| Title | Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz |
| Authors | Holoien, Thomas W-S Neustadt, Jack M. M. Vallely, Patrick J. Auchettl, Katie Hinkle, Jason T. Romero-Canizales, Cristina Shappee, Benjamin J. Kochanek, Christopher S. Stanek, K. Z. Chen, Ping Dong, Subo Prieto, Jose L. Thompson, Todd A. Brink, Thomas G. Filippenko, Alexei, V Zheng, WeiKang Bersier, David Bose, Subhash Burgasser, Adam J. Channa, Sanyum de Jaeger, Thomas Hestenes, Julia Im, Myungshin Jeffers, Benjamin Jun, Hyunsung D. Lansbury, George Post, Richard S. Ross, Timothy W. Stern, Daniel Tang, Kevin Tucker, Michael A. Valenti, Stefano Yunus, Sameen Zhang, Keto D. |
| Affiliation | Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, 191 W Woodruff Ave, Columbus, OH 43210 USA Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China Univ Diego Portales, Fac Ingenier & Ciencias, Nucleo Astron, Av Ejercito 441, Santiago, Chile Millennium Inst Astrophys, Santiago, Chile Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA Seoul Natl Univ, SNU Astron Res Ctr, Dept Phys & Astron, Astron Program, Seoul 08826, South Korea European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany Post Observ, Lexington, MA 02421 USA CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA Univ Calif Davis, Dept Phys & Astron, 1 Shields Ave, Davis, CA 95616 USA CALTECH, IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA |
| Keywords | TIDAL DISRUPTION EVENT ACTIVE GALACTIC NUCLEI BLACK-HOLE MASSES SUPERNOVA EXPLOSIONS SWIFT SKY EMISSION EVOLUTION TELESCOPE SPECTRA |
| Issue Date | 1-Jul-2022 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Abstract | We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object's evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSS J171955.84+414049.4 on UT 2017 July 27 at a redshift of z = 0.1641. The transient peaked at an absolute B-band magnitude of M ( B,peak) = -22.81, corresponding to a bolometric luminosity of L (bol,peak) = 8.3 x 10(44) erg s(-1), and exhibited late-time ultraviolet emission that was still ongoing in our latest observations. Integrating the full light curve gives a total emitted energy of E (tot) = (1.36 +/- 0.08) x 10(52) erg, with (0.80 +/- 0.02) x 10(52) erg of this emitted within 200 days of peak light. This late-time ultraviolet emission is accompanied by increasing X-ray emission that becomes softer as it brightens. ASASSN-17jz exhibited a large number of spectral emission lines most commonly seen in active galactic nuclei (AGNs) with little evidence of evolution. It also showed transient Balmer features, which became fainter and broader over time, and are still being detected >1000 days after peak brightness. We consider various physical scenarios for the origin of the transient, including supernovae (SNe), tidal disruption events, AGN outbursts, and ANTs. We find that the most likely explanation is that ASASSN-17jz was a SN IIn occurring in or near the disk of an existing AGN, and that the late-time emission is caused by the AGN transitioning to a more active state. |
| URI | http://hdl.handle.net/20.500.11897/649218 |
| ISSN | 0004-637X |
| DOI | 10.3847/1538-4357/ac74b9 |
| Indexed | SCI(E) |
| Appears in Collections: | 科维理天文与天体物理研究所 |
