| Title | K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova |
| Authors | Dimitriadis, G. Foley, R. J. Rest, A. Kasen, D. Piro, A. L. Polin, A. Jones, D. O. Villar, A. Narayan, G. Coulter, D. A. Kilpatrick, C. D. Pan, Y. -C. Rojas-Bravo, C. Fox, O. D. Jha, S. W. Nugent, P. E. Riess, A. G. Scolnic, D. Drout, M. R. Barentsen, G. Dotson, J. Gully-Santiago, M. Hedges, C. Cody, A. M. Barclay, T. Howell, S. Garnavich, P. Tucker, B. E. Shaya, E. Mushotzky, R. Olling, R. P. Margheim, S. Zenteno, A. Coughlin, J. Van Cleve, J. E. Vinicius de Miranda Cardoso, J. Larson, K. A. McCalmont-Everton, K. M. Peterson, C. A. Ross, S. E. Reedy, L. H. Osborne, D. McGinn, C. Kohnert, L. Migliorini, L. Wheaton, A. Spencer, B. Labonde, C. Castillo, G. Beerman, G. Steward, K. Hanley, M. Larsen, R. Gangopadhyay, R. Kloetzel, R. Weschler, T. Nystrom, V. Moffatt, J. Redick, M. Griest, K. Packard, M. Muszynski, M. Kampmeier, J. Bjella, R. Flynn, S. Elsaesser, B. Chambers, K. C. Flewelling, H. A. Huber, M. E. Magnier, E. A. Waters, C. Z. Schultz, A. S. B. Bulger, J. Lowe, T. B. Willman, M. Smartt, S. J. Smith, K. W. Points, S. Strampelli, G. M. Brimacombe, J. Chen, P. Munoz, J. A. Mutel, R. L. Shields, J. Vallely, P. J. Villanueva, S., Jr. Li, W. Wang, X. Zhang, J. Lin, H. Mo, J. Zhao, X. Sai, H. Zhang, X. Zhang, K. Zhang, T. Wang, L. Zhang, J. Baron, E. DerKacy, J. M. Li, L. Chen, Z. Xiang, D. Rui, L. Wang, L. Huang, F. Li, X. Hosseinzadeh, G. Howell, D. A. Arcavi, I. Hiramatsu, D. Burke, J. Valenti, S. Tonry, J. L. Denneau, L. Heinze, A. N. Weiland, H. Stalder, B. Vinko, J. Sarneczky, K. Pal, A. Bodi, A. Bognar, Zs. Csak, B. Cseh, B. Csornyei, G. Hanyecz, O. Ignacz, B. Kalup, Cs. Konyves-Toth, R. Kriskovics, L. Ordasi, A. Rajmon, I. Sodor, A. Szabo, R. Szakats, R. Zsidi, G. Williams, S. C. Nordin, J. Cartier, R. Frohmaier, C. Galbany, L. Gutierrez, C. P. Hook, I. Inserra, C. Smith, M. Sand, D. J. Andrews, J. E. Smith, N. Bilinski, C. |
| Affiliation | Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA State Univ New Jersey, Dept Phys & Astron, Rutgers, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA NASA, Ames Res Ctr, Moffett Field, CA 94035 USA Bay Area Environm Res Inst, POB 25, Moffett Field, CA 94035 USA NASA, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA Univ Maryland Baltimore Cty, 1000 Hilltop Circle, Baltimore, MD 21250 USA Univ Notre Dame, Dept Phys, 225 Nieuwland Sci Hall, Notre Dame, IN 46556 USA Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Canberra, ACT 2611, Australia Australian Natl Univ, Natl Ctr Publ Awareness Sci, Canberra, ACT 2611, Australia ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Bentley, WA, Australia Univ Maryland, Dept Astron, College Pk, MD 20742 USA Gemini Observ, La Serena, Chile Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile SETI Inst, 189 Bernardo Ave, Mountain View, CA 94043 USA Univ Fed Campina Grande, Campina Grande, Brazil Ball Aerosp & Technol Corp, Boulder, CO 80301 USA Univ Colorado, LASP, Boulder, CO 80303 USA Univ Hawaii, Inst Astron, 2680 Wood Lawn Dr, Honolulu, HI 96822 USA Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland Univ La Laguna, Calle Padre Herrera, E-38200 San Cristobal la Laguna, Spain Coral Towers Observ, Cairns, Qld 4870, Australia Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China Univ Valencia, Dept Astron & Astrofis, E-46100 Valencia, Spain Univ Valencia, Observ Astron, E-46980 Valencia, Spain Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China Las Cumbres Observ, 6740 Cortona Dr Ste 102, Goleta, CA 93117 USA Chinese Acad Sci, Yunnan Astron Observ China, Kunming 650011, Yunnan, Peoples R China Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China Tianjin Univ Technol, Sch Sci, Tianjin 300384, Peoples R China Univ Texas Austin, Dept Astron, Austin, TX 78712 USA Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China Chinese Acad Sci, South Amer Ctr Astron, China Chile Joint Ctr Astron, Camino El Observ 1515, Santiago, Chile Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, 4242 TAMU, College Stn, TX 77843 USA Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, Shanghai 200240, Peoples R China Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, IL-69978 Tel Aviv, Israel Univ Calif Davis, Dept Phys, 1 Shields Ave, Davis, CA 95616 USA LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA Konkoly Observ Budapest, MTA CSFK, Konkoly Thege M Ut 15-17, H-1121 Budapest, Hungary Univ Szeged, Dept Opt & Quantum Elect, Dom Ter 9, H-6720 Szeged, Hungary MTA CSFK, Lendulet Near Field Cosmol Res Grp, Budapest, Hungary Berzsenyi Daniel High Sch, Karpat Utca 49-53, H-1133 Budapest, Hungary Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England Univ Arizona, Steward Observ, 933 North Cherry Ave,Room N204, Tucson, AZ 85721 USA |
| Keywords | supernovae: general supernovae: individual (SN 2018oh) |
| Issue Date | 2019 |
| Publisher | ASTROPHYSICAL JOURNAL LETTERS |
| Abstract | We present an exquisite 30 minute cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering the moment of explosion and the subsequent rise, and continuing past peak brightness. These data are supplemented by multi-color Panoramic Survey Telescope (Pan-STARRS1) and Rapid Response System 1 and Cerro Tololo Inter-American Observatory 4 m Dark Energy Camera (CTIO 4-m DECam) observations obtained within hours of explosion. The K2 light curve has an unusual two-component shape, where the flux rises with a steep linear gradient for the first few days, followed by a quadratic rise as seen for typical supernovae (SNe). Ia. This "flux excess" relative to canonical SN. Ia behavior is confirmed in our i-band light curve, and furthermore, SN 2018oh is especially blue during the early epochs. The flux excess peaks 2.14 +/- 0.04 days after explosion, has a FWHM of 3.12 +/- 0.04 days, a blackbody temperature of T=17,500(-9,000)(+11,500) K, a peak luminosity of 4.3 +/- 0.2 x 10(37) erg s(-1), and a total integrated energy of 1.27 +/- 0.01 x 10(43) erg. We compare SN 2018oh to several models that may provide additional heating at early times, including collision with a companion and a shallow concentration of radioactive nickel. While all of these models generally reproduce the early K2 light curve shape, we slightly favor a companion interaction, at a distance of similar to 2x10(12) cm based on our early color measurements, although the exact distance depends on the uncertain viewing angle. Additional confirmation of a companion interaction in future modeling and observations of SN 2018oh would provide strong support for a single-degenerate progenitor system. |
| URI | http://hdl.handle.net/20.500.11897/552344 |
| ISSN | 2041-8205 |
| DOI | 10.3847/2041-8213/aaedb0 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 科维理天文与天体物理研究所 |
