ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003
Abstract
We present the discovery that ASASSN-14ko is a periodically flaring active galactic nucleus at the center of the galaxy ESO 253-G003. At the time of its discovery by the All-Sky Automated Survey for Supernovae (ASAS-SN), it was classified as a supernova close to the nucleus. The subsequent 6 yr ofV- andg-band ASAS-SN observations revealed that ASASSN-14ko has nuclear flares occurring at regular intervals. The 17 observed outbursts show evidence of a decreasing period over time, with a mean period ofP0= 114.2 ± 0.4 days and a period derivative of. The most recent outburst in 2020 May, which took place as predicted, exhibited spectroscopic changes during the rise and had a UV bright, blackbody spectral energy distribution similar to tidal disruption events (TDEs). The X-ray flux decreased by a factor of 4 at the beginning of the outburst and then returned to its quiescent flux after ~8 days. The Transiting Exoplanet Survey Satellite observed an outburst during Sectors 4–6, revealing a rise time of 5.60 ± 0.05 days in the optical and a decline that is best fit with an exponential model. We discuss several possible scenarios to explain ASASSN-14ko’s periodic outbursts, but currently favor a repeated partial TDE. The nextmore »
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[2];
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- NASA Fellow. University of Hawaii at Manoa, Honolulu, HI (United States). Institute for Astronomy
- University of Hawaii at Manoa, Honolulu, HI (United States). Institute for Astronomy
- NSF Graduate Research Fellow; The Ohio State Univ., Columbus, OH (United States). Department of Astronomy
- The Ohio State Univ., Columbus, OH (United States). Department of Astronomy and Center for Cosmology and AstroParticle Physics
- Carnegie Fellow. The Observatories of the Carnegie Institution for Science, Pasadena, CA (United States).
- The University of Melbourne, Parkville, VIC (Australia). School of Physics; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) (Australia); University of California, Santa Cruz, CA (United States). Department of Astronomy and Astrophysics; University of Copenhagen, Copenhagen, Denmark
- The Ohio State Univ., Columbus, OH (United States). Department of Astronomy and Center for Cosmology and AstroParticle Physicsf
- The Ohio State Univ., Columbus, OH (United States). Department of Astronomy
- The Ohio State Univ., Columbus, OH (United States). Department of Astronomy; The Ohio State Univ., Columbus, OH (United States). Department of Astronomy
- DOE CSGF Fellow. University of Hawaii at Manoa, Honolulu, HI (United States). Institute for Astronomy
- University of Hawai`i, Pukalani, HI (United States). Institute for Astronomy
- Coral Towers Observatory, Cairns (Australia)
- Dogsheaven Observatory, Brasilia, Brazil (South America).
- Moondyne Observatory, Bakers Hill, Western Australia, Australia (Europe)
- Massachusetts Institute of Technology, Cambridge, MA (United States). Department of Physics, and Kavli Institute for Astrophysics and Space Research
- Morehead State University, Morehead, KY (United States). Department of Physics, Earth Science, and Space System Engineering
- Center for Backyard Astrophysics Pretoria, South Africa (Africa); Bronberg Observatory and Kleinkaroo Observatory
- Universidad Diego Portales, Santiago, Chile (South Africa). Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias; Millennium Institute of Astrophysics, Santiago, Chile (South Africa)
- Naval Observatory, Flagstaff, AZ (United States); George Mason University, Fairfax, VA (United States). Department of Physics and Astronomy
- Earth and Planets Laboratory, Washington, DC (United States). Carnegie Institution for Science
- Publication Date:
- Research Org.:
- Krell Institute, Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1853058
- Grant/Contract Number:
- SC0019323
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 910; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Astronomy & Astrophysics
Citation Formats
Payne, Anna V., Shappee, Benjamin J., Hinkle, Jason T., Vallely, Patrick J., Kochanek, Christopher S., Holoien, Thomas W. -S., Auchettl, Katie, Stanek, K. Z., Thompson, Todd A., Neustadt, Jack M. M., Tucker, Michael A., Armstrong, James D., Brimacombe, Joseph, Cacella, Paulo, Cornect, Robert, Denneau, Larry, Fausnaugh, Michael M., Flewelling, Heather, Grupe, Dirk, Heinze, A. N., Lopez, Laura A., Monard, Berto, Prieto, Jose L., Schneider, Adam C., Sheppard, Scott S., Tonry, John L., and Weiland, Henry. ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003. United States: N. p., 2021.
Web. doi:10.3847/1538-4357/abe38d.
Payne, Anna V., Shappee, Benjamin J., Hinkle, Jason T., Vallely, Patrick J., Kochanek, Christopher S., Holoien, Thomas W. -S., Auchettl, Katie, Stanek, K. Z., Thompson, Todd A., Neustadt, Jack M. M., Tucker, Michael A., Armstrong, James D., Brimacombe, Joseph, Cacella, Paulo, Cornect, Robert, Denneau, Larry, Fausnaugh, Michael M., Flewelling, Heather, Grupe, Dirk, Heinze, A. N., Lopez, Laura A., Monard, Berto, Prieto, Jose L., Schneider, Adam C., Sheppard, Scott S., Tonry, John L., & Weiland, Henry. ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003. United States. https://doi.org/10.3847/1538-4357/abe38d
Payne, Anna V., Shappee, Benjamin J., Hinkle, Jason T., Vallely, Patrick J., Kochanek, Christopher S., Holoien, Thomas W. -S., Auchettl, Katie, Stanek, K. Z., Thompson, Todd A., Neustadt, Jack M. M., Tucker, Michael A., Armstrong, James D., Brimacombe, Joseph, Cacella, Paulo, Cornect, Robert, Denneau, Larry, Fausnaugh, Michael M., Flewelling, Heather, Grupe, Dirk, Heinze, A. N., Lopez, Laura A., Monard, Berto, Prieto, Jose L., Schneider, Adam C., Sheppard, Scott S., Tonry, John L., and Weiland, Henry. Thu .
"ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003". United States. https://doi.org/10.3847/1538-4357/abe38d. https://www.osti.gov/servlets/purl/1853058.
@article{osti_1853058,
title = {ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003},
author = {Payne, Anna V. and Shappee, Benjamin J. and Hinkle, Jason T. and Vallely, Patrick J. and Kochanek, Christopher S. and Holoien, Thomas W. -S. and Auchettl, Katie and Stanek, K. Z. and Thompson, Todd A. and Neustadt, Jack M. M. and Tucker, Michael A. and Armstrong, James D. and Brimacombe, Joseph and Cacella, Paulo and Cornect, Robert and Denneau, Larry and Fausnaugh, Michael M. and Flewelling, Heather and Grupe, Dirk and Heinze, A. N. and Lopez, Laura A. and Monard, Berto and Prieto, Jose L. and Schneider, Adam C. and Sheppard, Scott S. and Tonry, John L. and Weiland, Henry},
abstractNote = {We present the discovery that ASASSN-14ko is a periodically flaring active galactic nucleus at the center of the galaxy ESO 253-G003. At the time of its discovery by the All-Sky Automated Survey for Supernovae (ASAS-SN), it was classified as a supernova close to the nucleus. The subsequent 6 yr ofV- andg-band ASAS-SN observations revealed that ASASSN-14ko has nuclear flares occurring at regular intervals. The 17 observed outbursts show evidence of a decreasing period over time, with a mean period ofP0= 114.2 ± 0.4 days and a period derivative of. The most recent outburst in 2020 May, which took place as predicted, exhibited spectroscopic changes during the rise and had a UV bright, blackbody spectral energy distribution similar to tidal disruption events (TDEs). The X-ray flux decreased by a factor of 4 at the beginning of the outburst and then returned to its quiescent flux after ~8 days. The Transiting Exoplanet Survey Satellite observed an outburst during Sectors 4–6, revealing a rise time of 5.60 ± 0.05 days in the optical and a decline that is best fit with an exponential model. We discuss several possible scenarios to explain ASASSN-14ko’s periodic outbursts, but currently favor a repeated partial TDE. The next outbursts should peak in the optical on UT 2020 September 7.4±1.1 and UT 2020 December 26.5±1.4.},
doi = {10.3847/1538-4357/abe38d},
journal = {The Astrophysical Journal},
number = 2,
volume = 910,
place = {United States},
year = {Thu Apr 01 00:00:00 EDT 2021},
month = {Thu Apr 01 00:00:00 EDT 2021}
}
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