K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova
G. DimitriadisDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAR. J. FoleyDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAA. RestDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USAD. KasenDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAAnthony L. PiroThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAA. PolinDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAD. O. JonesDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAV. Ashley VillarHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAGautham NarayanDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USAD. A. CoulterDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAC. D. KilpatrickDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAY. -C. PanDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAC. Rojas-BravoDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAOri D. FoxSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USASaurabh W. JhaDepartment of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854, USAP. NugentDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAA. G. RiessDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USAD. ScolnicKavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USAM. R. DroutThe Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAK2 Mission TeamGeert BarentsenBay Area Environmental Research Institute, P.O. Box 25, Moffett Field, CA 94035, USAJessie DotsonNASA Ames Research Center, Moffett Field, CA 94035, USAM. Gully-SantiagoBay Area Environmental Research Institute, P.O. Box 25, Moffett Field, CA 94035, USAChristina HedgesBay Area Environmental Research Institute, P.O. Box 25, Moffett Field, CA 94035, USAA. M. CodyBay Area Environmental Research Institute, P.O. Box 25, Moffett Field, CA 94035, USAThomas BarclayNASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USASteve B. HowellNASA Ames Research Center, Moffett Field, CA 94035, USAKEGSP. GarnavichDepartment of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670, USAB. TuckerNational Centre for the Public Awareness of Science, Australian National University, Canberra ACT 2611, AustraliaE. ShayaAstronomy Department, University of Maryland, College Park, MD 20742-2421, USAR. MushotzkyAstronomy Department, University of Maryland, College Park, MD 20742-2421, USAR. P. OllingAstronomy Department, University of Maryland, College Park, MD 20742-2421, USAS. MargheimGemini Observatory, La Serena, ChileA. ZentenoCerro Tololo Inter-American Observatory, Casilla 603, La Serena, ChileKepler spacecraft teamJ. CoughlinJ. E. Van CleveNASA Ames Research Center, Moffett Field, CA 94035, USAJ. Vinícius de Miranda CardosoNASA Ames Research Center, Moffett Field, CA 94035, USAK. A. LarsonK. M. McCalmont-EvertonC. A. PetersonS. E. RossL. H. ReedyLASP, University of Colorado at Boulder, Boulder, CO 80303, USAD. OsborneLASP, University of Colorado at Boulder, Boulder, CO 80303, USAC. McGinnLASP, University of Colorado at Boulder, Boulder, CO 80303, USAL. KohnertLASP, University of Colorado at Boulder, Boulder, CO 80303, USAL. MiglioriniLASP, University of Colorado at Boulder, Boulder, CO 80303, USAA. WheatonLASP, University of Colorado at Boulder, Boulder, CO 80303, USAB. SpencerLASP, University of Colorado at Boulder, Boulder, CO 80303, USAC. LabondeLASP, University of Colorado at Boulder, Boulder, CO 80303, USAG. CastilloLASP, University of Colorado at Boulder, Boulder, CO 80303, USAG. BeermanLASP, University of Colorado at Boulder, Boulder, CO 80303, USAK. StewardLASP, University of Colorado at Boulder, Boulder, CO 80303, USAM. HanleyLASP, University of Colorado at Boulder, Boulder, CO 80303, USAR. LarsenLASP, University of Colorado at Boulder, Boulder, CO 80303, USAR. GangopadhyayLASP, University of Colorado at Boulder, Boulder, CO 80303, USAR. KloetzelLASP, University of Colorado at Boulder, Boulder, CO 80303, USAT. WeschlerLASP, University of Colorado at Boulder, Boulder, CO 80303, USAV. NystromLASP, University of Colorado at Boulder, Boulder, CO 80303, USAJ. MoffattLASP, University of Colorado at Boulder, Boulder, CO 80303, USAM. RedickLASP, University of Colorado at Boulder, Boulder, CO 80303, USAK. GriestLASP, University of Colorado at Boulder, Boulder, CO 80303, USAM. PackardLASP, University of Colorado at Boulder, Boulder, CO 80303, USAM. MuszynskiLASP, University of Colorado at Boulder, Boulder, CO 80303, USAJ. KampmeierLASP, University of Colorado at Boulder, Boulder, CO 80303, USAR. BjellaLASP, University of Colorado at Boulder, Boulder, CO 80303, USAS. FlynnLASP, University of Colorado at Boulder, Boulder, CO 80303, USAB. ElsaesserLASP, University of Colorado at Boulder, Boulder, CO 80303, USAPan-STARRSK. C. ChambersInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAH. FlewellingInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAM. E. HuberInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAE. A. MagnierInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAC. Z. WatersInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAA. S. B. SchultzInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAJ. BulgerInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAT. B. LoweInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAM. WillmanInstitute of Astronomy, University of Hawaii, 2680 Wood- lawn Drive, Honolulu, HI 96822, USAStephen SmarttAstrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast, Belfast BT7 1NN, UKK. W. SmithAstrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast, Belfast BT7 1NN, UKDECamS. PointsCerro Tololo Inter-American Observatory, Casilla 603, La Serena, ChileG. M. StrampelliSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAASAS-SNJ. BrimacombeP. ChenKavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, People’s Republic of ChinaJ. A. MuñozDepartamento de Astronomía y Astrofísica, Universidad de Valencia, E-46100 Burjassot, Valencia, SpainR. L. MutelDepartment of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USAJ. ShieldsDepartment of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USAP. J. VallelyDepartment of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USAS. VillanuevaDepartment of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USAPTSS/TNTSW. LiLas Cumbres Observatory, 6740 Cortona Dr Ste 102, Goleta, CA 93117-5575, USAXiaofeng WangPhysics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing, 100084, People’s Republic of ChinaJujia ZhangCenter for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of ChinaH. LinPhysics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing, 100084, People’s Republic of ChinaJ. MoPhysics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing, 100084, People’s Republic of ChinaX. ZhaoSchool of Science, Tianjin University of Technology, Tianjin, 300384, People’s Republic of ChinaH. SaiPhysics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing, 100084, People’s Republic of China
2018en
ABI
Аннотация
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 K, a peak luminosity of , and a total integrated energy of . 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 ∼ 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.
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