shares similarities with Tidal Disruption Events (TDEs), it is also similar to the "rapid turn-on" events seen in quiescent galaxies and in faint Active Galactic Nuclei (AGNs).

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Section: Sed Analysismentioning

confidence: 62%

Section: Sed Analysismentioning

confidence: 92%

Section: Asassn-18jd As a Tdementioning

confidence: 99%

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To TDE or not to TDE: the luminous transient ASASSN-18jd with TDE-like and AGN-like qualities

Neustadt

Holoien

Kochanek

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…For the same object in the RND model, the radial velocity v r is not zero on the Schwarzschild radius, and the object can be swallowed by a black hole in finite time. In 2019, NASA's Transiting Exoplanet Survey Satellite (TESS) captured a rare cosmic event-a black hole swallowing a star roughly the size of our sun [30]. This event is easier to explain in the RND model.…”

Section: Distinctions Between Rn D and Gr Dynamicsmentioning

confidence: 99%

Relativistic Gravitation Based on Symmetry

Friedman

2020

Symmetry

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We present a Relativistic Newtonian Dynamics ( R N D ) for motion of objects in a gravitational field generated by a moving source. As in General Relativity ( G R ), we assume that objects move by a geodesic with respect to some metric, which is defined by the field. This metric is defined on flat lab spacetime and is derived using only symmetry, the fact that the field propagates with the speed of light, and the Newtonian limit. For a field of a single source, the influenced direction of the field at spacetime point x is defined as the direction from x to the to the position of the source at the retarded time. The metric depends only on this direction and the strength of the field at x. We show that for a static source, the R N D metric is of the same form as the Whitehead metric, and the Schwarzschild metric in Eddington–Finkelstein coordinates. Motion predicted under this model passes all classical tests of G R . Moreover, in this model, the total time for a round trip of light is as predicted by G R , but velocities of light and object and time dilation differ from the G R predictions. For example, light rays propagating toward the massive object do not slow down. The new time dilation prediction could be observed by measuring the relativistic redshift for stars near a black hole and for sungrazing comets. Terrestrial experiments to test speed of light predictions and the relativistic redshift are proposed. The R N D model is similar to Whitehead’s gravitation model for a static field, but its proposed extension to the non-static case is different. This extension uses a complex four-potential description of fields propagating with the speed of light.

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“…In recent years, thanks to the development of high-cadence optical and UV surveys, a number of TDEs have been found as optical and UV transients on time scales of months to years (Gezari et al 2006(Gezari et al , 2008(Gezari et al , 2012Holoien et al 2014;Hung et al 2017;van Velzen et al 2019;Holoien et al 2019; see van Velzen 2018 for a recent compilation). The optical and UV SED can normally be fitted with blackbody radiation at temperatures ∼ (1-3) × 10 4 K (van Velzen 2018).…”

Section: Introductionmentioning

confidence: 99%

Multiwavelength Study of an X-Ray Tidal Disruption Event Candidate in NGC 5092

Saxton

Yuan

et al. 2020

ApJ

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We present multiwavelength studies of a transient X-ray source, XMMSL1 J131952.3+225958, associated with the galaxy NGC 5092 at z = 0.023 detected in the XMM-Newton SLew survey (XMMSL). The source brightened in the 0.2-2 keV band by a factor of > 20 in 2005 as compared with previous flux limits and then faded by a factor of > 200 as observed with XMM-Newton in 2013 and with Swift in 2018. At the flaring state, the X-ray spectrum can be modeled with a blackbody at a temperature of ∼ 60 eV and an overall luminosity of ∼ 1.5 × 10 43 erg s −1 . A UV flare and optical flare were also detected with the Galaxy Evolution Explorer and the Sloan Digital Sky Survey, respectively, within several months of the X-ray flare, whose nonstellar UVoptical spectrum can be described with a blackbody at a temperature of ∼ (1 − 2) × 10 4 K and a luminosity of ∼ (2 − 6) × 10 43 erg s −1 . Interestingly, mid-infrared monitoring observations of NGC 5092 with the Wide-field Infrared Survey Explorer 5-13 yr later show a continuous flux decline. These dramatic variability properties, from the X-ray through UV and optical to infrared, appear to be orderly, suggestive of a stellar tidal disruption event (TDE) by a massive black hole, confirming the postulation by Kanner et al. (2013). This TDE candidate belongs to a rare sample with contemporaneous bright emission detected in the X-ray, UV, and optical, which are later echoed by dust-reprocessed light in the mid-infrared. The black hole has a mass of ∼ 5 × 10 7 M , residing in a galaxy that is dominated by a middle-aged stellar population of 2.5 Gyr.

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Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS

Cited by 109 publications

References 106 publications

To TDE or not to TDE: the luminous transient ASASSN-18jd with TDE-like and AGN-like qualities

To TDE or not to TDE: the luminous transient ASASSN-18jd with TDE-like and AGN-like qualities

Relativistic Gravitation Based on Symmetry

Multiwavelength Study of an X-Ray Tidal Disruption Event Candidate in NGC 5092

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