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Title: The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution

Abstract

We present multiwavelength observations of the tidal disruption event (TDE) iPTF15af, discovered by the intermediate Palomar Transient Factory survey at redshift z = 0.07897. The optical and ultraviolet (UV) light curves of the transient show a slow decay over 5 months, in agreement with previous optically discovered TDEs. It also has a comparable blackbody peak luminosity of $${L}_{\mathrm{peak}}\approx 1.5\times {10}^{44}$$ $$\mathrm{erg}\,{{\rm{s}}}^{-1}$$. The inferred temperature from the optical and UV data shows a value of (3–5) × 104 K. The transient is not detected in X-rays up to $${L}_{{\rm{X}}}\lt 3\times {10}^{42}$$ $$\mathrm{erg}\,{{\rm{s}}}^{-1}$$ within the first 5 months after discovery. The optical spectra exhibit two distinct broad emission lines in the He ii region, and at later times also Hα emission. Additionally, emission from [N iii] and [O iii] is detected, likely produced by the Bowen fluorescence effect. UV spectra reveal broad emission and absorption lines associated with high-ionization states of N v, C iv, Si iv, and possibly P v. These features, analogous to those of broad absorption line quasars (BAL QSOs), require an absorber with column densities $${N}_{{\rm{H}}}\gt {10}^{23}$$ cm –2. Here, this optically thick gas would also explain the nondetection in soft X-rays. The profile of the absorption lines with the highest column density material at the largest velocity is opposite that of BAL QSOs. We suggest that radiation pressure generated by the TDE flare at early times could have provided the initial acceleration mechanism for this gas. Spectral UV line monitoring of future TDEs could test this proposal.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [3];  [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [3]; ORCiD logo [10];  [11]; ORCiD logo [12];  [3];  [3];  [5]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States); Radboud Univ., Nijmegen (The Netherlands)
  2. Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  4. Univ. of California, Santa Barbara, CA (United States); Las Cumbres Observatory, Goleta, CA (United States); Univ. of California, Berkeley, CA (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. The Hebrew Univ. of Jerusalem, Jerusalem (Israel)
  7. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  8. Stockholm Univ., Stockholm (Sweden)
  9. Univ. of Warwick, Coventry (United Kingdom)
  10. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  11. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  12. Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1526587
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Volume: 873; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; accretion; accretion disks; black hole physics; galaxies: nuclei; stars: individual (iPTF15af)

Citation Formats

Blagorodnova, N., Cenko, S. B., Kulkarni, S. R., Arcavi, I., Bloom, J. S., Duggan, G., Filippenko, A. V., Fremling, C., Horesh, A., Hosseinzadeh, G., Karamehmetoglu, E., Levan, A., Masci, F. J., Nugent, P. E., Pasham, D. R., Veilleux, S., Walters, R., Yan, L., and Zheng, W. The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab04b0.
Blagorodnova, N., Cenko, S. B., Kulkarni, S. R., Arcavi, I., Bloom, J. S., Duggan, G., Filippenko, A. V., Fremling, C., Horesh, A., Hosseinzadeh, G., Karamehmetoglu, E., Levan, A., Masci, F. J., Nugent, P. E., Pasham, D. R., Veilleux, S., Walters, R., Yan, L., & Zheng, W. The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution. United States. doi:10.3847/1538-4357/ab04b0.
Blagorodnova, N., Cenko, S. B., Kulkarni, S. R., Arcavi, I., Bloom, J. S., Duggan, G., Filippenko, A. V., Fremling, C., Horesh, A., Hosseinzadeh, G., Karamehmetoglu, E., Levan, A., Masci, F. J., Nugent, P. E., Pasham, D. R., Veilleux, S., Walters, R., Yan, L., and Zheng, W. Fri . "The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution". United States. doi:10.3847/1538-4357/ab04b0.
@article{osti_1526587,
title = {The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution},
author = {Blagorodnova, N. and Cenko, S. B. and Kulkarni, S. R. and Arcavi, I. and Bloom, J. S. and Duggan, G. and Filippenko, A. V. and Fremling, C. and Horesh, A. and Hosseinzadeh, G. and Karamehmetoglu, E. and Levan, A. and Masci, F. J. and Nugent, P. E. and Pasham, D. R. and Veilleux, S. and Walters, R. and Yan, L. and Zheng, W.},
abstractNote = {We present multiwavelength observations of the tidal disruption event (TDE) iPTF15af, discovered by the intermediate Palomar Transient Factory survey at redshift z = 0.07897. The optical and ultraviolet (UV) light curves of the transient show a slow decay over 5 months, in agreement with previous optically discovered TDEs. It also has a comparable blackbody peak luminosity of ${L}_{\mathrm{peak}}\approx 1.5\times {10}^{44}$ $\mathrm{erg}\,{{\rm{s}}}^{-1}$. The inferred temperature from the optical and UV data shows a value of (3–5) × 104 K. The transient is not detected in X-rays up to ${L}_{{\rm{X}}}\lt 3\times {10}^{42}$ $\mathrm{erg}\,{{\rm{s}}}^{-1}$ within the first 5 months after discovery. The optical spectra exhibit two distinct broad emission lines in the He ii region, and at later times also Hα emission. Additionally, emission from [N iii] and [O iii] is detected, likely produced by the Bowen fluorescence effect. UV spectra reveal broad emission and absorption lines associated with high-ionization states of N v, C iv, Si iv, and possibly P v. These features, analogous to those of broad absorption line quasars (BAL QSOs), require an absorber with column densities ${N}_{{\rm{H}}}\gt {10}^{23}$ cm–2. Here, this optically thick gas would also explain the nondetection in soft X-rays. The profile of the absorption lines with the highest column density material at the largest velocity is opposite that of BAL QSOs. We suggest that radiation pressure generated by the TDE flare at early times could have provided the initial acceleration mechanism for this gas. Spectral UV line monitoring of future TDEs could test this proposal.},
doi = {10.3847/1538-4357/ab04b0},
journal = {The Astrophysical Journal (Online)},
issn = {1538-4357},
number = 1,
volume = 873,
place = {United States},
year = {2019},
month = {3}
}

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  • Monthly Notices of the Royal Astronomical Society, Vol. 474, Issue 3
  • DOI: 10.1093/mnras/stx2928

Tidal disruption of stars by black holes of 106–108 solar masses in nearby galaxies
journal, June 1988