{ "id": "J/ApJ/910/125", "title_cds": "Follow-up photometry of ASASSN-14ko", "title_create": "Payne+, 2021", "year": "2021", "author": "Payne A.V., Shappee B.J., Hinkle J.T., Vallely P.J., Kochanek C.S.,Holoien T.W.-S., Auchettl K., Stanek K.Z., Thompson T.A., Neustadt J.M.M.,Tucker M.A., Armstrong J.D., Brimacombe J., Cacella P., Cornect R.,Denneau L., Fausnaugh M.M., Flewelling H., Grupe D., Heinze A.N.,Lopez L.A., Monard B., Prieto J.L., Schneider A.C., Sheppard S.S.,Tonry J.L., Weiland H.", "title_pub": " ASASSN-14ko is a periodic nuclear transient in ESO 253-G003.", "first_author": "Payne A.V.", "bibcode": [ "2021ApJ...910..125P" ], "ref_biblio": [ "" ], "keyword_cds": [ "Galaxies, Seyfert", "Photometry, ultraviolet", "Photometry, UBVRI", "X-ray sources", "Surveys", "Active gal. nuclei" ], "keyword_pub": "Black hole physics ; Galaxies ; Seyfert galaxies ; Galaxy accretion disks", "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 6yr of V- and g-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 of P_0_=114.2+/-0.4days and a", "period derivative of dP/dt=-0.0017+/-0.0003. 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 ~8days. The Transiting Exoplanet", "Survey Satellite observed an outburst during Sectors 4-6, revealing a", "rise time of 5.60+/-0.05days 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." ], "description": [ "On 2014 November at 14.28 UT, the All-Sky Automated Survey for", "SuperNovae (ASAS-SN; Shappee+ 2014, J/ApJ/788/48 ;", "Kochanek+ 2017PASP..129j4502K) triggered on a nuclear transient", "associated with ESO 253-G003 at V~17.0mag and reported it as", "ASASSN-14ko (Holoien+ 2014ATel.6732....1H & 2017, J/MNRAS/464/2672).", "", "UltraViolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT)", "observations by the Neil Gehrels Swift Observatory were taken on UT", "2014 November 16, 19, 21, 23, and 27 (PI: T. W.-S. Holoien,", "ToO ID: 33529).", "We again requested Swift data (ToO IDs: 13836, 13979, 14005) to", "monitor ASASSN-14ko during quiescence and then during the outburst", "predicted for UT 2020 May 18.5.", "There are three additional observations of ESO 253-G003 in the Swift", "data archive under the identification SWIFT J0525.3-600", "(Obs ID: 37354, PI: C.B. Markwardt).", "See Section 2.2 and 2.8.", "", "As part of ongoing work to examine the long-term behavior of AGNs", "observed by ASAS-SN, a full light curve of ESO 253-G003 was extracted", "in 2020 February. The complete V- and g-band light curve 2014-2020", "is shown in Figure 1.", "ASAS-SN is a network of 20 robotic telescopes hosted by the Las", "Cumbres Observatory Global Telescope (LCOGT) at five sites around the", "globe. See Section 2.1.", "", "The Asteroid Terrestrial-impact Last Alert System (ATLAS survey;", "Tonry+ 2018PASP..130f4505T) consists of two 0.5m f/2 Wright Schmidt", "telescopes on Haleakala and at the Mauna Loa Observatory. Designed", "primarily for detecting hazardous asteroids, the telescopes obtain", "four 30s exposures of 200-250 fields per night. ATLAS uses two", "broadband filters, the \"cyan\" (c) filter covering 420-650nm and the", "\"orange\" (o) filter covering 560-820nm. We performed forced photometry", "on the subtracted ATLAS images of ASASSN-14ko. See Section 2.3.", "", "ASASSN-14ko was observed by the Transiting Exoplanet Survey Satellite", "(TESS) during Sectors 4-6, which occurred between 2018 October 18 and", "2019 January 7. TESS observes in a single broadband filter, spanning", "roughly 6000-10000{AA} with an effective wavelength of ~7500{AA}. TESS", "magnitudes are calibrated to the Vega system. See Section 2.4.", "", "We obtained photometric observations from the LCOGT. The B-, V-, g',", "r', and i'-band observations were taken using the 1m telescope at", "Siding Spring Observatory in New South Wales, Australia. The LCOGT", "photometric observations began on 2020 April 13 in quiescence and", "continued through the midpoint of the 2020 May outburst.", "See Section 2.5.", "", "Amateur astronomers at four different observatories observed", "ASASSN-14ko starting shortly after it was discovered to be", "periodically flaring. Data were taken at the Moondyne Observatory,", "east of Perth, Australia, using a 0.4m telescope with AOX adaptive", "optics between 2020 April 28 and June 8 and on a daily cadence between", "2020 May 10 and 28. B_C_-, V-, G_S_-, R_S_-, and I_C_-band images were", "obtained with guided 120s exposures.", "Data were also collected using a 41 cm telescope at Savannah Skies", "Observatory from Queensland, Australia.", "ASASSN-14ko was observed from Bronberg Observatory in South Africa", "using 14- and 12-inch telescopes in the R band with 15s exposures.", "Finally, ASASSN-14ko was observed from Dogsheaven Observatory in", "Brazil. See Section 2.6.", "", "We also obtained seven spectra with the LCOGT Folded Low Order", "whYte-pupil Double-dispersed Spectrograph (FLOYDS) at the robotic 2m", "Faulkes Telescope South located at Siding Spring Observatory. These", "observations were taken on 2020 April 12, 15, 24, 25, 27, 2020 May 16,", "and 2020 May 17. See Section 2.7." ], "object": [ "05 25 18.13 -46 00 20.3 ASASSN-14ko = ASASSN -14ko" ], "curator": "Prepared by [AAS], Emmanuelle Perret [CDS]", "history": [ "From electronic version of the journal" ], "see_also": [ "VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)", "J/ApJS/132/37 : Spectroscopy of Southern warm IR galaxies (Kewley+, 2001)", "J/ApJ/560/566 : K-band galaxy LF from 2MASS (Kochanek+, 2001)", "J/ApJ/676/944 : GALEX & CFHTLS cand. tidal disruption events (Gezari+, 2008)", "J/ApJ/687/1201 : SN and LGRB locations in their host galaxies (Kelly+, 2008)", "J/A+A/480/611 : XMM-Newton slew survey catalogue, XMMSL1 (Saxton+, 2008)", "J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)", "J/ApJS/207/19 : Hard X-ray survey from Swift-BAT 6yrs (Baumgartner+, 2013)", "J/ApJ/793/38 : Palomar Transient Factory photometric obs. (Arcavi+, 2014)", "J/ApJS/210/3 : SDSS bulge, disk & stellar mass estimates (Mendel+, 2014)", "J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)", "J/MNRAS/453/1562 : CRTS close supermassive black hole binaries (Graham+, 2015)", "J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (Sullivan+, 2015)", "J/ApJ/821/56 : Space telescope RM project. III. NGC5548 (Fausnaugh+, 2016)", "J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)", "J/MNRAS/463/3813 : ASASSN-15oi UBVI M2W1W2 light curves (Holoien+, 2016)", "J/MNRAS/455/2918 : Phot. & line luminosities for ASASSN-14li (Holoien+, 2016)", "J/MNRAS/464/2672 : ASAS-SN bright supernova catalog 2013-2014 (Holoien+, 2017)", "J/ApJ/836/99 : NuSTAR serendipitous survey: 40-month cat. (Lansbury+, 2017)", "J/ApJ/880/120 : Phot. of the tidal disruption event PS18kh (Holoien+, 2019)", "J/ApJ/883/111 : UV-Opt LCs of ASASSN-19bt detected by TESS (Holoien+, 2019)", "J/ApJ/883/94 : Optical & UV follow-up of 1ES 1927+654 (Trakhtenbrot+, 2019)", "J/ApJ/898/161 : 500days of ASASSN-18pg multiwavelength obs. (Holoien+, 2020)", "J/ApJ/908/51 : TESS early LCs of type Ia Supernovae (Fausnaugh+, 2021)" ], "tables": [ { "name": "table1.dat", "desc": "Photometry of ASASSN-14ko used in this analysis" } ], "archive_date_creation": "10-Oct-2022", "authors_details": [ { "name": "Payne A.V", "firstname": "Anna V.", "lastname": "Payne", "orcid": "0000-0003-3490-3243", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Shappee B.J", "firstname": "Benjamin J.", "lastname": "Shappee", "orcid": "0000-0003-4631-1149", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Hinkle J.T", "firstname": "Jason T.", "lastname": "Hinkle", "orcid": "0000-0001-9668-2920", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Vallely P.J", "firstname": "Patrick J.", "lastname": "Vallely", "orcid": "0000-0001-5661-7155", "affiliations": [ "Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA" ] }, { "name": "Kochanek C.S", "firstname": "Christopher S.", "lastname": "Kochanek", "orcid": "0000-0001-6017-2961", "affiliations": [ "Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA", "Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA" ] }, { "name": "Holoien T.W.-", "firstname": "Thomas W.-S.", "lastname": "Holoien", "orcid": "0000-0001-9206-3460", "affiliations": [ "The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA" ] }, { "name": "Auchettl K", "firstname": "Katie", "lastname": "Auchettl", "orcid": "0000-0002-4449-9152", "affiliations": [ "School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia", "ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia", "Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA", "DARK, Niels Bohr Institute, University of Copenhagen, Lyngbyvej 2, DK-2100 Copenhagen, Denmark" ] }, { "name": "Stanek K.Z", "firstname": "K. Z.", "lastname": "Stanek", "affiliations": [ "Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA", "Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA" ] }, { "name": "Thompson T.A", "firstname": "Todd A.", "lastname": "Thompson", "orcid": "0000-0003-2377-9574", "affiliations": [ "Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA", "Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA" ] }, { "name": "Neustadt J.M.M", "firstname": "Jack M. M.", "lastname": "Neustadt", "orcid": "0000-0001-7351-2531", "affiliations": [ "Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA" ] }, { "name": "Tucker M.A", "firstname": "Michael A.", "lastname": "Tucker", "orcid": "0000-0002-2471-8442", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Armstrong J.D", "firstname": "James D.", "lastname": "Armstrong", "affiliations": [ "Institute for Astronomy, University of Hawai`i, 34 Ohia Ku Street, Pukalani, HI 96768, USA" ] }, { "name": "Brimacombe J", "firstname": "Joseph", "lastname": "Brimacombe", "affiliations": [ "Coral Towers Observatory, Cairns, QLD 4870, Australia" ] }, { "name": "Cacella P", "firstname": "Paulo", "lastname": "Cacella", "orcid": "0000-0002-3546-3190", "affiliations": [ "Dogsheaven Observatory, SMPW Q25CJ1 LT10B, Brasilia, Brazil" ] }, { "name": "Cornect R", "firstname": "Robert", "lastname": "Cornect", "affiliations": [ "Moondyne Observatory, Bakers Hill, Western Australia, Australia" ] }, { "name": "Denneau L", "firstname": "Larry", "lastname": "Denneau", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Fausnaugh M.M", "firstname": "Michael M.", "lastname": "Fausnaugh", "orcid": "0000-0002-9113-7162", "affiliations": [ "Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA" ] }, { "name": "Flewelling H", "firstname": "Heather", "lastname": "Flewelling", "orcid": "0000-0002-1050-4056", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Grupe D", "firstname": "Dirk", "lastname": "Grupe", "orcid": "0000-0002-9961-3661", "affiliations": [ "Department of Physics, Earth Science, and Space System Engineering, Morehead State University, 235 Martindale Drive, Morehead, KY 40351, USA" ] }, { "name": "Heinze A.N", "firstname": "A. N.", "lastname": "Heinze", "orcid": "0000-0003-3313-4921", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Lopez L.A", "firstname": "Laura A.", "lastname": "Lopez", "orcid": "0000-0002-1790-3148", "affiliations": [ "Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA", "Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA" ] }, { "name": "Monard B", "firstname": "Berto", "lastname": "Monard", "affiliations": [ "Bronberg Observatory, Center for Backyard Astrophysics Pretoria, PO Box 11426, Tiegerpoort 0056, South Africa; Kleinkaroo Observatory, Center for Backyard Astrophysics Kleinkaroo, Sint Helena 1B, P.O. Box 281, Calitzdorp 6660, South Africa" ] }, { "name": "Prieto J.L", "firstname": "Jose L.", "lastname": "Prieto", "orcid": "0000-0003-0943-0026", "affiliations": [ "N\u00facleo de Astronom\u00eda de la Facultad de Ingenier\u00eda y Ciencias, Universidad Diego Portales, Av. Ej\u00e9rcito 441, Santiago, Chile", "Millennium Institute of Astrophysics, Santiago, Chile" ] }, { "name": "Schneider A.C", "firstname": "Adam C.", "lastname": "Schneider", "orcid": "0000-0002-6294-5937", "affiliations": [ "US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002, USA", "Department of Physics and Astronomy, George Mason University, MS3F3, 4400 University Drive, Fairfax, VA 22030, USA" ] }, { "name": "Sheppard S.S", "firstname": "Scott S.", "lastname": "Sheppard", "orcid": "0000-0003-3145-8682", "affiliations": [ "Carnegie Institution for Science, Earth and Planets Laboratory, 5241 Broad Branch Road, Washington, DC 20015, USA" ] }, { "name": "Tonry J.L", "firstname": "John L.", "lastname": "Tonry", "orcid": "0000-0003-2858-9657", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] }, { "name": "Weiland H", "firstname": "Henry", "lastname": "Weiland", "affiliations": [ "Institute for Astronomy, University of Hawai`i at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA;" ] } ], "catid": 19100125, "vizier_date_update": "25-Nov-2022", "doi_pub": [ "10.3847/1538-4357/abe38d" ], "orcid_pub": [ "0000-0003-3490-3243" ], "doi_cds": "10.26093/cds/vizier.19100125", "type": [ "OC" ], "archive_date_update": "25-Nov-2022", "uat": [ "Seyfert galaxies", "Ultraviolet photometry", "Infrared photometry", "Optical astronomy", "Broad band photometry", "X-ray sources", "Surveys", "Active galactic nuclei" ], "ip_addr": "216.73.216.164", "data_access": "v-f" }