The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl
Abstract
In this work, we present the ultraviolet (UV) spectroscopic evolution of a tidal disruption event (TDE) for the first time. After the discovery of the nearby TDE iPTF16fnl, we obtained a series of observations with the Space Telescope Imaging Spectrograph (STIS) onboard the HubbleSpaceTelescope (HST). The dominant emission features closely resemble those seen in the UV spectra of the TDE ASASSN-14li and are also similar to those of N-rich quasars. There is evolution in the shape and central wavelength of the dominant emission features over the course of our observations, such that at early times the lines tend to be broad and redshifted, while at later times they are narrower and peak near the wavelengths of their atomic transitions. Like ASASSN-14li, but unlike N-rich quasars, iPTF16fnl shows neither Mg II 2798 Å nor C III] 1909 Å emission features. We also present optical photometry and spectroscopy, which suggest that the complex He II profiles observed in the optical spectra of many TDEs are in part due to the presence of N III and C III Wolf–Rayet features, which can potentially serve as probes of the far-UV when space-based observations are not possible. Finally, we use Swift X-ray Telescope and Ultraviolet/Opticalmore »
- Authors:
-
- The Ohio State Univ., Columbus, OH (United States)
- Carnegie Observatories, Pasadena, CA (United States)
- Universidad Diego Portales, Santiago (Chile)
- Carnegie Observatories, La Serena (Chile)
- Harvard–Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Michigan State Univ., East Lansing, MI (United States)
- Post Observatory, Lexington, MA (United States)
- Peking Univ., Beijing (China)
- Publication Date:
- Research Org.:
- The Krell Institute, Inc., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1512965
- Grant/Contract Number:
- FG02-97ER25308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 473; Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; accretion; accretion discs; black hole physics; galaxies: nuclei
Citation Formats
Brown, J. S., Kochanek, C. S., Holoien, T. W. -S., Stanek, K. Z., Auchettl, K., Shappee, B. J., Prieto, J. L., Morrell, N., Falco, E., Strader, J., Chomiuk, L., Post, R., Villanueva, S., Mathur, S., Dong, S., Chen, P., and Bose, S. The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl. United States: N. p., 2017.
Web. doi:10.1093/mnras/stx2372.
Brown, J. S., Kochanek, C. S., Holoien, T. W. -S., Stanek, K. Z., Auchettl, K., Shappee, B. J., Prieto, J. L., Morrell, N., Falco, E., Strader, J., Chomiuk, L., Post, R., Villanueva, S., Mathur, S., Dong, S., Chen, P., & Bose, S. The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl. United States. https://doi.org/10.1093/mnras/stx2372
Brown, J. S., Kochanek, C. S., Holoien, T. W. -S., Stanek, K. Z., Auchettl, K., Shappee, B. J., Prieto, J. L., Morrell, N., Falco, E., Strader, J., Chomiuk, L., Post, R., Villanueva, S., Mathur, S., Dong, S., Chen, P., and Bose, S. Fri .
"The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl". United States. https://doi.org/10.1093/mnras/stx2372. https://www.osti.gov/servlets/purl/1512965.
@article{osti_1512965,
title = {The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl},
author = {Brown, J. S. and Kochanek, C. S. and Holoien, T. W. -S. and Stanek, K. Z. and Auchettl, K. and Shappee, B. J. and Prieto, J. L. and Morrell, N. and Falco, E. and Strader, J. and Chomiuk, L. and Post, R. and Villanueva, S. and Mathur, S. and Dong, S. and Chen, P. and Bose, S.},
abstractNote = {In this work, we present the ultraviolet (UV) spectroscopic evolution of a tidal disruption event (TDE) for the first time. After the discovery of the nearby TDE iPTF16fnl, we obtained a series of observations with the Space Telescope Imaging Spectrograph (STIS) onboard the HubbleSpaceTelescope (HST). The dominant emission features closely resemble those seen in the UV spectra of the TDE ASASSN-14li and are also similar to those of N-rich quasars. There is evolution in the shape and central wavelength of the dominant emission features over the course of our observations, such that at early times the lines tend to be broad and redshifted, while at later times they are narrower and peak near the wavelengths of their atomic transitions. Like ASASSN-14li, but unlike N-rich quasars, iPTF16fnl shows neither Mg II 2798 Å nor C III] 1909 Å emission features. We also present optical photometry and spectroscopy, which suggest that the complex He II profiles observed in the optical spectra of many TDEs are in part due to the presence of N III and C III Wolf–Rayet features, which can potentially serve as probes of the far-UV when space-based observations are not possible. Finally, we use Swift X-ray Telescope and Ultraviolet/Optical Telescope (UVOT) observations to place strong limits on the X-ray emission and determine the characteristic temperature, radius and luminosity of the emitting material. Lastly, we find that iPTF16fnl is subluminous and evolves more rapidly than other optically discovered TDEs.},
doi = {10.1093/mnras/stx2372},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 473,
place = {United States},
year = {Fri Sep 22 00:00:00 EDT 2017},
month = {Fri Sep 22 00:00:00 EDT 2017}
}
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